switching tubes in marshall kk head?

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cujo

cujo

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I blew a kt88 in my Kerry king Marshall can I just put in el34 I have a full set ...and just rebias? If so were is bias point in this head?
 
No, you need another quad of KT88's & a bias, that would be the smart thing to do.
 
That's not my question I want to put el34 inKK how do I do it?
 
You need to change out the bias resistor. I doubt you can get the bias in the right range for EL34's without a resistor change.
 
I actually have a blown 1amp fuse..will that cause the one tube to not light up n amp not play?
 
A blown fuse is a sign of a bigger problem than a fuse. :no: :no: :no:
 
Amp was in a very cold room...I plugged it in to warm up but didn't realize standby was on I plugged in speaker n POP...that's how this occurred
 
OUCH. :doh: :doh: :doh:

Your looking at tubes & a bias minimum, since they only sell power tubes in pairs or quads.

If you want 34's in there you have to have a tech install a bias range resistor and maybe change the screen grid resistors with a bias, plus tubes, [not sure about the grid resistors.]

I've not known anyone to put EL-34's in a KK Marshall, not saying it can't be done, but you gotta put it on the bench.
 
You said you lost a tube right? If it were my amp i'd have my tech check it out, either way it's gonna cost you money.


You cant just throw any old tube in any amp, doesn't work that way with tube amps.
 
Pop in a new fuse and give it a try. If it works, great! If not, try this - you can pull either the inner pair or the outer pair of tubes to test the amp. You must then drop your impedance selector down to 1/2 the cabinet's impedance rating (use the 8 ohm setting for a 16 ohm load and the 4 ohm setting for an 8 ohm load). This can help identify if the amp is damaged or just a tube problem.
 
usajackson":24plh7y7 said:
Pop in a new fuse and give it a try. If it works, great! If not, try this - you can pull either the inner pair or the outer pair of tubes to test the amp. You must then drop your impedance selector down to 1/2 the cabinet's impedance rating (use the 8 ohm setting for a 16 ohm load and the 4 ohm setting for an 8 ohm load). This can help identify if the amp is damaged or just a tube problem.
Click to expand...

+1
 
I put fuse in it popped w 88...put in a set of el34 put another fuse in and no problem ....bad tube tripping the fuse?
 
Indeed a bad tube. I wouldn't run the ELs very long. The amp is setup for 88s and I think a few resistors need to be changed to handle the ELs?? Good news is the amp is fine and the fuses did their job by blowing and not allowing the bad tube to damage the amp! :thumbsup:

Maybe the amp is just missing the McNaught?
 
You need a retube and a bias which is what i said yesterday, are you getting that?
 
Ha ha the mcnaught is sitting on my fiancees finger...I never really bonded w that guitar...I enjoyed playing my 1k dean soltero more...I did pick up a schecter Dan donegan model..awesome guitar...gonna sell Kerry king now...got a wedding n i think I'm gonna pick up the eleven rack to replace KK.
 
The McNaught is sitting in my son's room. He loves it when he comes home and plays it. Good luck with everything.
 
It won't hurt the amp to have the el34's in there but it is set up for kt88's. The bias resistor is not the only change that is made in order to switch back and bias the el34's correctly. The el34's are probably running super cold. I would say if anything, order a pair of kt88's and just replace the bad tube with 1 from the pair. But the same brand that came in the amp, probably sovteks. that's the easiest solution, or if you have the bread, buy a new quad of kt88's. Switching back to el34's is more complicated than just putting them in the amp, there's a process to set the amp back up for those tubes. Also, I would say that turning the amp on with the speaker unplugged is definitely the problem, not a cold room. I think most of us have made that mistake or at least some of us.
 
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