Print Page - Woodstock GX-55R SS Amp

Title: Woodstock GX-55R SS Amp
Post by: argenta on April 30, 2020, 10:59:16 PM

G'day all. I come from the South Coast of NSW. I repair all things electronically musical - guitar amps, pedals, sound desks, stereos and so on. So I have a Woodstock in the shop with no sound. Tests reveal the output MOSFET to speakers is kaput.
I haven't got any circuit diagrams or tech info to work off, so working without a net here...
What I am looking for is the specs for this 5 pin output MOSFET - yeah, no markings on the bad boy!
Really flying without instruments!
Any ideas?
Thanks :tu:

Title: Re: Woodstock GX-55R SS Amp
Post by: Jazz P Bass on May 01, 2020, 01:14:59 AM

5 pin Mosfet???
Sanken made 5 pin darlington output transistors.
The one that comes to mind is SAP09.
There also was a 15.

Title: Re: Woodstock GX-55R SS Amp
Post by: dmeek on May 01, 2020, 11:29:10 AM

Please post photos of the circuit board, both sides.

Title: Re: Woodstock GX-55R SS Amp
Post by: argenta on August 13, 2020, 06:51:31 AM

For some reason I can't post the photos. It keeps telling me there's an error - file of the same name uploaded. Most off-pissing.
>:(

Title: Re: Woodstock GX-55R SS Amp
Post by: Enzo on August 13, 2020, 01:07:13 PM

Sounds like someone already uploaded a file with the same name as you want to use. Try renaming your file first., or resave your file under a new name and upload that.

Title: Re: Woodstock GX-55R SS Amp
Post by: joecool85 on August 13, 2020, 01:33:51 PM

Quote from: Enzo on August 13, 2020, 01:07:13 PM
Sounds like someone already uploaded a file with the same name as you want to use. Try renaming your file first., or resave your file under a new name and upload that.

That's exactly it, just need to rename your file before uploading. :dbtu:

Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Amplifier Discussion => Topic started by: argenta on April 30, 2020, 10:59:16 PM