Tubes Asylum: Re: thank you by Lew

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Re: thank you

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Lew

In Reply to: Re: thank you posted by Genn on October 1, 2001 at 23:53:09:

Since you seem to have so much more energy than I do these days, try the performance of SRPP with and without a bypass cap for Rk of the lower tube. In the case where you don't bypass Rk in the SRPP, then Rk2 (the cathode resistor for the UPPER tube) is related to Rk1 (Rk for the lower tube) by the formula: Rk2 = Rk1(mu+1/mu-1). I built my SRPP input voltage amp using a single 6SN7 and set Rk1 = 1K ohms, then Rk2 = ~1.1K ohms. With about 250V across the whole circuit, input Vg = -3 (all from memory; I could be slightly wrong on these voltages). I would love to learn whether there really IS a demonstrable performance advantage if you leave out the bypass cap and re-adjust the value of Rk2 according to the equation. My amps sound very sweet and at the same time linear and detailed.

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Topic - What are the benefits of SRPP? - Genn 00:01:42 10/1/01 ( 11)

Re: What are the benefits of SRPP? - Lew 07:47:21 10/1/01 ( 10)
- Re: the benefits of SRPP - Genn 08:41:35 10/1/01 ( 9)
  - Re: the benefits of SRPP - Lew 11:38:55 10/1/01 ( 8)
    - Re: thank you - Genn 23:53:09 10/1/01 ( 7)
      - Re: thank you - Lew 10/2/01 09:44:11 10/2/01 ( 6)
        
        Re: mystyping? - Genn 01:24:04 10/3/01 ( 1)
        
        Re: mystyping? - Lew 06:43:49 10/3/01 ( 0)
        
        Re: I'll - Genn 00:28:25 10/3/01 ( 3)
        
        Re: I'll - Lew 06:44:46 10/3/01 ( 2)
        
        Do you mean to intrude! - ATam 08:40:26 10/3/01 ( 1)
        
        Sorry, it should be 'Do not mean ...' (nt) - ATam 04:46:34 10/4/01 ( 0)