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Originally Posted by merlinmaxwell
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I would say that, considering the high input impedance of the output valve (many MOhms)
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There is the 1M volume pot to ground (ground ish anyway) 0.05 is 20Hz (not noticable) 0.005 200Hz (most noticable).
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Might have to find a narrower type to fit inside the tube
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It has a low voltage across it, a slim 63V job will do admirably. |
That'll teach me to look at a schematic before posting! The 1M pot will indeed affect the low frequency roll off.
Anyway using the formula 1/2pi*R*C for the -3dB roll off frequency and substituting 1M (volume pot) for R gives:
32Hz for a value of 0.005uF for C24 and 3.2Hz for a value of 0.05uF. Both should be acceptable in this radio I would have thought.