Hi Ed
Yes you are correct, the volume pot measures 122k. The Americans are strange with their markings.
One of the intervalve transformers is 6:1 and I have a replacement for that one, very kindly given to me by Dave. The other one is 3:1 and that will need a rewind.
I may be able to salvage the speaker field coil as I have found that by carefully scraping away some of the interleave tissues at the edge, and scraping a little insulation off the copper windings, I have found there is continuity on the 20th layer from the outside of the coil. If I unwind the coil to that point and reconnect, it should only be about 13% of the total that is lost.
The AC 064 output valve tests a bit low, with a gm of only 0.9, but the anode current is 12mA at 200v and -20v bias so it may just work.
Next job will be to test the mains transformer windings.
Mike
Yes you are correct, the volume pot measures 122k. The Americans are strange with their markings.
One of the intervalve transformers is 6:1 and I have a replacement for that one, very kindly given to me by Dave. The other one is 3:1 and that will need a rewind.
I may be able to salvage the speaker field coil as I have found that by carefully scraping away some of the interleave tissues at the edge, and scraping a little insulation off the copper windings, I have found there is continuity on the 20th layer from the outside of the coil. If I unwind the coil to that point and reconnect, it should only be about 13% of the total that is lost.
The AC 064 output valve tests a bit low, with a gm of only 0.9, but the anode current is 12mA at 200v and -20v bias so it may just work.
Next job will be to test the mains transformer windings.
Mike
