Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Model 640 restoration questions.
#3

Tad,

Yes, the Sprague caps sound like replacements.

The shroud that goes around the bulb would probably look like the reflector from a small flashlight. Actually, that's not a bad idea - perhaps you could come up with one (preferably metal, not plastic) to use as a replacement. You could probably leave it in its silver color, or paint it a flat black. The material is fairly thin, so if you need to, cut it to shape as needed.

As far as other components go, resistors can often drift out of tolerance. Check them and replace any that are 20% or more off. When they do drift, they go up in value. Stay close to the correct wattage as best you can. The higher value resistors are the ones that are the worst (500K and up). Also, generally speaking, the smaller mica caps rarely go bad, so leave them be.

After getting it working, I'd recommend doing an RF alignment on the set. It should really sound great after that.

Looks like you have youself a winner! Icon_biggrin

Bill

Sent from my Pentium II on the AT&T Dial Network


Messages In This Thread
Model 640 restoration questions. - by Guest - 03-23-2007, 02:43 PM
[No subject] - by Chuck Schwark - 03-23-2007, 03:52 PM
[No subject] - by Bill Hutchinson - 03-23-2007, 03:58 PM
[No subject] - by Guest - 04-02-2007, 02:09 PM
The band that doesn't work...... - by AI2V - 04-02-2007, 07:48 PM
[No subject] - by Bill Hutchinson - 04-04-2007, 03:41 PM
[No subject] - by Guest - 04-05-2007, 08:09 PM
[No subject] - by planigan - 04-14-2007, 01:32 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM

[-]
Who's Online
There are currently 1691 online users. [Complete List]
» 3 Member(s) | 1688 Guest(s)
AvatarAvatarAvatar

>