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Thanks for the info/links - what I suspected but thought would be repairable. The board is on backorder so this repair goes on the back burner for now.
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Marshall TSL 100 Bias Drift
I have a TSL 100 that appears to have an issue with bias drift. Initially, I can set the bias on both pairs of EL-34s. After about 10-15 min one side keeps...
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Sad story about Peavey service - another US company building off shore to avoid tax burden in US. The company I work for not only makes money on service and...
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No this amp has no hole drilled in chassis for the rectifier tube. Just want to know if there was additional filtering for the diode version??
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Sunn 200S
Sorry if this is the wrong place to post this..looking for a 200S schematic with solid state rectification. Are the filter caps the same as the tube rectified...
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What's the consensus on tube shields? Do they reduce power dissipation?
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Okay thanks for pointing me to the obvious since I didn't believe the new Sovtek 12AX7 could be bad/noisy!! Replace it with a newish GT ECC83 and the waveform...
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I haven't used this forum in awhile - where are the attachments that I posted?...
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Noisy Sunn Sonaro
Well performing amp except output has noise (see attached). The filter capacitors as well as other electrolytics have been replaced. If it's ripple from the...
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These folks still build FETs and do a very good job ..........http://www.linearsystems.com/...
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No they still build radials and surfacemount packaged parts....
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I will scope the +3.3V supply to see if there is excessive ripple but this DSP board only has tantalum capacitors on it - these are usually very reliable...
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I checked several locations on the board for the +3.3V bias and only measure +1.27V even at the LDR on the DSP board. so there is either something wrong with...
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Fender Vibro Champ XD DSP issue
The amp has an issue with the DSP - some of the voice features will squeal and feed back and FX features ( delay, reverb) don't work. I chop sticked the DSP...Last edited by gbono; 04-29-2019, 11:00 PM.
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rotary encoders shouldn't be vibration sensitive....are there any ceramic capacitors in the signal path that have temperature characteristics of either X7R,...
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Input or output jacks now grounded (no fiber insulating washers)?
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I remember the electronics salvage stores, back in the 60's 70's, near LAX and the aerospace companies - where you could buy the rejects/surplus from Fender...
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