Tube Amps / Music Electronics
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|4/21/2004 5:44 PM|
|Trace - Voodoo Amps
||Re: octal tube preamp ideas wanted...|
The black based GE 6SL7's are my favorites, they also usually have the silver tops as you mentioned.
Hope it helps Craig;
|4/13/2004 5:50 PM|
(Wow it's been a long time since I posted here!)
I built an amp that was basically a 6V6 Marshall using 6SL7's for the preamp and I will NEVER use them again.
The tone is great - the noise - intolerable. Maybe I just happened to have three bad tubes, but I went absolutely apeshit trying to figure out where my noise was coming from. I was getting an AC-sounding hum, so I elevated heaters, re-did every ground in the amp and basically resoldered every connection on the board. After all that - it was the frickin' 6SL7's!!! All US made NOS, by the way...
Granted I should have diagnosed the problem earlier but hey, it's a good thing I don't work in a service shop.
I found I didn't get enough gain out them compared to 12AX7's, too. 12AX7's were adopted en mass for a reason I figger.
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|4/13/2004 6:05 PM|
Cheers for the help guys, the main reason I want to use some octal preamp tubes is because I played an amp at the Matamp factory that used them and it sounded great - anyway, there are millions of amps that use boring old 12AX7s
|4/13/2004 6:36 PM|
...anyway, there are millions of amps that use boring old 12AX7s..
That's exactly why I tried the 6SL7's, too.
Even if the tubes I had weren't noisy (as in the hum), I probably wouldn't use them again due to the high microphonics.
|4/14/2004 12:41 AM|
All of what you describe is true. But you can find some good ones,its just hard to find them. Working on quite a few B15s this is one problem you see alot. I found from even same brand of NOS,they can be quite different,noisey or microphonic.
|4/14/2004 4:13 PM|
How are you doing? You're right, I'm sure there are good ones out there, but debugging that amp pissed me off so badly I won't be hunting any down anytime soon.
|4/17/2004 11:58 AM|
||Maybe use both?|
You could build a two channel amp with an octal in one and a 12AX7 in the other. And you can put the two channels in parallel to easily select one or the other. I like the 6SL7 and 6SC7 tubes a lot and haven't had the major microphonic problems that others mentioned. You could also try a 12AX7 to 6SL7 adaptor plug.
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