Quote:
Originally Posted by Studio263
In particular, the metallised paint on the EF39s has to be in first class condition and properly bonded to the relevant pin or the whole thing just oscillates at its IF frequency and you get -20V (or more) of AGC bias, meaning that sensitivity effectively drops to zero. I fixed the last one by wrapping the EF39s in cooking foil with a loop of wire wrapped around between the 'hip' of the glass and the plastic base. This was then soldered externally to the pin on the base. It worked a treat, but I'm sure there are more elegant ways of doing it...
|
Maybe the solution at the end of this link can give some help:
http://www.glowbug.nl/radio/170A.html
Jard N.