50+ problem

DC-2, 3, 5, 10
50 Caliber

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Bobby Marshall
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50+ problem

Post by Bobby Marshall » Fri Jan 23, 2009 10:47 am

My buddy just picked up a 50+ and found out it is not operating properly.

After 30 min or so the volume just completely cuts out. It comes back if he puts on standby for a second and back on or just turns off and on it comes back.

Anyone know what causes this?

Thanks,

Bobby
"Be excellent to each other." - Bill and Ted

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Old BF Shred
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Re: 50+ problem

Post by Old BF Shred » Fri Jan 23, 2009 11:09 am

Sounds a bit like the problem I had with my Stiletto....
A filter Capacitor in the power supply was the cause. But that may cause just a partial drop in volume.
Also a preamp tube can do this. The power tubes aren't likely the cause; both (or all 4 if el84's) cutting out at the same exact time is very, very unlikely. Also the PI (driver to the power tubes, usually farthest from the input jack) would have to have both sides fail at the same time.
This assumes it cuts out completely as opposed to a drop in volume, if I understand your description accurately.
Start with v1 and swap tubes 1 at a time. Wait long enough after each swap, to be sure the problem shows up

If it's intermittent, it can be a pain, but try to eliminate a tube problem before taking to a tech. This will save you (or your friend in this case) time and money in the long run.

Good luck :D
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citizen.one
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Re: 50+ problem

Post by citizen.one » Sat Jan 24, 2009 3:46 am

well, ive had the same problem on my cal50+. In service theyve done everything and it was for nothing. On the 3rd service control we've found, that the opto-isolator, which serves to switching channels, was damaged, so in the end, the problem was just one diod, but before it they've totaly changed every connection,so ive handwired Cal50+ :D

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#2121313
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Re: 50+ problem

Post by #2121313 » Sun Jan 25, 2009 11:38 am

Try replacing the fuse and see if that helps, they're in exoensive and easy to change. I had a similar problem with one of my amps and that corrected it.

Bobby Marshall
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Re: 50+ problem

Post by Bobby Marshall » Tue Jan 27, 2009 7:10 pm

Thanks everyone. I am forwarding this link to my bud so he can give everything a shot.

I will give an update after he has fixed or gotten through these.
"Be excellent to each other." - Bill and Ted

sliberty
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Re: 50+ problem

Post by sliberty » Wed Jan 28, 2009 12:36 pm

Did you ever solve your 50 Cal+ cutting out problem? My friend is going through the same thing now. ANy tips woul dbe appreciated.

Bobby Marshall
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Re: 50+ problem

Post by Bobby Marshall » Wed Jan 28, 2009 7:38 pm

Still waiting to hear back from my buddy. I will post once I find out if anything clicked.
"Be excellent to each other." - Bill and Ted

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Re: 50+ problem

Post by Monsta-Tone » Sun Feb 08, 2009 12:57 pm

Don't know if you've tried this yet, but put a good patch cable in your FX Loop.

Doesn't matter if you've been using it or not, try it.

Just plug it in between the Send and Return. Might not fix the problem, but if it does, at least you know what to replace.

Sometimes the jacks just crap out.
Elvis said.......
Amp techs do get shocked. :shock:

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