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will it cost to retube a jcm 900 head? ive been offered one for 700 but it definately needs to be retubed the seller says
 

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sesroh said:
100 watt head model 4100
I would start with replacing the power tubes only, since pre-amp tubes generally last much longer in a guitar amp. You will need to get a quad of EL-34's which could cost anywhere from $50 - $100. You'll also need to get the amp biased if you are not able to do that yourself...might be looking at a $30 - $50 bench fee there too (I do my own tech work, so am not really up on those costs)

If any or all of the pre-amp tubes need to be replaced then you are looking at $10 - $15 per tube. I beleive there are 3 12ax7's in that amp.

Worst case looks like about $200.00 assuming you don't want to put pricey NOS tubes in there.
 
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