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Old 22nd December 2011, 11:46 AM   #11
john65b is offline john65b  United States
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I am thinking of a 12AX7 / 12AT7 / 12BH7... or 12AT7 / 12AT7 / 12BH7...don't want to pay for the kit, so it would be point to point. I have all the parts....why not.
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Old 25th April 2012, 09:16 AM   #12
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hey John ,

how is it with the JP200 in the meantime ?
i'm also making one with some up-grade parts ,but i must stil put them together.

regards
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Old 19th May 2012, 12:49 PM   #13
john65b is offline john65b  United States
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Hey, sorry for the Way-Late reply...some reason I am no longer subscribed to this thread, or notification is in my spam folder...

I have not yet started this project, as I have gone off tangent on an ESL speaker project...

I have also aquired some other tubes - 6DJ8, 6NP1, and 6H30 - that are begging to be part of this. If not a success, the tubes will go into an Akido all-in-one PCB I have.
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Old 20th May 2012, 06:50 AM   #14
AJT is offline AJT  Philippines
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my experience with with tubes is that even the simplest topology given a very good power supply and a good operating point can really sound excellent.....

as i said before, i use 12ax7 exclusively for guitar amps.....the very high mu limits its usefulness in a line stage, unless lots of nfb are used to tame the gain....

for me 6DJ8, 6N1P, ECC88, 6H23 and 6H30 miniatures and 6sn7, 6H8C octals are the go to tubes for line amp duty....
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Old 20th May 2012, 08:33 AM   #15
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Horrible circuit.
To much gain.
To little current.
Excessive feedback (with compensation for stability).
Three caps in the signal path.
Three gain stages - when one would do.
Bare cathode follower.

Horrible.
Forget this circuit and go to the proven Aikido.

Shoog
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