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Old 17th Aug 2019, 4:23 pm   #27
davidgem1406
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Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
Default Re: Unknown Home Built TRF radio

I am now looking for some pot to replace the gain control (See above threads).

I have found that the GEC AC mains 4 uses almost the same circuit, but this has a normal pot with a value of 7K.
From what I can see, there seems to be no reason why this set I am rebuilding cannot use a normal pot of an appropriate value.
The value I will try to decide from what I can measure of the tracks on the original. Maybe 47K.

Using a normal pot may also solve the problem of fitting a DP on/off switch, although I have solved this by fitting a pot with a DP switch, with the track and contacts removed, to the back of the wave change switch. That does introduce other problems though.
A normal pot with a DP switch would be much better.

Any thoughts on this would be appreciated.

Regards Dave.
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