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In Reply to: RE: Tube adapters are no substitute for design. posted by andy evans on September 14, 2020 at 15:20:29
Oh well, I guess I didn't expect a summary dismissal.
Anyway, please read no emotion, sarcasm, or ingratitude into my response.
The circuit in question is an srpp, driving a 47k load. My understanding is that the load is an integral part of the srpp circuit.
I own, and have tried, quite a few NOS 6DJ8/6922, the Holland Amperex are nice, but I like the genuine '75 Reflektor 6N23p a bit more, (I suspect it has a bit of 2nd harmonic as strings are somewhat on the "sweet" side). So, it's not for lack of trying on my part.
The 6SL7 idea was an inexpensive experiment (at first). It would have been really inexpensive if 6SN7's would have worked, I have a box full of all manner of those. So, $24 for a pair of adapters, $50 for a good pair of Sylvanias 6SL7's.
The Sylvanias sounded very good, but.....
Tung Sol BGRP's, brown base, (6SU7GTY's actually) are not obscenely priced. So, why not? And, as it turns out, sound fantastic in this circuit, as is. Top to bottom, "sounstage", decay, layering, simply beyond what I would have imagined. And, by way of just an oddity/comment, they run extremely cool to the touch. 132 degrees after 2 hours listening (says the IR gun).
Yes, I will learn more about circuit design. I just thought I'd ask a question.
Thanks - Rick
Edits: 09/15/20 09/15/20Follow Ups:
Hi again. What I was doing was encouraging you to learn a bit about tube circuits so you could avoid adapters. This is useful in many ways - less expense, less clunky, better contacts in a proper socket.
For instance it's not difficult to substitute a loctal socket for an octal one. This allows you to use cheaper tubes in many instances. The holes in the chassis should be roughly the same. Not so easy if you want to use an octal tube in a 9 pin socket, though.
So I guess you could start with adapters. But if you have the time and motivation, move closer to understanding how a circuit works. Quite a long-term project since you need to be safe with high voltages, but many of us have embarked on self-education about tube circuits. It's not for everyone, but it's an option.
Thanks Andy, sorry I misinterpreted your post. Though I did take your suggestion. I've been reading a bit on TubeCAD.com. I do have "passable" soldering ability, as well as respect for "high voltage". Before retiring, I was a Generation Technician at a 100Mw "Peaker Plant". So I have at least a primer in electrical theory.
I appreciate the encouragement.
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