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Of all the 12A_7 series the 12AU7 is the LEAST worthy - as a design!!

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Timbo in Oz

In Reply to: RE: Has anyone tried these 12au7's yet? posted by earnie3 on June 10, 2012 at 10:35:40

Rolling them is damned close to a waste of time. there are a few which ar good enough but all NoS and already demanded to rare and $$$$. The Brimar 13D5 is the one I've used and NoS 6189s aren't bad. Yes there are others.

I hesitate to say this ;-) but I agree with Mike Samra. There are other noval tubes which are a good swap. The 12AY7 (no rewiring needed and less heater current, and more gain - possibly), the 6DJ8 family, the 5687, ECC99, ....

Note that a post in response is preferred.

Warmest

Timothy Bailey

The Skyptical Mensurer and Audio Scrounger

And gladly would he learn and gladly teach - Chaucer. ;-)!

'Still not saluting.'

Follow Ups:

RE: Of all the 12A_7 series the 12AU7 is the LEAST worthy - as a design!! - Cleantimestream 06:09:39 06/23/12 (0)
I have built a couple of amps with that tube in the schematic and say to myself "Well, good schemo but 12AU7 will have to go, substituted by 6SN7"
The Mind has No Firewall~ U.S. Army War College.
RE: Of all the 12A_7 series the 12AU7 is the LEAST worthy - as a design!! - Michael Samra 15:32:32 06/11/12 (2)
Agreed 100%,and I don't eve hesitate to say that!! Argh arch!
When problems become increasingly difficult,we can always rely on our collective knowledge and seek relief.
- RE: Of all the 12A_7 series the 12AU7 is the LEAST worthy - as a design!! - marvda1 10:24:49 06/24/12 (1)
  so why do big name(well known designers) use them?
  Freelance reviewer for StereoMoJo
  - RE: Big name designers use 12AU7 - Neff 16:28:47 06/24/12 (0)
    12AU7 is available in new manufacture and that is attractive to a new manufacture amp to keep costs down. I also say the big name designers are cutting corners unless perhaps used as a cathode follower or cathodyne phase splitter. Even at follower or phase splitter service there are better new manufacture tubes such as the 6SN7.
    
    Most DIYers are wise not to use 12AU7. Why shoot yourself in the foot when a fortune was spent everywhere else in the DIY design to have a 12AU7 muck it up?

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