Retubing Engl Head

Pies · 10th January 2012

Hi,

My Engl fireball has got really really noisy over the past couple of months so I think its time for a retube. 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 retubing them.

So my question is can I retube the amp myself easily?
I have changed the tubes in pres and compressors in the past but I have never retubed 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,

drbob1 · 13th January 2012

You can simply replace preamp tubes as desired. The power tubes should be biased, which means taking the top off your amp and not killing yourself. Maybe check at the Engl forum to see if there's special precautions, otherwise buy a Weber BiasRite and turn the pot till the voltage/current matches what it needs to be...

DaveUK · 14th January 2012

Weber Bias Rite Alert!! - Marshall Amp Forum

went to check out the weber then bumped into this

10th January 2012	#1
Pies Gear addict Joined: Jun 2007 Location: UK Posts: 352 Thread Starter 2 Reviews written	Retubing Engl Head Hi, My Engl fireball has got really really noisy over the past couple of months so I think its time for a retube. 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 retubing them. So my question is can I retube the amp myself easily? I have changed the tubes in pres and compressors in the past but I have never retubed 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, __________________ Loud Noises Studio Web: www.loudnoisesproduction.co.uk Facebook: http://www.facebook.com/LoudNoisesPr...ecordingStudio Twitter: @LoudNoisesPro

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13th January 2012	#2
drbob1 Lives for gear Joined: Nov 2009 Posts: 1,420 3 Reviews written	You can simply replace preamp tubes as desired. The power tubes should be biased, which means taking the top off your amp and not killing yourself. Maybe check at the Engl forum to see if there's special precautions, otherwise buy a Weber BiasRite and turn the pot till the voltage/current matches what it needs to be...

14th January 2012	#3
DaveUK Lives for gear Joined: Mar 2008 Location: newcastle upon tyne Posts: 916 1 Review written	Weber Bias Rite Alert!! - Marshall Amp Forum went to check out the weber then bumped into this