Quote:
Originally Posted by Tubejunke
Thank you all and for a lot of good info and interesting reads. Back on the first page someone asked if I had made sure that the three variable capacitors were turning in sync. Indeed they are via what looks like leather strands.
|
Those straps (they are brass on a AK40) LINK the tuning caps, but they are most likely NOT optimally aligned! The pulleys those strands are wound on attach to the tuning caps with set screws. Tune a station, loosen a set screw of a pulley NOT on the knob shaft, tune that cap INDEPENDENT of the others for best volume, repeat for other cap/pulley not on knob shaft.....This is to a TRF set what IF alignment is to a superhetrodyne. You should see some to MUCH improvement from doing this.
The bands should be reasonably taught to hold that adjustment...If they are not, then there should be a way to shift the caps in their mountings to tighten the bands....It's been a while since I dealt with that procedure so specifics are not coming to me.