boss ch1 super chorus manual
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boss ch1 super chorus manualThe easiest way to determine which version you have is to use the serial number. This also mean that all digital CH-1s will have a dark gray label. Trademarks and Copyrights are property of their respective owners. Login Registration is disabled. We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it. Ok. Even if chocolate chip is on your mind, our cookies make an important contribution to a great shopping experience. They help us to show you relevant offers, remember your settings to ease navigation on our website and alert us when the website is slow or unstable. You can view and manage further details and options here.Always with customised added value for musicians. Close Service Contact us Help The effects unit sounds highly convincing in mono, but plug in a second amp to Output B and the sun will truly rise. A truly broad stereo sound, shimmering in the treble, makes most clean sounds (among others) much more effective. Of these, 295 customers have written no texts or given their feedback in another language. 4 98 Customers 98 customers have given this product a 4-star rating. Of these, 96 customers have written no texts or given their feedback in another language. 3 11 Customers 11 customers have given this product a 3-star rating. Of these, 10 customers have written no texts or given their feedback in another language. 2 4 Customers 4 customers have given this product a 2-star rating. CH-1 is a very smooth and clean sounding chorus effect, that compliments any clean guitar signal beautifully (always works great on overdrive). It works great in mono, but also has a stereo output - stereo chorus is always cool. The CH-1 also includes an additional function in an EQ knob, which can give give a really strong, bright and shimmery chorus sound, whilst boosting the depth at the same time can create a sound verging on the edge of vibrato.http://www.kmbb.at/userfiles/bose-radio-cd-player-instruction-manual.xml
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The CH-1 is an excellent chorus pedal, offering a flexible modulation which is easy to use. There are many chorus pedals on the market, many with more features, but the CH-1 sounds great and can hold it's own amongst it's competition. Send report Total handling features sound quality State of the Art der penny, 24.02.2014 I bought the Boss CH-1 chorus pedal, because I was looking for a chorus effect for my clean guitar sound. Fast delivery by Thomann, perfect as usual. The pedal is built like a tank, easy to use and it brings exactly this chorus effect, you have heard on so many recordings or live performances. This pedal is jused by a lot of professional musicans on their effect board for years. The pedal also works very well on your bass pedalboard. So, I have two of them. One for my guitarrig and one for my bassrig. In my opinion, this pedal is state of the art, for years. Send report Total handling features sound quality Great chorus pedal Dub77, 09.06.2020 This is a solid built and great chorus pedal, however, I already own the boss Ce5 chorus Ensemble pedal which is far superior. If you are looking for a chorus pedal, i strongly recommend that you get the CE5 over this as the CE5 allows you choose to put emphasis over bass or treble, and gives the ability to blend these tones. Pros. solid chorus pedal with good tone Cons. Send report Total handling features sound quality Gurteen, 13.03.2019 Good quality chorus pedal. Send report Read all 155 reviews Rate product Standard Delivery Times. Get Details Learn More (Opens in new window) Learn More (Opens in new window) Learn More (Opens in new window) Learn More (Opens in new window) Learn More (Opens in new window) Learn More (Opens in new window) Learn More (Opens in new window) Click To Read More About This Product Some exclusions apply. Questions?http://www.aynispirit.nl/userfiles/bose-radio-alarm-manual.xml CallThe CH-1 SUPER Chorus delivers a clean, classic sound with crystal-clear highs and a unique stereo effect, variable between left and right speakers if you use the stereo outputs. Effect Level, EQ, Rate, and Depth knobs give you complete control over this industry-standard chorus effect. All Rights Reserved. Publisher does not accept liability for incorrect spelling, printing errors (including prices), incorrect manufacturer's specifications or changes, or grammatical inaccuracies in any product included in the Musician's Friend catalog or website. Prices subject to change without notice. He does this, as it splits t. more Since its debut in 1989, the Bo. more FANTASTIC for clean stuff or a Rush-esque overdrive