Yamaha G50-210 Amp Problems With Static

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Stringmusic1983
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Yamaha G50-210 Amp Problems With Static

Unread post by Stringmusic1983 » Sun Mar 03, 2019 5:52 pm

After getting help from Buzzard with my footswitch and settings, I tried "dialing in" my new to me G50-210 amp. (I had previously tried it out for about 5 minutes after buying it just to find out what it sounded like in general, etc, and switched it off. Did not have time when I bought it and trust who I bought it from at a good price.) So, "dialing it in" was the second time I switched it on and after roughly 2 minutes I get no output from my guitar ( other than 2 times I got a couple of seconds of guitar output ) and nothing but static otherwise from the amp. Regardless of the settings, including turning the volume completely off, I still have static. When I switched it off it continued to send static through the speakers until all power has dissipated. I will speak with the seller about it soon but am wondering if this is something simple that I am overlooking ? I checked the fuses and they are good. Tried my guitar through a different amp using the same cable and all is good. I tried a third time, after letting it cool off completely, thinking something in the chassis heated up within the 2 minutes of the second try and opened up to kill the guitar input. However, to start this third time, I immediately switched it on and strummed to silence. Then the static came to life in roughly 2 minutes. Thanks in advance for any help I can get !
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Buzzard
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Re: Yamaha G50-210 Amp Problems With Static

Unread post by Buzzard » Sun Mar 03, 2019 9:12 pm

Arrrgh , Sorry to hear that the amp is acting up, giving you a hard time. :(

Now this could be a case of one or more of the old electrolytic capacitors giving up.
The parts won't cost that much if you can change them yourself.

BUT, before going that far, check all the little things.

*You get static noise, so at least your speakers work,
not sure about the power amp, but some sound slips out to the speaker.

*Do you get the same static, and no guitar sound in both high and low inputs ?

*With only cable plugged in (no guitar) adding a tiny bit of volume,
touching center of the jack where the guitar used to be,
do you get the usual hum ?

*On the back of your amp is a "REC/Signal Out"
If you connect from there to the input og another amp, do you still get static noise ?
If you do, the preamp is likely the be the culprit.

Even with the service manual in hand, this job requires a fair amount of knowledge of electronics repair.
Before going all in, consider how much you want this amp to become a player,
and how much time and money you want to spend to make it happen.

Regards
Peter
Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:
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Les Turnbull
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Re: Yamaha G50-210 Amp Problems With Static

Unread post by Les Turnbull » Mon Mar 04, 2019 3:41 pm

Dose it have effects loop sockets , corrosion of these sockets can stop sound passing to the amp section , Try a patch lead from send to return .
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Stringmusic1983
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Re: Yamaha G50-210 Amp Problems With Static

Unread post by Stringmusic1983 » Wed Mar 13, 2019 3:58 am

I'm sorry for such a delayed response. The static was present in both the high and low input. There was no hum when the cable was touched. The static was present in both amps when connecting two together. Unfortunately, there is no effects loop on this amp. Based on the troubleshooting guide above, I returned it to the seller and swapped it for another amp of a different brand. I agree with Peter's advise and decided not to get deep in repair cost relative to the overall value, especially since I am not skilled at electronics. I hate it didn't work out as I was looking forward to playing through it. Many thanks to Peter and Les for all of your help !
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