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In Reply to: RE: 6922 to 6SL7 posted by Rikkitik on September 14, 2020 at 08:42:28
There was a recent thread on UK site HiFi Wigwam where a guy put a lot of money into boutique 6SN7s plus adapters and 6N30 tubes for a piece of equipment designed for 6N6P tubes. He hadn't even tried the 6N6P tubes that came with it. He'd just read somewhere that 6SN7 tubes were "better" so should sound better in his equipment. Of course they didn't. In the end he put the 6N6P tubes in and surprise, surprise, they sounded the best.
It may well be the case that you can "design" a better sound. But do it the right way - teach yourself tube technology and then design the circuit correctly. If you don't understand the circuit how can you modify it? Plenty of tube tutorials and books available. Something to do over the winter if you love tubes.
Follow Ups:
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 09/15/20
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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