8mm Forum: More GS-1200 Woes

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Posted by Evan Samaras (Member # 5070) on October 01, 2019, 08:30 AM:

Hello everyone,

As I was set to re-record a stereo track through my GS-1200 & computer, I noticed a huge discrepancy on the Left channel Aux In vs the Right Aux In. My computer set to max volume, and the Left Aux set to max, and I still couldn't get passed 10db on the GS Meter. I had to set the Right Aux in to 1/4 of the volume only to match the left and right channels.

I switched out my cables and still had the same problem. I reversed the cables, and still the same. My settings were as instructed in the manual: Normal Record (as opposed to double), Stereo, No ALC (I even tried with ALC).

I am also noticing a huge drop off in volume when changing between Mono to Stereo in general now. Is there an amp that may need replacing? When turning on my GS I am also hearing loud white noise for a few seconds before it clears.

Thank you! in advance!

Posted by Thomas Knappstein (Member # 6134) on October 04, 2019, 07:54 AM:

Hello Evan!
You need a bottle of Contact Cleaner Spray. There are two Swiches beind the Cover where the the two VU Meters are in. They swich the Amplifier from playback to the record Mode when you push the red recod buttons and the red LED is going on. Behind this Cover are two Boards beneth to each other. You must lie the Elmo on the rear Cover and you can see the Swiches beneth the two boards.

For the huge Drop when swiching from Mono to Stereo, chek the two Speakers in Stereo Mode. If there is one dead when playing Sound on both Tracks it could be the STK 439 Power Amplifier is failed on one Channel. I had the same Problem and changed this Part. After that everything was ok. When you swich into mono Mode the Sound of one Track 1 or 2 will be give out on both Speakers.

Posted by Evan Samaras (Member # 5070) on October 04, 2019, 11:12 AM:

Thank you for the information Thomas!

Around one year ago (I think) I replaced the Capacitor in order to achieve better re-recording results. It sounds like I have to go back in the same way!

I am not sure both speakers are dead, although one might feel close to it. I will definitely investigate further this weekend. I've never had to swap out that type of amplifier. Would you say it's a fairly easy job?

Thank you again! I will report back soon!

Posted by Thomas Knappstein (Member # 6134) on October 04, 2019, 11:42 AM:

No, it`s not an easy Job. you need a solder Pump and a good solder Iron with regulating Temperature. If the Joints are getting to hot, they will come up loose from the Board.

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