1947 Crosley 307TA (630 clone) issues

[earlyfilm]

Originally Posted by Kamakiri

We're thinking possibly the contrast control at this point, not sure. It was VERY touchy before this, and now I'm wondering if it's the culprit.

The factory manual was listed in my early post.

As you said, the control is RCA part number 73157 with no cross reference.

Picture half is 10K Ohms tapped.

Volumne half is 1 Meg Ohms tapped and with AC switch and dual shaft length to fit early RCA. (The same control is found in some clones, including Teletone look-alikes that were not clones.)

Correction (07/27/2013):

Sorry folks, I kinda put my foot in my mouth on this one.

I looked about for another same combination control with switch and could not find one.

I suspect the only commonly available replacement control would be from an RCA 8TS30. Before I'd go looking for a parts set, I'd first confirm that the control is at fault and, if so, open it and see if it can be repaired, possibly by robbing a 10K element from another control.

While some of the other early sets used similar circuits, but after this one, I don't think anyone ever put the volume and a gain-type of picture control on the same shaft.

It seems too many people accidentally bumped the picture control while adjusting the sound and could not understand what they had done to mess the set up.

Jas.