No sound from RockerVerb 100 Head

[jayques]

Hey guys so I was playing this morning for about and hour everything was great, awesome orange tone as always. Then my delay started screwing up on me and I think it sent voltage into my effects loop. Needless to say both fuses were done, all the tubes still glowing, no burning smell, changed the fuses, and still no sound. What's wrong with it?

[g1]

The delay shouldn't really be able to damage the amp, unless it had a real serious melt down. You said both the fuses were "done", do you mean the output valve fuses were both blown? This usually means the power tubes are bad and need replacement. Usually the fuses prevent further damage to the amp but not always. Have the fuses blown again? Make 100% sure you speaker cable and cabinet are working. If not, running a tube amp without a load can do serious damage.

[jayques]

The cab and cable are fine, I always run a cable when its powered up. Yes they were the output valve fuses, it just seems really strange that the problem occured with the delay, what could happen to the amp if voltage came through my effects loop from the delay? And the tubes were changed and biased two months ago, I can't see them going that fast without at least some sign before total failure.

[Chuck H]

How did the delay "act funny"? (I'm hoping for a Rodney Dangerfield impression... Hey, I tell ya'... The last time I heard that was a hundred milliseconds ago. (pull shirt collar with index finger)

Seriously though, the delay acting funny could have been a consequence of the amp telling it to. Or just the way the amp reproduced what the delay normally does. So, how did the delay act funny?

There's almost zero chance of anything the delay could do damaging the amp. Need more info on what happened.

[jayques]

Ok, I walked to my amp and started hearing this really loud noise, tried turning the amp on and off a few times, everytime I turned it on it made that sound. Then I looked at my pedals and turned the delay off and noise went away. Looking back it actually sounded like a delay oscilating it's effect extremely fast, the delay was running through my effects loop. Everything worked fine after as far as the amp goes, same volume good sound. So I went back to my delay pedal, unplugged it, power that is (no batteries inside). turned it on again and same issue, there's a controller switch for presests and when I used the switch the noise changed slightly and varied in volume, after a few seconds of playing with the switch my amp went and here I am now.

[J M Fahey]

Ok, I walked to my amp and started hearing this really loud noise, tried turning the amp on and off a few times, everytime I turned it on it made that sound.

Obvious. When you turn amp off you hear no noise, nor anything else.

Then I looked at my pedals and turned the delay off and noise went away. Looking back it actually sounded like a delay oscilating it's effect extremely fast, the delay was running through my effects loop. Everything worked fine after as far as the amp goes, same volume good sound.

So you turned your delay off, noise stopped, pull it out of the equation.

So I went back to my delay pedal, unplugged it, power that is (no batteries inside). turned it on again

*What* did you turn on again: the pedal, the loop or the amplifier?
*If* you refer to the delay, how can you turn on something unplugged from its power supply and with no batteries inside?

and same issue, there's a controller switch for presests and when I used the switch the noise

*What* noise?.
You had already turned the delay off; even unplugged its power; you said "it has no batteries".

the noise changed slightly and varied in volume, after a few seconds of playing with the switch my amp went and here I am now.

Repeat, what noise are you talking about, the one not produced by your turned off and unpowered delay?
Please explain better or we wonīt be able to help.

[jayques]

Sorry, I plugged the delay back in right after I unplugged it.

[Chuck H]

I don't think the delay unit was the problem. If the "noise" happened with no power to the delay then obviously the delay was not contributing to the problem. I think you have a failure in the amp that causes noise when you activate the effects loop and the repeated loud erratic signal could have caused a weak power tube to fail and take out the fuses.

[jayques]

Sorry guys, the delay was always powered up and the noise only occured when the on switch was enabled with the delay powered up.

[Chuck H]

Then perhaps the failing effects unit, causing the amp to make repeated loud noises, did take out a weak power tube that poped fuses. If this did happen there is a good possibility that other components besides the power tube/s and fuses were damaged. It's important to note that the delay itself is very unlikely to damage the amp. But rather the delay caused the amp to damage istelf.

[J M Fahey]

Try to get your ampīs schematic so me can suggest some specific tests.
Your power stage might be dead (blowing tube fuses is not a minor failure) , be it dead/shorted tubes, burnt tracks/sockets, burnt open screen resistors, dead output transformer, you name it.
*or* it might have survived, but your SS effects loop died , muting the amp.
Yes, many so called "all tube" amps have quite a few SS parts built in .... even more a "modern" Orange one, which only shares the skin colour and some very cool graphics with the British glories of yesteryear.

EDIT: I got the Rockerverb 50 schematic, I think itīs close enough.
Sorry, no SS effects loop there but an ECC81 driven one; *very* unlikely to be damaged by any pedal , so .... it looks like itīs something at the power stage.
The output tubes seem to live in their own PCB, connected to the rest of the world by two 10 pin connectors (flat cable?) and a few extra individual ones, check that they are properly seated.
The output tubes might have lost bias and overheated.
Anyway, unrelated to the effects pedal connected at that point by sheer chance.
The Orange Amp Mods page

[jayques]

Ok, so if my effects was just picking up a signal from the effects loop crashing and just delaying the signal that would make sense why the noise would go away when I turned the delay off since my pedals are true bypass.

[jayques]

Also, is it possible that something through the amps effects loop went through my delay to cause it to fault? Cause I still have the delay issue to solve.

[J M Fahey]

Cause I still have the delay issue to solve.

*What* delay issue to solve?
You speak in riddles.

We are talking about a dead >>>Amplifier<<< here, the one that

Needless to say both fuses were done, all the tubes still glowing, no burning smell, changed the fuses, and still no sound. What's wrong with it?

[Chuck H]

It's probably the output transformer

Just kidding. Someone is going to have to open the amp up now. If you don't want to then take it to a service technician. If you do want to, do you have a digital multi meter? No point in opening it up unless you have one since you'll need the meter to answer future questions.