#1
I was thinking about re-tubing a head ... it can only be switched to 6l6 (power amp), so I was wandering if it were actually possible to retube it to something else?

I was going to try: retubing a Peavey 3120 (which sounds great already) to something like: power amp: 6550 (original tubes are: EL34's).
Yeah. But the same can be said for DAR amps and other amps which use "weird" tubes...dammit I want a pair of KT120s..I might blow up my amp and burn my house down, but at least I'll go out in a blaze of glory
Last edited by C_majzer at Sep 9, 2010,
#3
There are a few substitutions you can make (I can't remember off the top of my head) but in general, no.
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#4
Yeah, 6L6's will fit in the EL34's socket, also the KT66's work in the same sockets, only thing is re-biasing the amp. One more thing, the KT66's are have a wide bottle on the tube, so if your tubes are spaced really close together then they prolly wont fit.
#5
6550s are just another name for KT88s (so I'm thinking no, don't do that)

6CA7 and KT77s are derivatives of EL34s (so I'm thinking maybe)

I would just send Peavey and email and ask them what is acceptable and what the recommended bias would be.
#6
Quote by 311ZOSOVHJH
6550s are just another name for KT88s (so I'm thinking no, don't do that)

6CA7 and KT77s are derivatives of EL34s (so I'm thinking maybe)

I would just send Peavey and email and ask them what is acceptable and what the recommended bias would be.


As long as the pins are the same I don't see why not.
#7
Quote by ethan_hanus
As long as the pins are the same I don't see why not.

There is more to it than just the pins. Different tubes draw a different current. I'm not saying you can or you can't, my recommendation is to contact Peavey instead of guessing. If I wanted to throw KT88s in my EL34 amp for example I would have to perform a simple mod of replacing a resistor and rebiasing the amp - but I don't call that 'plug n play'.
#8
generally no.

To get optimal tone you will generally need to use the tube the amp was designed for. Will also want to pick up a matched set (for power tubes), and also tubes of a certain grade.

Certain exceptions do exist, such as in the case of amps that have been designed to be switched between 6l6 and el34 (My carvin legacy has a switch for this), and similar tubes such as a switch between EL34s and E34Ls (This is will require a rebias).
#9
has anybody heard of any company having the ability to obtain some kind of "custom shop" or just simply being able to make a custom amp head if requested??
Yeah. But the same can be said for DAR amps and other amps which use "weird" tubes...dammit I want a pair of KT120s..I might blow up my amp and burn my house down, but at least I'll go out in a blaze of glory
#10
My Triple X, the 3120's predacessor has a bias switch for going from 6l6 toel34. yours might too.
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