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silvertone 4587 band switch
9/14/2011 9:44:23 PMgreg
I have a 4587 silvertone console with a fried band switch. Does anyone have a chassis for parts or is there anyone out there that could possibly fabricate one?
9/17/2011 7:01:06 PMmelrose
Common problem on those. Switch often arcs shortly after turned on, when B+ is high due to quick rectifier warmup, other tubes take 20-30 seconds. The RF deck is the one which is problematic since there is B+ very close to lower potential on that section.

It can usually be fixed if you carefully grind out the carbon tracks with a Dremel tool, then fill with epoxy if you want to or need to for strength.

Then to keep it from happening again, you need to get the B+ off that wafer. The plate of RF tube can be fed through an RF choke back to B+, coupled with a cap to the switch, and the bottom end of the RF interstage coil primary lifted from B+ and connected through a .01 or so cap to ground.

Done many of them, no fun but can be done easier than finding a good switch. Probably many of these were junked in the past when the switch burned up and no replacements available when the sets were not all that old.

9/26/2011 11:50:10 PMgreg
:Common problem on those. Switch often arcs shortly after turned on, when B+ is high due to quick rectifier warmup, other tubes take 20-30 seconds. The RF deck is the one which is problematic since there is B+ very close to lower potential on that section.
:
:It can usually be fixed if you carefully grind out the carbon tracks with a Dremel tool, then fill with epoxy if you want to or need to for strength.
:
:Then to keep it from happening again, you need to get the B+ off that wafer. The plate of RF tube can be fed through an RF choke back to B+, coupled with a cap to the switch, and the bottom end of the RF interstage coil primary lifted from B+ and connected through a .01 or so cap to ground.
:
:Done many of them, no fun but can be done easier than finding a good switch. Probably many of these were junked in the past when the switch burned up and no replacements available when the sets were not all that old.
:Thanks for the info but half the wafer is gone. I'm stumped.

9/27/2011 2:46:32 AMWarren
Sometimes you need to be inventive in a case like this. Old computer data switch box for the use of switching printers. Some are fore position ( A-B-C-D ) others are only two ( A-B ) The wafers can be taken off the shaft, and use one or two of the wafers wired to your needs.
9/27/2011 12:00:25 PMgreg
:Sometimes you need to be inventive in a case like this. Old computer data switch box for the use of switching printers. Some are fore position ( A-B-C-D ) others are only two ( A-B ) The wafers can be taken off the shaft, and use one or two of the wafers wired to your needs.
:
Yes that is what i will end up doing.
9/29/2011 8:50:59 PMSteve S.
Not helpful for your band switch challenge, but here's a good reference for overall restoration on this model:

http://personalpages.tds.net/~pdieten/silvertone4587.html

Not sure who made this one, but Colonial was a big supplier to Sears during this period.



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