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In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: To cheat or not to (ccs)heatPosted by N-set on: 8/3/2011
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 Romy the Cat wrote:

Anyow, it is not difficult to find out if your copy works +/- properly.  If you have right plate voltage and the tube has the expected gain then the stage works fine. I do not remember now but I believe in closed loop the corrector shall give 55dB or something like this, it is not difficult to calculate. Did you use air caps or cheated and used mica?
 
The Cat


Thanks for the reply.
That's the problem--I don't seem to have the right voltage--too low, even as low as 110V, depending on a tube
(at the moment shitty Chinese).
I've ordered resistors to change the divider to 1.1V to see how it behaves. I did not measure the gain still,
listening to white noise...

I've modyfied your design a bit adding CCS heating. Don't ask me why...an intellectuall capriccio,
which costed a significant layout complication and to some extent unfortunately compromise.
There is no fucking cheating Stick out tongue Will post some pics soon.

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