sound. I find it hard to get different styles of effect out of it. If your after a good sounding more subtle chorus for mostly overdrive tones then this is a good choice but if you're after something like a deep 80s sounding clean tone chorus then id say theres probably better options out there. I will say its lasted me countless gigs and in typical boss fashion it can really take a beating. Its really one of the best Chorus effects what I?ve ever seen. Its very interesting that this wonderful effect costs just something around 100 dollars. This fact I find very important and nice. I use this effect in my pedalboard and I am really satisfied. It gives a really really cool sound, and it's boss built, so it will surely live longer than me. I did replace it though with my Waza which is better. Effect Level, EQ, Rate, and Depth knobs give you complete control over this industry-standard chorus effect. Something went wrong. Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. We are here to help.https://ayurvedia.ch/4-manual-hauptwerk-console To provide the musicians with an option to control the desired aspects of their instrument's tone, this Stompbox unit is equipped with the following controls: e.level knob, EQ knob, rate knob, depth knob. The CH1 works well, I am still learning how to get the right sounds for various songs. In all respects It is exactly what I wanted despite the fact that it is well made. Having used other combination effects pedals in the past I can honestly say this pedal being a single effect allows me greater control and its through put to the amplifier gives me a crisp clean sound that allows the full character of my guitar to come through. If you are simply after a chorus effects pedal, I highly recommend you buy one of these.Cancel Thanks, we'll look into this. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. This may happen as a result of the following: Javascript is disabled or blocked by an extension (ad blockers for example) Your browser does not support cookies Please make sure that Javascript and cookies are enabled on your browser and that you are not blocking them from loading. Go to next slide - Make an offer Fresh Deals this Way Find what you’re looking for, for even less. Sell on eBay Sell Chorus User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Please try again.Wednesday, Aug 19No Cost EMI availableNo customer signatures are required at the time of delivery. To pay by cash, place cash on top of the delivery box and step back. Order delivery tracking to your doorstep is available.Show details Sold by Panoply Digital and ships from Amazon Fulfillment. This item Delivered FREE in India with Super Saver Delivery. Details Boss BCB-60 Pedal Board ? 12,160.00 Only 2 left in stock.http://www.atlantarepairtv.com/images/boss-ch1-super-chorus-manual.pdf Sold by Panoply Digital and ships from Amazon Fulfillment. This item Delivered FREE in India with Super Saver Delivery. Details Check your eligibility here Flat 3 BACK for non-Prime members.Get credit up to ?1,00,000. Check eligibility here Sign up for free Page 1 of 1 Start over Page 1 of 1 In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Please try your search again later.You can edit your question or post anyway.You can use the pedal's four controls - effect level, EQ, rate, and depth - to sculpt the feel and dimension of your sound until it's just right. The BOSS CH-1 can take you everywhere from shimmering clean tones to lush ambiences to boat-rocking, dizzying swirls.Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness. Please try again later. M K Park 5.0 out of 5 stars Have tried cheaper alternative chorus pedals but none of them a patch on the Boss CH-1. If you like The Smiths, Pretenders, Ryan Adams then this is the one for you.Sorry, we failed to record your vote. Please try again Sorry, we failed to record your vote. Please try again I recommend this pedal.Sorry, we failed to record your vote. Please try again. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Used: Very GoodSomething we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime. Learn more about the program. Please try again.Please try again.In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading.http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1626d9301baf78---3rac-leds-manual.pdf Page 1 of 1 Start over Page 1 of 1 In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Register a free business account Please try your search again later.Effect Level, EQ, Rate and Depth knobs allow for precise shaping of sound.Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness. Please try again later. Michael 5.0 out of 5 stars I use it inline with the boss blues driver. I have the chorus effects set below 12 o'clock. It takes the twangy steel sound out of the strings so it is left with just the bright, soft, single coil sound, plus a little chorus effect.Make sure if you use the daisy chain AC adapter to put the Chorus pedal downstream of a higher gain pedal like a SD-1 (Super Overdrive) or BD-2 (Blues Driver) otherwise you'll needlessly be thinking it's not working and try to file a warranty claim or misguidedly write a negative Amazon review. BOSS chorus pedals make you sound like you're a better guitar player than you actually are because the 80's rule.It gives my a guitar a fuller sound. Just one of many Boss pedals that I own!As a Johnny Marr (The Smiths) fan, I am able to get similar sounds using this pedal and Marr used a lot of Boss pedals.Have tried cheaper alternative chorus pedals but none of them a patch on the Boss CH-1. If you like The Smiths, Pretenders, Ryan Adams then this is the one for you.Sorry, we failed to record your vote. Items must be returned in original, as-shipped condition with all original packaging.Please check the fields highlighted in red. You can output in mono by using just Output A but the option is always there to go stereo.5percent-design-action.com/upload/users/files/connecticut-stormwater-quality-manual.pdf This will include a text or email on the day of delivery giving you an exact hour window of when your gear will be with you, and the drivers name - just so you know when to turn the volume down. Orders under ?99: ?4.99 Delivery Charge at CheckoutThe Boss CH-1 Super Chorus pedal gives you a classic, clean chorus sound with beautifully clear highs and an incredible stereo effect. You can output in mono by using just Output A but the option is always there to go stereo. Points are worth a 1p discount for every point you redeem.We display the number of points available for a product on the product's page on our website. Normally we'll give you one point for every pound you spend, but watch out for double and triple points deals for even more savings! For Store opening times and COVID restrictions, please click here before you visit. This lets you create any kind of chorus effect from a mild, natural chorus to the clear and penetrating stereo chorus effect popular in contemporary music. An EQ function adjusts the tonality of the chorus sound. Boss pedals are renowned for quality and value and the CH-1 has been an industry favourite for over 20 years. When you increase the depth, it increases the intensity of the effect. When you adjust the rate (or delay time) it makes the repeats occur closer together or farther apart. You can be sure that however much you drop it, kick it, throw it and jump on it, it'll still come back for more. These pedals constantly survive the rigours of rock 'n' roll touring, and that's why they're seen at the feet of top touring pros everywhere. Boss are so sure their compact pedals last the test of time, they cover them with a full five year warranty. You can then choose which finance term you'd like to apply for, and change your deposit if you wish. This is where your finance application is processed. Assuming your application is accepted you'll be able to place your deposit and confirm your order right there.http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1626d931a648e3---3r60-knee-manual.pdf Get approval before 3pm and we'll send your order out the same working day (stock permitting) for next working day delivery! Andertons Music Co. acts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Andertons Music Co. is authorised and regulated by the Financial Conduct Authority. Credit provided subject to age and status. I bought this as I wanted to create an authentic African guitar sound - get the settings right and it works really really well.As you'd expect from BossAdd a little more of rate and voila - you get a great 80's lead tone. And of course built like a tank!Ok battery life but simple to use and very affordable.I do get annoyed that boss never gives a power supply.That’s why we want to make it as quick and easy as possible for you to get your order, safe and sound! Click the button below to read more. That’s why we want to make it as quick and easy as possible for you to get your order, safe and sound! Click the button below to read more. No delivery charges. Over the years Boss have made many different chorus effects, but the CH-1 is the most long-standing, having remained in constant production since its introduction back in ’89. Compared to Boss’ more famous Chorus Ensemble pedals - with the CE-5 and CE-2w being the current models - the CH-1 has a completely different character. Where the CE-5 and CE-2w are