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I've got an Ampeg J-12 in for repair. A prior repair shop had changed the 6BK11 preamp tubes to 6K11's. Unfortunately one of the 3 preamp stages in each 6K11 tube has a much lower gain than 6BK11's, which has caused problems in the amp. I can't find 6BK11's anywhere at any price, but I did a little research and believe 6C10's would work. These are hard to find also, I think I read somewhere these were used in the Rivera-era Fender SuperChamps. Anyone have a source for a couple of these tubes?
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Enter 6C10 into google.
LOoked like Tube Depot had some.
I didn't enter the 6K11 or 6BK11 into google, always worth a try.Education is what you're left with after you have forgotten what you have learned. -
By some chance, did you e-mail me today about this? I got an e-mail looking for 6BK11's. I do have two NOS in stock, but have NO idea where to get more. The well seemingly has run dry.Comment
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This is a painful subject for an owner of a J12-D and an Echojet. Are there ANY compactrons available? Is it possible to change some other values in order to accomodate available tubes--assuming there is such a thing?Comment
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6C10's worked as 6BK11 replacements in Ampeg Jet
jrfrond, it wasn't me who emailed you looking for 6BK11's - I was searching for 6C10's to validate that they are good replacements in an Ampeg. You should hang onto those, they are in scarce supply and very expensive.
Update: I followed Enzo's suggestion and went Googling for 6C10's. Found a couple online tube suppliers, but they never responded to my calls, so I took a risk and went the eBay route. I needed both preamp tubes because someone had swapped in two 6K11's which are pin compatible, but one of their three triode elements has a much lower gain than the other two.
For Ben N, the good news is that 6C10's are a good substitute for 6BK11's in these older Ampeg amps. I installed them and the amp is working fine, including the tremelo.Comment
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Are they the short fat 11 pin tubes? 6BK11?
I've gotten them from New Sensor before, maybe they still have them.Comment
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6BK11 = 12-pin Compactron
drewl - they are the short, fat, 12-pin "Compactron" tubes.
My search experience was that you can find 6BK11's for $40-50 and the 6C10's go for $25-35. My client needed two, and was sensitive to price (he had previously paid another shop for the pair of incorrect tubes), so I went with the 6C10's.Comment
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New Sensor non-dealer price was $45 but they're showing out of stock.....no wonder you want to try 6C10's!Comment
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