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Revalving Engl Head

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Revalving Engl Head

Postby crazy_ow » Tue Jan 10, 2012 2:08 pm


My Engl fireball has got really really noisy over the past couple of months so I think its time for a revalve. The only problem is my tech has left town and I don't know anyone else I trust or who hasn't messed friends amps up revalve them.

So my question is can I revalve the amp myself easily?
I have changed the tubes in pres and compressors in the past but I have never revalve an amp. It's the biasing that concerns me if I change out the power amp tubes will my head need to be rebiased?

I think while I'm changing the power amp tubes I'm going to also swap out some of the pre tubes to try and get a bit more mid out of the head and a little less bottom end. Its my understanding that I can just change the pre amp tubes without rebiasing is this right?

Its the 60w Engl Fireball E625 head I have,
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Re: Revalving Engl Head

Postby 4TrackMadman » Tue Jan 10, 2012 5:00 pm

Write Engl and find out the type of head that you have, some of them are self biasing so if you buy the same tolerance (matched) tubes you should be ok to revalve yourself. If you need to bias it - you can purchase an amp bias kit and DYI or wait for a tech.
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Re: Revalving Engl Head

Postby Folderol » Tue Jan 10, 2012 6:30 pm

It's very unlikely that becoming noisy is due to output valves.
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Re: Revalving Engl Head

Postby russ123 » Tue Jan 10, 2012 10:50 pm

Give Watford valves a call and get their view too............
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