IMG_1233

Comment

Comment by Timothy Murphy on November 21, 2013 at 9:33pm

Tom, I have one of these with a misbehaving auto-tuner. The motor wants to run but does not. Manual tuning turns freely. I am going to dive into it next year for a full recap, but I'd like to study the mechanicals first. I cannot find any really useful guide to the Collins auto-tuner adjustment and repair. I have the blow-up engineering drawing. It looks identical to a GM TH700R automatic trans to me (eg., incomprehensible). Can you suggest some materials for me to read? Thanks

  

Comment by Tom Jardine on September 11, 2013 at 1:57pm

Thanks, Ken. It sounds pretty good after spending a lot of time going over all the circuits. It's a little bass heavy on FM, the loudness compensation cannot be switch out, but I can tame it with the bass control. I listen to it often, especially on short wave at night. The three tube magnetic preamp that is part of it, is not as shown on the schematics. It has two inputs, one for 33-45 rpm, and the other for a 78 player.

Comment by Ken Carr on September 11, 2013 at 1:43pm

Nice way to use a chassis-only radio. I'll bet it sounds great!

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