HD 150 channel 2 not working

Dhennessy

Wondering if anyone has run into this. I’ve had my HD-150 for decades. It’s worked fine until a few months ago, wasn’t even playing it at the time. Anyway the first channel still works spectacularly, but the bright channel with the reverb/trem(phasor) thing isn’t passing any sound. Well, the reverb tank still makes a ruckus if you give it a smack, but nothing passes from the inputs. I mostly used this channel, so it’s a bit of a bummer. Anyone seen this?

Thanks

lmv Sun, 04/12/2020 - 17:27

Hello,

IC 2 is the Op-amp in CH2 - it may be defective or there is a bad connection, could even be dirty IC socket. I would start by swapping IC1 and IC2 and see if the dead channel is now CH1. If so, you have the solution.

Cheers,
Lars Verholt

Dhennessy Wed, 04/22/2020 - 20:48

Cheers Lars! Easiest repair ever. I had some TL072’s laying around, so I swapped it in and channel two came right back to life! Thank you so much!

Unsubscribe from this forum topic