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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: DYNACO Low Power amp with EL34 instead of EL84 posted by Burney on November 10, 2016 at 22:08:56:
"Would 12AU7 work?" NO! Gain is too low and the type is non-linear. IMO, the only audio roles the 'U7 is suited to are cathode follower and "concertina" phase splitter.
"Is that CCS absolutely essential?" YES! In an "El Cheapo", loop NFB is applied to the LTP's non-inverting grid. The CCS forces symmetry upon the 2 triodes of the LTP.
"For the power supply I am will retain the current arrangement that gives about 420 volts at tops. It does have a neg bias tap." That tap is OK for an O/P tube bias rail (C-). You will have to construct a negative rail (B-) that can comfortably provide the 12 mA. needed by the 2X LTPs.
Eli D.
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- RE: DYNACO Low Power amp with EL34 instead of EL84 - Eli Duttman 07:06:09 11/11/16 (0)
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