(22-12-2015, 10:50 AM)Mark Hennessy Wrote: In practice, I've never found the adjustment to be all that critical, surprising as that sounds.That is probably why it sounded very good with the wiper missing and just acting as a 5k resistor in circuit.
Your method sounds easy, I will give it a go this afternoon.
I replaced the three AF117's (one AF117 in the FM front end had already been changed for an AF127) and it is working very well on AM. I have done an AM RF alignment, it did need peaking, and it is receiving very well now. FM is working very well so I am not going to alter that other than adjust VR28.
After cleaning the controls and testing for crackles etc I put it all back in the case and then found the treble was very intermittent, after removing the control to give it a full clean I discovered the problem was just a dry joint. Where the 10R resistor loops through the end terminal solder tag there was no solder wetting the tag, it was just relying on the resistor wire feeding through the solder tag hole.
These sets are very well made, I like the way the holes in the printed circuit have little hollow rivets for the transistor leads to go through, a nice touch.
I think the owner is going to be very happy with it, he bought this one new in the 60's. He has been buying them ever since and has one in every room.
Thanks
Mike
