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GM-70 cathode feed SE amplifier
GM-70 cathode feed SE amplifier
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Old 6th April 2009, 11:43 AM   #11
Bandersnatch is offline Bandersnatch  United States
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Also add that the grid is now a screen, keeping the input away from effects of the output...no more Miller. However, a driver stage with reqired output Z to drive the cathode will not much mind the plate capacitance I suspect.
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Old 6th April 2009, 12:17 PM   #12
kavermei is offline kavermei  Belgium
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basically what Jan and Douglas are saying, most importantly the driver sees a constant load regardless of grid current.

Also (if I remember this correctly, anybody pls correct me otherwise...) grounded grid gives a slightly higher amplification factor compared to common cathode (1+mu vs. mu)

Finally the drive signal is in series with the load (OPT primary) so, other than the fact that the driver contributes directly to the output power, I'd guess this would have an effect on the sound too.

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Old 19th April 2009, 03:59 PM   #13
audiodesign is offline audiodesign  Italy
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This is my last test about GM70 performances

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