Spirit box / ghost echo - no wet signal

[slacjs]

I wrote a big post explaining what I've tried and checked, then realised I've plugged into 18v. I'm not getting any wet signal. Have I fried my belton? Anything else that might be gone? I've replaced IC3 and IC6 and I'm still only getting a dry signal.

Thanks.

 

[Coda]

IC6 should have saved the brick. IC4 (TL072) can take 18v, so that should be fine too. Audio probe time. I would start at Pin 6 if IC1, and work backwards.

 

[slacjs]

IC6 should have saved the brick. IC4 (TL072) can take 18v, so that should be fine too. Audio probe time. I would start at Pin 6 if IC1, and work backwards.

Thanks for your advice. I've had a quick go. I'm getting a strong echo signal at pin 6 of IC1 and IC4, and pin 13 of IC5. I'm not sure where else I should be checking. I'm getting very faint signals on pin 3 of the brick, or 5. Not really sure where else I should be looking.

 

[slacjs]

Looks like it was the pt2339. Swapped it out and it seems to work, though I can see why people don't like these ICs. I've had to try a few until I found one that sounded decent.