diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   Yorkville 400B Bass Head Repair Help (http://www.diyaudio.com/forums/solid-state/138992-yorkville-400b-bass-head-repair-help.html)

cm961 20th February 2009 02:47 PM

Yorkville 400B Bass Head Repair Help
 
I've got a Yorkville 400B that stopped working recently. It served me great for many, many years until some drunken fool from another band knocked it off a stage (and didn't apologize). Pretty rude if you ask me since he showed up without a bass amp in the first place and assumed he could use mine. Anyway enough rambling.

The head took quite the spill. It's got a permanently attached power cable which was yanked on. The grommet came out and the connection terminal to the circuit board was tugged on. I took it apart and resoldered that and it worked for a gig or two. Now it doesn't again.

It's very quiet, and the sound is very distorted. It's almost like a flanger type sound making single notes sound out of tune.

It took quite the physical jolt so I'm wondering if some transistor legs got snapped or something.

It's a class B amp I'm sure, and luckily came with schematics.

http://cid-39cfa1a69dcb5e03.skydrive...20Part%20A.jpg

http://cid-39cfa1a69dcb5e03.skydrive...20Part%20B.jpg

I've repaired a few amps (mostly car amps) over the years, but not for awhile and also this amp has got to be fixed so if I can't fix it myself I'll hand it to a shop. I'm sure there are some easy things I could check before hand though. Any ideas?

Thanks,
Pete


edit: my links didn't work. I'll try to attach.

Schematics


All times are GMT. The time now is 03:26 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2