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

Model 048 set tester restoration help
#1

Well finally got the batter packs for this unit and need some pointers on some of the components. First their is a metal box just above the meter this is a 1 mfd capacitor. I tested it and it is still good. Should it be replaced ? I assume its like radio restoration and I should.It does not give the voltage rating on the parts list .What would be a good voltage rating for the cap?
Also a black bakealite box with three wires emitting from it one terminal to ground terminal post .Middle terminal to a rf choke I believe. and last to one of the pin of the 30 tube. Part number on component is 6287-F .The unit is in very good shape and would like to give it life again....
Thank you.
#2

The cap shpould be replaced. The original was probably a 400 volt part, can't cross ref the part number here at work in the service bulletin for the 048. Use a 630 volt film replacement. Put the new cap into the old shell, a la the Bakelite Block re-stuff method.

Chuck
#3

Thanks very much.Its all progress one step at a time. The only item I see on the parts list that might be the unknown part number is a terminal block.This component seems like it has more of a purpose.I was abel to get the ohm meter working and zero'd.
#4

Well took a few minits and researched your web site and found the page with the bypass condensors and does not give the number 6287-F but the image is identical .I will tets the condensor and see.
#5

The 6287-F bakelite block condenser is a DUAL 0.15uf unit, used for bypassing the RF generator section.
Common terminal for the two caps (ground in the schematic) is closest to mounting screw hole.
Center and end terminals are the other ends of the two caps. Re-stuff with new 200-400 volt film types.

No need to touch the mica 1800pF. cap, unless it's leaky (rarely). ALL resistors in there are suspect due to age drift. Check all of them. If any ore outside the +/-20% tolerance, replace for proper calibration.

Parts list calls out odd resistances for the voltmeter ranges, so if you need to replace any, use the closeset 2% value.
#6

Thanks Chuck.I will check the resistance tolerances today. I also read on your site that some of these bakelite condensors also had resistors built into them.The other cap that is in the metal box is rated as a 1UF is the tolerance for this +/- 20 % . I haven't got a 1 uf on hand.I also noted in the parts list that the set came with some leads and some sort of universal adapters. In your vast library of Philco service data, would you have any info on these items.Or know of anyone who would have such items for sale ....
#7

Just parallel two .47/400 caps for the 1uF. Tolerance not cirtical.
The test leads were just that, leads with clips, probes, term adaptors.
Any good test lead set can be used. Just re-do the meter ends to mate with the pin jacks used.

Chuck




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
trying to identify this wire type
Thanks to all for the feedback. As Arran said, it is probably an older replacement and yes it has a grid cap so I will ...georgetownjohn — 09:32 PM
trying to identify this wire type
It's possible that the red wire, actually a grid cap lead, is a very old replacement, I can't remember seeing a pre 1939...Arran — 09:18 PM
Gilfillan Brothers Car Radio?
Hi everyone,  Special thanks to Joe Rossi for tracking down this obscure radio and thanks to others who took up the hun...Antipodal — 08:15 PM
trying to identify this wire type
Here's one source for your wire of many. Take care and BE HEALTHY! Gary P.S. Can't get the right color you need? I ...GarySP — 06:40 PM
trying to identify this wire type
...and modern wire of the appropriate gauges and insulation V-rating (300V minimum, usually shown right on the wire) is ...morzh — 05:47 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
I have a question about this radio, is there anyone that has access to this radio that has an intact unmolested speaker ...captainclock1988 — 04:28 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
Well what makes me confuse all of those companies is that all three of those companies (Setchell-Carlson, Stromberg-Carl...captainclock1988 — 04:21 PM
trying to identify this wire type
The red wire is rubber covered wire. The others are cotton braid over rubber often in colors or a tracer, also strand...Chas — 02:43 PM
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached.  I am not sure ...georgetownjohn — 01:53 PM
Philco 60 Squealing
All correct shields must be in place, all tubes correct no subs of any kind. Check any soldered, riveted ground conne...Chas — 01:24 PM

[-]
Who's Online
There are currently 2534 online users. [Complete List]
» 1 Member(s) | 2533 Guest(s)
Avatar

>