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Refubishing old Sherwood S-5000, need schematics

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Posted on March 2, 2017 at 16:45:00
Son of W5DYV
Audiophile

Posts: 1
Location: Texas
Joined: March 2, 2017



My dad is refurbishing an old Sherwood S-5000 (not a Mark II) and we're looking for a schematic where the small components are legible. We found a 3486x2544 GIF that's almost readable. Does anyone have a schematic they can share?

The tube set is:
(Main Chassis)
Five 12AX7's
Two 7199's
(Rear Shield)
One 5AR4
Four 6BQ5's

EDIT: We're digging through our Sam's Photofacts Binders, but haven't come up with the right one yet.
Thanks to all responders.

It's a bright beautiful world out there. Let's fix that.

 

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RE: Refubishing old Sherwood S-5000, need schematics, posted on March 2, 2017 at 18:05:58
Eli Duttman
Audiophile

Posts: 9543
Location: Monroe Township, NJ
Joined: March 31, 2000
Contributor
  Since:
January 5, 2000






The S5000 takes 7189s, not 6BQ5/EL84s, as they will "fry". For all practical purposes, "the only game in town" is the Russian 6П14П-EB (6p14p-ev), AKA EL84M. Fortunately, that variant is tough and good sounding.

The Sovtek 5AR4 will do nicely, IF the series SS diode tweak is employed. Use UF4007s, instead of the 1N4007s shown in the graphic, as that better diode will serve well in future projects.

The clean and quiet Sovtek 12AX7LPS is fine for the phono section. Either of New Sensor's "reissue" Mullard or "reissue" TungSol 12AX7, depending on the voicing preference you and your dad have, will be good in the line section. The Mullard exhibits mid-range accent and the TungSol exhibits "chime".

All of the useful small signal pentode/triode types are out of production. :>( In particular, the 7199 is (IMO) ridiculously expensive. 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.

Is a "stock" refurbishment contemplated or is something "radical" under consideration. For instance, source selection can be upgraded to remove switches from mV. level signal lines. In today's environment, tape head I/Ps are passe.

Contact AA sponsor Jim McShane for your tube and some of your parts needs.

Eli D.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 2, 2017 at 19:32:15
Michael Samra
Dealer

Posts: 35880
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
Well Mr Sands,this is the way you want to do a Sherwood s-5000.




Here is the bottom view where I use the different type caps from paper in oil to poly film.





In the corner I use a terminal strip to mount the 3 caps to take the place of the 3 section 50vdc can cap.







On top of the chassis you will see a dual 100 jj cap.In the corner you see a 35uf at 500c film cap that connects off the GZ34 rect.



73s from N8TPI

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 01:06:06
DannyR
Audiophile

Posts: 558
Joined: January 21, 2001
They sure crammed a lot in those:)

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 04:51:32
vinnie2
Audiophile

Posts: 2814
Joined: September 28, 2013
That's why I don't like receivers. Most are a %#$@ to work on if you are as dexterity challenged as I am. Damn near takes a surgeon's hands to get to some of those parts.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 07:27:52
airtime
Audiophile

Posts: 8832
Location: Arizona
Joined: February 4, 2003
I was one and I STILL sent it to Mike to restore!!!

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 07:47:15
geezerrocket
Audiophile

Posts: 44
Location: West Central Minnesota
Joined: December 2, 2016
I am listening to my S-5000 and S-2200 tuner to the Minnesota state high school wrestling championships.........With a condition called "neuroma" in my foot.

Hell, I thought gout was bad - I wish I had gout compared to this!

The Sherwood makes it more bearable........
Stay calm and return fire.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 08:13:11
geezerrocket
Audiophile

Posts: 44
Location: West Central Minnesota
Joined: December 2, 2016



"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.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 09:00:04
Eli Duttman
Audiophile

Posts: 9543
Location: Monroe Township, NJ
Joined: March 31, 2000
Contributor
  Since:
January 5, 2000
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.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 09:35:50
geezerrocket
Audiophile

Posts: 44
Location: West Central Minnesota
Joined: December 2, 2016



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.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 10:31:34
Eli Duttman
Audiophile

Posts: 9543
Location: Monroe Township, NJ
Joined: March 31, 2000
Contributor
  Since:
January 5, 2000
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.

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 3, 2017 at 10:59:41
Tom Bavis
Audiophile

Posts: 867
Location: Upstate NY
Joined: May 25, 2007
The original S-5000 is in Sams 475-9. You can get a copy from radiomuseum.org - non-members can download 3 pages per day, 10 per month.

 

Easy but not always successful, posted on March 3, 2017 at 11:22:58
ToddM
Audiophile

Posts: 1528
Location: Atlanta, USA
Joined: May 15, 2001
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!

 

RE: Refubishing old Sherwood S-5000, need schematics, posted on March 14, 2017 at 17:08:44
Thermionic27609
Audiophile

Posts: 364
Joined: March 29, 2009
Note that Sherwood loved to make running changes in their products, so when you go looking for a Sherwood schematic, you often have to make sure you're in the right serial number range. Even then, you may find small variations.

 

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