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In Reply to: RE: I'm interested for Ampeg B-15 posted by maxhifi on February 12, 2016 at 10:39:25
For guitar and bass amps, I've used Tungsol or Sylvania 6SL7WGT tubes. Pretty good success --- tone wise and quiet service. If the tube is any bit noisy, the combo amp will rattle these octal tubes to pieces.
Mil spec, brown phenolic base. I like the black plate, big chrome tops. Kinda hard to find good NOS, these days though...
Bet they'd sound pretty good in hi-fi apps.
Follow Ups:
"If the tube is any bit noisy, the combo amp will rattle these octal tubes to pieces."
Just wondering what you mean here. I'm a bass player and just renovating a Selmer Treble n Bass, which is close to a Fender Bassman circuit. I was wondering about making the second input a 6SL7 like the B-15.
Do you mean 12AX78 are more rugged, or less microphonic or what exactly?
Thanks for your informed input, as always!
In my experience, I've had octal front end tubes get noisy or microphonic a bit easier than their 9-pin mini counterparts. Esp high mu ones, like 6SL7GT.
I think that long plated tube are more susceptible to microphony.
I collect 6SN7s, with the earliest incarnations (the GTs, Ws and As) are notoriously microphonic . I found out that my collection had many microphonic tubes that weren't picked up/heard as the driver in an integrated tube amp I was rolling these tubes in. It was only apparen't when I got an AES AE-3 preamp with the 6SN7s playing a crucial role in the amplification circuit.
As it turned out several of these tubes sounded great despite the microphony. If the microphonics are only heard when tapping the tubes, it seemed to work well. I know I and some other people think that it actually gives the sound a little more depth and sound stages a bit better. All I am sure of is that unless it is so bad that it causes a feedback loop, and you don't play drums on your tubes while playing music, they work fine with IMHO. The bad side of course that I can't sell them off without noting this.
That's my experience.
8^)
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