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RE: 6DE7 power tube substitutes?

"1) Are there any tubes types that can be used as a direct substitute to the 6DE7?"

None I know of, although the 6DR7 isn't too far off. The 6DR7 has one section that is identical to a section in the 6DE7, but the other 6DR7 section has about 4X the mu of the corresponding section of the 6DE7. They pinout identically and have the same heater current draw though.

"2) If not, should I search for certain brand/year for these 6DE7s?"

I doubt there is much of a "database" out there on this tube. I have some different varieties on hand; if you want to drop me a note I'll look and see what I have. You'll need to do some experimenting on your own I suspect. Fortunately the tube is cheap.

"3) What exactly does a power/driver tube do? Does the type of tube I use make a difference in SQ?"

The driver tube provides adequate current and voltage to the power putput tubes. I don't know what you mean by "SQ", sorry. Sound quality maybe??

I'm assuming the 6DE7 is being used as a driver and power/output tube in your amp. One tube section is doing the driver job, the other is the power amp section. But without a schematic or more info that''s just a (hopefully educated) guess.

"4) Which tube change - rectifier or the power tubes - would make a bigger change in SQ?"

It depends, and really only some experimentation will give you the answer.


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