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Blew both fuses last night
Post by nickyboy on Mar 11th, 2016, 03:06am

Rehearsing last night...at a fair volume 5/6.
Slo100 and matching 4x12.
eventide delay thru the loop
ada flanger, rmc wah, mxr dist+ in line.
jackon rr1

Bout 20mins in to rehearsing..mid solo and then silence.
Did usual lead checking, unplugged all fx..nothing.
All power tubes looked fine..no crazy glowing etc.
Powered off, checked fuses..both had blown..one had shattered and I needed a needle nose plies to get it out.

One of the band members had a teeny little solid state Crate mini amp..so used that for the rest of the rehearsal - although I must've had a face like a smacked arse for the rest of the evening!!

Got home, wife and kids in bed - but I couldn't wait to troubleshoot..so changed the power tubes for an old set that work but are old...changed fuses (obviously!)..powered up - fine!
At least "fine" at super quiet levels..

I'd been using Harma 5881 small base power tubes..
The replacement tubes are sovtek 5881 big base tubes.

Any thought on this? I'd hate for it to happen mid gig.



Re: Blew both fuses last night
Post by ryanmichael95 on Mar 11th, 2016, 05:05am

Good on ya for changing the power tubes. I had a JJ tube short in my HR 50 and it took out the output transformer. It should have blown a fuse, but for whatever reason the path it took was straight to a winding in the transformer. I too have gone back the the Sovtek tubes.
Re: Blew both fuses last night
Post by nickyboy on Mar 11th, 2016, 06:00am

It's worrying when it happens! That's for sure.
The weird thing is that the tubes looked absolutely fine when it happened...
I guess the only other thing could've been some sort of power surge??
Re: Blew both fuses last night
Post by mantrasky on Apr 24th, 2016, 8:07pm

I've had mine blow, and it's something that Many people seem to have problems with?
Re: Blew both fuses last night
Post by nickyboy on Apr 25th, 2016, 06:17am

I suspect it was a dodgy output tube.
I've changed all four output tubes...and fuses obvs.

The 2 inner tubes looked more worn than the outer two.
The logo/paint was more yellowed - as if it was aged thru heat.

So far so good.
I used sovtek 5881 big base tubes.
I'd like to learn to check bias.


Re: Blew both fuses last night
Post by ryanmichael95 on Apr 25th, 2016, 6:16pm



If you'd like to learn to bias, just search this forum. Some here including myself have explained in very fine detail how to do it, and do it well. Good luck!