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Post by bryan0418 on Jun 9, 2013 18:33:20 GMT -7
I am loving my Remedy with the master volume and EQ bypass features.
I want to get a backup set of output tubes as well as a backup phase inverter. This is my summer go-to gigging amp and I want to be prepared should a tube fail.
I know the Tung-Sol 12AX7 is the stock Phase Inverter tube. My question is "Does the PI tube need to be balanced or matched or does it not matter?"
Thanks Z Brothers & Sisters.
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Post by Deleted on Jun 10, 2013 0:41:27 GMT -7
I asked our resident tube expert the same question awhile back. This is what he had to say. Balanced is the way to go for PI/starter tubes. Matched is the way to go with output tubes. Would you recommend one test (matched or balanced) over the other? Matched as offered by Doug's is only $2 extra dollars a tube. Balanced can be as high as $16 dollars a tube. For phase inverter use in amps with the most common long tail pair design I would go for balanced triodes and each triode drives half of the output tubes in a quet or quad. Matching that tube to any of the others has no benefit. Where matching tubes to each other would be of benefit would be in high end audio gear where one might want the stereo amp to be equal on both sides or monobloc amps to match. No reason to match tubes in a guitar amp that I can think of. Even if you wanted two guitar amps of the same make and model to match level this would be accomplished via the volume knob or amp placement. The +/- 20% range of most of the parts used would make matching tubes to match the amps performance, level and tone impossible by trying to match tubes alone.
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Post by Telemanic on Aug 3, 2013 21:13:15 GMT -7
Definately I've found a balanced PI to make the amp have better balance and sustain. But I also try some varying tubes as well and let my ear guide me as well. I think with perfectly balanced you can get some phase cancellation of some harmonics on the power tubes. Sometimes a little quirky pull creates a little magic, lol. Like the little swirl you hear in some old vintage amps when cranked! I'd have to defer to Myles on this tho, but this is my limited understanding of such things, - Lou
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