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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: Phase inverter tube choice question posted by airtime on May 8, 2020 at 12:44:27:
V1 is a differential gain block phase splitter, AKA long tailed pair (LTP). The theoretical max. gain for such a setup is 1/2 the amplification factor (μ). In practice, roughly 1/4 μ is obtained. Kudos to the designer for using a constant current sink (CCS) load in the LTP's "tail".
That 1/2 V2 is a ubiquitous common cathode voltage amplifier. The bottom line is that all the small signal tubes in this setup are amplifying and, therefore, the non-linear 12AU7 should be eschewed.
As long as sufficient heater current is available from the power transformer, only 12BH7s should go into that unit.
Eli D.
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Follow Ups
- RE: Phase inverter tube choice question - Eli Duttman 14:19:37 05/08/20 (2)
- RE: Phase inverter tube choice question - airtime 18:40:45 05/08/20 (1)
- RE: Phase inverter tube choice question - Story 07:42:36 05/09/20 (0)
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