Hello Forumites!
Is anyone here familiar with the 1971-72 Electronic Mighty Sound of Steam at the component level? I have a board which works fine for a few minutes and then the chuff volume gets very faint. If I turn it off and let it sit for a while it works correctly again. There are no integrated circuits on this board. There are three large electrolytic capacitors; my guess is that one of them has dried out or gone bad.
This is the variant without electronic whistle. The speaker works, the foam looks good and it's not shorting to the metal tender chassis. It's also not the loco-- I tested the circuit by touching the tether to the center rail, the issue persists. I'm familiar with component level repair and I think I can fix it with parts on hand if I knew what to replace.
Thanks in advance for sharing your experience! -Ted
