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

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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: 3 Guest(s)
[-]
Recent Posts
1930s Stewart-Warner Tombstone Radio need help identifying model number
UPDATE: I was able to pick up a signal generator on the cheap (amazingly enough) on feebay and I did an IF alignment fol...captainclock1988 — 09:53 AM
Philco 91 Schematic
Hi Rod, The resistor connects to pin 4 and the ungrounded side of block 9. From pin 9 of the RF tube to one side of ...dconant — 09:34 AM
Just got a 49-1613 need to know...everything!
I just found your post. I have this exact same model, and have had it since 1985 when I was 15 years old! I performed a ...MuzzcoVW — 09:11 AM
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM

[-]
Who's Online
There are currently 10044 online users. [Complete List]
» 2 Member(s) | 10042 Guest(s)
AvatarAvatar

>