Friedman Small Box 50 prob on stage this wknd

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mwilson5150

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Hey there, prob with my SB50 this wknd. Trying to diagnose what may have happened so let me know what you think of this.

Headlined music festival in SWVA Saturday and amp was powered up nice and warm for several hours. Sounded great in soundcheck and for first 3/4 of set but then started fading out and cut out completely several times. The first problem was it sounded like someone was standing at the knobs and slowly turned all of the treble all the way off. It was very muted and then the volume drop occurred. Sounded like someone was slowly turning the volume knob down until it went off completely. Was completely silent for prob 10 secs... mid-song, kept going and crossing my fingers and then after about 10 secs, the volume swelled back up to full and sounded fine. Did this pretty consistently for final three songs of set. Nearly stopped to switch over to a backup head and then it kept fading back so I kept thinking that would be the last time but it wasn't. Btw, volume never even made it past 3 on stage so I wasn't goosing amp at all. Never heard any crackling or popping or even strange feedback. Just the treble mute, followed by volume drop.

Running 16 ohm Marshall 4x12, GT50 Line 6 guitar wireless units. Switched guitars (each guitar had sep wireless transmitter) and it did same thing with different guitar and different wireless. Wasn't far away from pedalboard at all so range wasn't an issue. Battery check also showed fine.

I've since returned from gig and set it up again to try to duplicate without changing any batteries or anything and it hasn't done it again yet. I've checked the fuse and it's not blown. Tubes are secure in their sockets and don't appear smoked.

Only other thing I can possible imagine could be involved other than amp is my pedal board power supply. It's a VooDoo Lab PedalPower 4x4. Figured if that would overheat it wouldn't come back but it's functioning fine now.

Any ideas, suggestions?

Thx -Mark
 
Sounds like a power issue on stage not necessarily the amp...
 
Agree with likely stage power prob... amp's been on 12 hrs now, and I can't replicate it at home.
 
Maybe a bad cable? Or if you were using the loop I've had a similar issue where the cable popped out just enough to make a bad connection... May be why you're not able to duplicate the issue?
 
And of course check the tubes - you need to get them tested :)

Start with the preamp ones then the power tubes.
 
mixn4him":2a8l7ebc said:
Sounds like a power issue on stage not necessarily the amp...

This. I would look into a voltage regulator for live use as well. Some venues just aren't reliable.
 
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