perhaps at their best when used to create swirly thickness in your tone, the CH-1 gives you an edgier effect that’s great for lead work. And the CH-1 has found legions of devotees for this very reason, with the amazing Joe Satriani included in the worldwide army of CH-1 fans. The CH-1 Super Chorus also has a wider frequency range when compared to its Boss Chorus Ensemble stablemates, and a simpler EQ section when compared to the BOSS CE-5. This single EQ control is essentially an overall chorus effect tone control that dials back the CH-1’s edgy nature.https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1626d932bf1293---3racing-winch-manual.pdf GAK’s Boss CH-1 Super Chorus FAQs: Q1: Is the CH-1 true bypass? A: No. Although there's a lot of true bypass hype these days, neither true nor buffered bypass are objectively better than one another. On account of a buffer’s ability to drive long cable runs and provide silent switching Boss remain resolutely in the buffered camp.A: Whilst Boss have produced many different chorus pedals over the years, the CH-1 is something of a standalone pedal in their chorus range. In general we recommend the CH-1 for players looking for an all-purpose chorus that can be used subtly to thicken things up, or more aggressively to add a modern shimmer to both clean and driven tones. We recommend the CE-5 and CE-2w to players looking to add that classic Boss chorus swirl. Q3: Why does the CH-1 have two outputs and how do I use them. A: The CH-1 has dual outputs so this pedal can be used in stereo. While it sounds great in mono (Output A alone), plugging Output B into a second amp increases the depth of the effect and vastly increases the breadth of your guitar tone. Although we admit that carrying two amps to gigs is pretty impractical, we definitely recommend trying this out for yourself. Q4: Is this pedal Made in Japan (MIJ)? A: No. Although Japanese made Boss pedals are much lusted after, the CH-1 was introduced after production moved to Taiwan. The current range of Boss pedals retains the quality of the earlier Japanese Production, but at much more competitive pricing than Japanese production would allow. As long as the pedal's registered after purchase Boss provide a full five-year warranty for all compact pedals and Boss pedals are generally regarded as the most reliable pedals available. Q5: Is this an analogue chorus pedal. A: Since October 2001 all CH-1s produced have been digital. You can purchase by clicking here. Finance is subject to status, terms and conditions apply.Registered office: 30 - 34 North Street Hailsham East Sussex BN27 1DW GAK.CO.5571818.com/userfiles/files/connecticut-stormwater-quality-manual-2004.pdfUK LTDThe Guitar Amp and Keyboard Centre Limited FCA registration number is 684977. Credit provided subject to age and statusRegistered in England and Wales 4585692. Registered office: One Arleston Way, Solihull, B90 4LH. Authorised and regulated by the Financial Conduct Authority. Our FCA reference number is 679653.After reviewing a number of chorus pedals on line, I picked this one and I am not disappointed. Dj Equipment.Yamaha, Line 6, Ibanez, Boss, Alesis, Peavey. Made in taiwan, november 2001. I had tons of effect pedals, but zero Boss brand choruses. That felt extremely weird, as these effects in Boss catalog are usually praised pedals. So what was i to do, bet to get me some. First i scored a CE-3 stereo chorus through auction site listing (i’ve talked about that unit earlier on.) and second, i grabbed this one as used from around here. As usual, i checked the serial number against the Bossarea decoder and checked some facts about the design as well. What do you know. Just my luck. This unit is one of the very first CH-1s to exit the factory with newly revamped SMD board inside. Just a month older, and it would have been the one with a pink label and a MN3007 as a powering BBD. But then again. We have DD-2 and DD-3 delays which have the exact same circuit inside, but for some reason the model number was changed.We do know that DDBs come in surface mount packaging too. And the long chip could be a CMOS chip to handle the electronic switching. But no. Closer look revels that there aren’t any BBDs present. Just a digital 20K Itri Erso ES56028 echo processor chip. I highly doubt these two sound anything alike. At least the delay line is different enough to warrant this assumption. Mix control is nice addition when we want to dial in smooth and ambient chorus tones. Tone affects the frequencies chorused, rather than the overall tone. Another feature that gives more to the sound than one would think.While all Boss choruses have a great reputation, i tend to see one fault in all of them. The