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Vintage threads from the first ten years

Can I interchange EL34's with...

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4/18/2000 4:29 AM
bronco	Can I interchange EL34's with... Hey does anyone know if EL34's are interchangeable with KT88 or 6550 tubes? This is the most knowledgable and helpful site I have found on the net. I appreciate it being relative new at servicing my own tube amps.

4/18/2000 12:08 PM
Tim C.	Bronco, Yes you can interchange them, but ONLY after rebiasing the amp. Tim C.

4/18/2000 2:00 PM

EL34's to 6550 conversion;

1.) Locate the 47K resistor above the bias pot and solder another 47K in parallel (across the existing resistor).

2.) Set the bias pot to max or minimum (everyone has their opinion on this).

3.) Move the Feedback tap to the 8ohm tap (it should be on the 4ohm tap right now)

4.) Install the EL34's and re-bias.

5.) Plug in and play!

Hope it helps;
Trace
PS: If you are not sure how to bias an amp (if you are forget I said anything! ha, ha) please take it to a tech who is experienced because there are things in there that will stop your heart and we want you alive!!!!!! :^)

4/18/2000 7:21 PM
bronco	Thanks a bunch man! This is still the best tech site on the net. Totally awesome!

4/19/2000 9:46 AM
Lars	Best Tech forum.. I agree, I have solved my problems by asking around here, and got replays or solutions.

4/19/2000 1:32 PM
Trace	We try hard! (ha, ha) Everyone here is really good about that I think. You can always post questions here and sure there might be one or two silly fools who will "flame" you but rest assured that your question WILL get answered (if it's answerable--ha, ha). I know everyone tries to help as much as possible here!!! Trace

4/22/2000 10:27 PM
dale	hey trace, are you the trace as in trace elliot? just wondering cuz if you are, you know someone named rick winquist don't you? or steve gunner? they played in my cover band in the early 90's and i recall one or both of them knew you. am i right? [assuming you are T.E. of course] dale

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