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Old 6th August 2012, 06:42 PM   #1
diyAudio Member
Join Date: Aug 2011
Default Crate v50-112 noisy clean channel

Hello everyone,

I wonder if you could help me. I have a Crate V50-112 guitar tube amp that sounds great, except the clean channel is noisy even when the volume in down to zero. It is not the case with the overdrive channel. Here are two files for your reference. Please let me know how to "hush" down the clean channel. Thanks!
Attached Files
File Type: pdf crate_v50.pdf (179.9 KB, 59 views)
File Type: pdf V50-112_OM 11.pdf (69.2 KB, 34 views)
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Old 6th August 2012, 11:50 PM   #2
diyAudio Member
Join Date: Oct 2004
Location: Adelaide South Oz
If you check the clean signal path then there is not much which can be causing this. It pretty much has to be a relay with dirty contacts or more likely tube V2. The schematic is a problem too. Pins 6 and 7 of V2B are certainly NOT connected together as shown. Go to the hardware shop and get a spray can of contact cleaner. Clean the V2 tube socket. If that doesn't fix your problem replace V2. If problem persists report back - you may then have to start looking at replacing a relay.
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Old 14th August 2012, 04:10 PM   #3
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Join Date: Aug 2011
Default Thanks!

Thank you for your comment. I replaced V2 and that fixed the problem!
The schematic is from Crate directly.
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