range of LFO speed feels to be always from too slow to slow. Same thing here. If we disregard that, we have good controls and nice chorus sounds. Not perfect, and i’d still choose my CE-3 over this in a heartbeat every time. If you get one for ridiculously cheap, then get one. I may keep my eyes out if i happen to run into the pink labeled version at some point.Pinging is currently not allowed.There is not a single picture of the reverse side and I’m reassembling one for scratch. The chorus level control is a great idea on the CH-1, if you don’t consider chorus to be a simple on or off effect. The CE-3 sounds so good, it doesn’t seem to need a level control. This board is a lot different than the older ones. Is the small item in c10 next to the larger echo chip still the stock.47pf capacitor? I want to solder it out and replace it with different capacitors.In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser. The CE-x pedals doesn’t do this and some people find the CH-1 is best for solo playing while they use the CE pedals for chords. The EQ knob is really a tone control that enables you to choose whether the CH-1 should sound more like a conventional chorus or have the edgy chorus that only the CH-1 can produce. The CH-1s made after this time uses digital circuitry and surface mounted components while the older version uses an analog MN3007 BBD. Did you miss your activation email ? This leads me to believe that whatever is responsible for generating the sweep LFO inside the pedal has gone bad. Is this what the clock driver (mn3101) does. I can take voltages if that would help as well. Thanks! Schem: If it were outputting a constant voltage, varying the depth control would vary that voltage and make a chorus. Your manual twiddling replacing the LFO, basically. It's not the clock driver MN3101 that's at fault though. That drives the delay line, and if it had gone, you'd get no delayed signal at all, and no chorus in any situation. I'll bet those are tantalum bead capacitors (big values in small packages -ideal for effects). But the trouble with tantalum caps is that they hate being reverse polarised even briefly, and will die if this happens. I'd be pretty suspicious of them. Another possibility is a broken connection to the Rate pot. That would kill the LFO, and mechanical failures are more common than electronic failures by a wide margin in my experience. Good luck, Tom EDIT: Come to think of it, they should really stick diodes in the LFO circuit to block any reverse polairty power. Makes perfect sense to me. I've hit a stumbling-block. After getting this pedal and being convinced I could figure it out it turns out the version I have is much newer, and nearly all surface mount. What's more, I don't even see a separate mn3101 and 3007 ( I think they may have been condensed into the large 28 pin?) Anybody have a schem for this version. I don't know what anything is now. I could not track down the schematic myself. From what you said, the DSP is still delaying since you can make chorus tones by modulating the rate knob by hand. I would trace out the connections from that potentiometer and try to figure out who the modulating IC is, then debug it from there. Can you tell us the first number on IC1 (under the orange mark).I'm just curious what this DSP is. Still, it isn't impossible, so let us know what you find out. Sorry! Tom. According to this page on BossArea.com, the marketing of the CE-2 was stopped in November 1982, but the pedal was still produced and sold at least until 1990. Even though it's no longer in production there are thousands of these pedals being used by guitarists all over the world -- it's one of the more sought after Boss pedals on the used market.The input and output circuits use a uPC4558C IC while the LFO is made with the help of a TL022LP op-amp IC.D3: 1S2473 (replaced with a wire jumper in newer models) D6: RD5.1EB (5.1V Zener diode) D7: RD11EB (11V Zener diode) Q1-Q3: 2SC732TM-GR (NPN silicon transistors) Q4-Q8: 2SC945-P (NPN silicon transistors) Q9: 2SK30A-Y (Silicon N-channel junction field effect transistor) LED diode: SLP-135B. However, the main difference noted is that the CH-1 seems to be a better option for more subtle levels of chorus while the CE-5 handles more extreme levels better. The unit has a very bright sound and a clear presence in the mix, though there are reports it can be a bit sterile sounding. This allows the effect to drive two different speakers or amplifier simultaneously. Allowed HTML tags: Lines and paragraphs break automatically. Plain text No HTML tags allowed. Web page addresses and e-mail addresses turn into links automatically. Lines and paragraphs break automatically. Comments