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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Not only him posted by Tre' on August 13, 2021 at 10:00:32:
Apparently I didn't do enough research. Since the 6CG7 isn't a direct plug 'n play replacement for a 12AU7, I must have missed posts recommending it.
I did some more homework just now and found a couple of comments on the 12AU7. One, by former Inmate Neff (who I always appreciated) said, "As I stated the only worse thing [than] having a 12AU7 in an amp is a chassis fire." which brought me a good laugh over my morning coffee. I was aware that the 12AU7 wasn't a respected tube, but humor like that almost always gets my attention.
The second comment was by Mike Samra, who wrote, "I will tell you and I know others feel this way, I don't like the 12au7 in an amplifier, period! The 6cg7 is so much better and it's more or less a drop in replacement for a 12au7 by just moving the filament wires when you have a 6.3v fil source. The tube is much more linear and makes more power and the end result is lower distortion with a more detailed and open sound.
For the life of me i can't understand why any manufacturer or builder would still use the 12au7 and the only thing I can think of is, they are cheap, and available."
End quote. (link to Mike's post below)
My unenthusiastic idea was to convert the amp to 12A77s, since it only involves a few resistor changes, and because I have five NOS JAN 12AT7s sitting here, doing nothing. Triode Kingdom informed me that the 12AT7 would only be marginally better than the 12AU7 though, hence the lack of enthusiasm.
Converting the VTA board to 6CG7s will require cutting and rewiring a few filament traces, but I had thought about hacking into it anyway, to add the CCS they now use, and eliminating the AC balance pots. I've got nothing to lose, since the amp's just been sitting here collecting dust for a long time.
Once again Tre', thanks for the recommendation. You brought some hope and possibilities to an amp I had no idea what to do with, and it's always nice to have a plan.
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Follow Ups
- Thank you Tre' - 1973shovel 06:07:18 08/14/21 (1)
- You're welcome. nt - Tre' 17:50:52 08/14/21 (0)
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