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In Reply to: RE: The passive RIAA EQ network has some insertion LOSS posted by grhughes on March 21, 2012 at 06:41:43
1) He has a 6072 in there now.
2) We are talking about the second tube
that doesn't drive the RIAA network.
3) He already stated that his PS
will handle the extra current.
4) The 12AU7 has alot more drive than the 6072.
Dan: 1. Forgive me but in my manual an ecc83 is the European/British designation of a 12ax7 not a 12aY7. 2. He clearly states he needs less gain and is pondering using a 12au7 instead of a 12ax7. 3. Yes, a 12au7 has more current drive not voltage drive than a 12ay7, it is a power amplifier not a voltage amplifier and a pitiful tube in my estimation when used as a voltage amp.
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)
It was a mistake from me i have indeed original 6072 tubes in the phono amp
and i have now the 12au7 installed as Dan told me
but i have the cathode cap still in place
the gain is good now
The sound is different i must play a few day now to get used to the sound
its a little fatter sound maby a little slower
then i will also try the ecc99
Try removing the bypass cap.
It will only reduce the gain from 9 to 8.
I doubt you will hear the volume change.
You will hear the sound change though.
PS What resistors did you use?
Wirewound will give you a fatter sound.
i put some resistors parallel to the original resisters to get the values
i think these are carbon
the originals are tantalum
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