Tubes Asylum

How important is the shield cover on the Sherwood S-5000 front end

68.54.136.2

airtime

There is a case that encloses the five preamp tubes and controls that covers the front end.

The reason why I'm asking is because I am trying to make a case. And this front case is really causing a LOT of problems fitting and making one.

What would happen if I left the case off?

Or is it really necessary if I don't play loud music. Thinking of feedback. Or is it shielding EMF that seep into the sound?

charles

Follow Ups:

preliminary pictures of the case - airtime 15:21:11 10/27/14 (2)
I still need to tweak it and fit it better. But here is the case so far.
- RE: preliminary pictures of the case - airtime 15:21:52 10/27/14 (1)
  .
  - RE: preliminary pictures of the case - Sherwood Forest 11:18:02 10/31/14 (0)
    It's just a shield, really, and to keep fingers away from high voltages. Running an S-5000 without it is rarely a problem, but it may raise the hum floor a tad, especially if there are nearby sources of magnetic fields.
    
    You can't really use individual shields on this model of S-5000, the sockets aren't correct for them, and you'll have to ground them manually somehow.
    
    My biggest concern is that you'll take the thing off, put it somewhere, and your vintage amp will then be forever separated from one of its original pieces. Don't let that happen, it will effect the value.
    
    I run my S-5000s without the shields often. Normally it results in just a slight raising of the noise floor, but not much really.
RE: How important is the shield cover on the Sherwood S-5000 front end - FlaCharlie 09:04:29 10/27/14 (0)
I think it's for shielding. The first version of the S-5000 had the preamp tubes mounted on an angle and used individual tube shields on them. The later version just had a metal cover that enclosed all of them. Most likely it was cheaper to produce. It might be difficult to fit individual shields on yours without replacing the sockets. You might try to fabricate a cover that gives you more clearance. I'm not sure how much of a problem it would be to run it without shielding. Wouldn't hurt to try it. It might depend on your location.

. . . Charlie
RE: How important is the shield cover on the Sherwood S-5000 front end - Michael Samra 08:56:10 10/27/14 (0)
Charlie
You can probably just put individual tube shields on each individual tube and be ok.
"

Edits: 10/27/14

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