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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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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: NOVICE SRPP problem please help posted by 6dj8triode@gmail.com on May 20, 2024 at 05:37:53:
I want to bring to your attention an article that appeared in the May and June 2010 issues of audioXpress written by Merlin Blencowe titled: The Optimized SRPP Amp. As stated in the article, whether a circuit is a true SRPP depends on the load. If it can't drive current (ie direct connected to next stage) then the circuit is single-ended, not push/pull; with a very weak CCS load. Where things can get interesting is if the two tubes are the same and Rk1 = Rk2 and are not bypassed. If the output is taken off the lower tube's plate, the gain equation becomes one half mu (u/2). a "half mu stage" if you will. All it requires to implement is one dual triode and two resistors. The output voltage will be one half the B+. Disadvantages are: a rather high output impedance ( (ra +Rk(u+1))/2 ) and poor PSRR of 6dB. I am currently using this circuit as the input stage in an amp that is direct connected to the driver. I am implementing a CCS fed active shunt reg. to provide the low noise B+.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: NOVICE SRPP problem please help - JKT 12:53:17 06/04/24 (0)
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