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In Reply to: RE: Refubishing old Sherwood S-5000, need schematics posted by Eli Duttman on March 02, 2017 at 18:05:58
"I suggest you rewire the sockets to take 6BL8s/6GH8s/6U8s, without changing parts values. The 3 types are pin compatible and any 1 of them will do. FWIW, I prefer the 6BL8."
Or......You can do it the easy way......
Stay calm and return fire.
Follow Ups:
I've had mixed results with adapters for the 7199, with new/NOS tubes, of a couple different types. In one case, I got really bad distortion on both channels that didn't follow the tubes + adapters to another set, and went away when I put the 7199s back.
IF I hadn't been stockpiling 7199s for a few years, I'd be much more amenable to using these and making them work, but based on mixed success, I'm glad I don't have to!
There's nothing horribly wrong with the adapters. However, the 7199 has gone the way of the Dodo (extinct) and rewiring presents a golden opportunity to install new, mica loaded phenolic, sockets. I like reducing the mechanical connection count, if feasible.
Eli D.
Eli;
Your post about rewiring tube sockets to accept readily available tube such as the 6BL8 jarred my memory, so I went on a reconnaissance mission into my tube supply.
I came up with 28 of these n.i.b.
Can I use them in the adapter sockets previously posted?
Stay calm and return fire.
You certainly can use those nice 6BL8s in your adapters.
28 of 'em, you say. Methinks you could sell several, for some $, and still have enough to last the rest of your life, while helping other enthusiasts in keeping their equipment functional. Also, 6BL8s are the O/P tubes in McIntosh MR-67 and MR-71 tuners. ;> )
Download and cross compare the data sheets for the 6BL8, 6GH8, and 6U8, from Frank Philipse. http://www.tubedata.org/
Also, check out the schematics for the Scott 233 and 299C regarding interchangeability of the 3 types.
Eli D.
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