Allowed HTML tags: Lines and paragraphs break automatically. Let us know! Please contact us for the latest information or to see if we have a B-Stock or an alternative available. Features: Classic BOSS chorus pedal with clean, brilliant sound for guitar and keyboards Effect Level, EQ, Rate and Depth knobs allow for precise shaping of sound Features Mono input and Stereo outputs for connection to dual amps You can unsubscribe at any time. See our Privacy Policy for more details. We've sent you a verification email, so the latest updates, news and exclusive offers are just a click away! You can unsubscribe at any time. See our Privacy Policy for more details. Stay tuned for news and updates coming your way! You can unsubscribe at any time. See our Privacy Policy for more details. Stay tuned for news and updates coming your way. You can unsubscribe at anytime. Subscribe Personal information provided may be collected, used and disclosed in accordance with our Privacy Policy Connect with Us Connect with us on your favourite social networks. We’ll let you know what we’re up to, and you can tell us how we’re doing. Ready To Ship. The CH-1's four onboard controls let you take charge of your chorus sound - there are effect level, EQ, rate, and depth controls. Crank up the rate for a dizzying psychedelic twist - or, pull back the rate, turn up the depth, and use the BOSS CH-1 in stereo for a lush, wide wave. Ideal for guitar, bass, and ukulele, the clip-on TU-01 is the most affordable tuner in the trusted BOSS. Two switches in one BOSS new FS-6 combines latch- and momentary-type switching into one unit. With two switches conveni. Simply put, the BOSS DS-1 distortion pedal is a modern classic. For the better part of 30 years, you've. It combines a. Shop Online with lowest prices in our Music Instruments Online Store. Please do not offer the downloaded file for sell only use it for personal usage. Looking for other manual. Document preview No preview for this item!For this no need registration. May be help you to repair. You could suffer a fatal electrical shock. Instead, contact your nearest service center. Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition, Also some files are djvu so you need djvu viewer to open them. These free programs can be found on this page: needed progs If you use opera you have to disable opera turbo function to download file. If you cannot download this file, try it with CHROME or FIREFOX browser. Translate this page: Relevant AUDIO forum topics: HT-520 Hazimozi erosito melynyomo gerjed. Sziasztok! Hoztak javitasra egy 6 csatornas hazimozi erositot. Az a baja,hogy a mely sugarzo hangszorobol eros hangos gerjedes hallatszik. Ez egy olyan fajta cucc, a tap es az erosito a melylada dobozaban van bent. Es termeszetesen a melysugarzo hangszoro, a tobbi hangszorot kell csatlakoztatni hatul. Tipusnak az van a hatuljara irva,hogy HT-520 de gyarto nincs. A panelrol lehuztam a bemenetet a center es a SUB van egy panelon es a ket elso es ket hatso van masik panelon tehat lehuztam a bemenet csatit es akkor is gerjed de hangszoroval megneztem a tobbi csatorna csendes csak a SUB csinalja. Mivel a tap kozos nem hiszem hogy azzal lenne a baj mert akkor szerintem a tobbi csatorna is zajos lenne. A vegfok IC tipusa TDA 7296.Kerem akinek van otlete segitsen. Koszonom! Ja az IC-t kicsereltem egy ujra de a hiba maradtt!A teven dig. optikai audio kimenet van,ehhez kellene csatlakozni. Balint CD lejatszo tuning Udv mindenkinek. Szeretnem egy kicsit megtuningolni a CD lejatszomat, egy Technics SL-PS740-et, viszont az ilyesmiben nem vagyok jaratos, de nagyon erdekel a dolog.Elsore a muveleti erolkodoket cserelnem. Most 1db LM833M63, es 3db BA4560FTI dolgozik benne gyarilag, az lenne a kerdesem, hogy mire lenne erdemes cserelni. Az OPA2134-et olvastam, hogy eleg nepszeru, valoban jo valasztas lenne.Have downloaded the schematics from this forum to help repair the amplifier of a friend. Turned out that Sony decided to route the earth through the chassis, even the earth between the various supplies. When one takes the main board out of the chassis and switches the amp on, there are up to 20 volts difference between the eart (and hence reference) of the pre-amps and the main amps. Luckily the amp goes into protection but from a design point of view it is not nice to rely on screws and aluminum face plates to conduct up to 0.2 amps of current from one supply to another. What I did is solder wires to every eart point and connected them on the main board to make it stand alone and not rely on conducting current through the chassis anymore. Bad design, simple repair but took some digging in the schematics to find out what exactly was going on!