Great on the DIY!

Just an update; located the Service Manual / schematics. Doing a review. Would post again with initial diagnosis and test procedures in a while. May not be that immediate; bear with me.

Offhand, proposed test for the presence of +12~15V on:

• • before and after Rs 146, 121, 133, 161, 162, 176.

Appreciate the post back. To your queries:

• • 12v (presumably DC) - as posted above, +12 hence it would be DC due to the presence of the prefix +;
• • do not know where - the main issue is on the radio / tuner section. The above proposed test would be on the resistors in the same section likewise. The tuner section would be right side. R146 is near the MW/AM switch, R121 near IC101, R133 between VC102 and C128, R161 near crystal X101, R162 in line with R161 and R176 near IC103;
• • do not have these schematics - would an electronic copy be of help?

This is very significant as it would indicate that possibly:

• • a cold solder issue (most likely);
• • low or initially missing +12 (likely);
• • a capacitor that takes time to charge up (least likely);