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

New Philco 20 Filter Caps...In, but Another Question??
#16

It could be that you are drawing additional curent, possibly through an un-replaced cap down the line.

Agree, finish the re-cap, then address the power resistor issue.
#17

That makes excellent sense. Thanks!!
#18

Current.....

Jeez, my teachers learned me good. Icon_eh
#19

TA.....no problem...I understood your post very clearly
#20

I'll mention in passing that it is important that the input filter cap (#26 pins 1-2) should not exceed the capacitance value of the original. If it does it can give you a much higher plate volt than is shown on the diagram and will cause the B/C resistor to get very hot!!!
Terry
#21

I'm almost done recapping, BUT, I need to know what the values and voltage ratings are of the filter caps (26), between pins 1 & 2, 2 & 6, 1 & 4, 1 & 3 . THANKS!!
#22

Schematic not the best, but I think you would be OK with 10 watts ---- if there is nothing else dragging the rest of the voltage divider down. You will know better once you recap and recarb the set. If you have an analog 250 or 500 ma DCmilliampemer you can see just how much current this resistor is drawing by putting it in seriees with the hot resistor l (+ side to B+. ) I wouldn't expect to see more than 30-50 at most ma load from there. If there's more, something is wrong down the line. But do completely recap first at very least.
#23

As for the capacitors in the multi-cap can...it would be best if you use yellow metalized film caps rated at 600 WVDC. You can use electrolytics rated at 450 WVDC for the 1 and 1.5 uF caps but they will not last as long.

--
Ron Ramirez
Ferdinand IN
#24

Thanks for all your help on this so far guys. I'm going to order the caps, and from reading other posts, I know how to open the can and wire the caps inside when I get them. Learned a lot so far. Thanks again!!
#25

Hello.......Found Metalized Polypropylene, 630V, aluminum metalized polypropylene film capacitors on Antique Electronic Supplies web site. They have 1.0 1.5 & .15 Will these do?...THANKS!!
#26

Yes, they will do it!
#27

Thanks TA...I'll order them now. P.S. Got the top of the can off, with the base still wired and intact. I can clean the can out while I wait for the caps. So far so good. THANKS AGAIN!!
#28

Hey Joe
I might have a spare B/C resistor if you need it. Awhile back I ended up with a few extra 20 chassis... Tnx Tom and others.
Terry
#29

Words of wisdom and lessons learned-take plenty of pictures before you disconnect those wires for recapping. I managed to stuff mine with standard orange drops at 630v but it was tight. 450v electrolytics would have given much more room but as Ron indicated, the longevity wouldn't be as good. This is what the wiring looked like inside the can on mine before snipping and removing some of the tar to have room to fit the caps.

[Image: http://i180.photobucket.com/albums/x220/...EF4684.jpg]

[Image: http://i180.photobucket.com/albums/x220/...F4682a.jpg]
#30

Hello All.....

Want to say up front...thanks for all the posts and help. Here is where I am now. New caps came. Took top of can off, clipped all old wires from the old caps and lifted the can out, leaving the bottom part of the can in; also leaving all the wiring in place under the can. (Did not have to touch that)! So now have 1mf across 1 & 2, 1mf across 1 & 4, 1.5mf actoss 1 & 3, 0.15uf across 2 & 6. (Again, old caps completely out of the circuit). The caps are rated at 630v. P late voltages all within speck. The 10 watt power resistor across b/c pins 1&2 still gets hot to the touch. There is 55vdc across it, and putting an amp meter in series, it is drawing about 33ma. This is the olny component hot to the touch. I have had the radio on now for 5 hours, running like a champ! Aligned it at 1400 on the dial, and the dial tracks. Should I put in a 20 watt 1500 ohm resister, or just snug the 10 watt against the chassis as a heat sink? The resistor has not gotten any hotter. Thanks again everyone. Joe




Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Philco 38-7 Speaker
4-ohm speaker. Black, Green leads.tludka — 07:00 PM
Philco 42-390, code 121 speaker
#87 on the schematic.  This radio had a 8" Zenith  speaker attached to it when I got it. I do don't know the hist...Stevelog — 06:39 PM
Philco 60 Squealing
I'm pretty sure I now have the litz wire soldered. This did not make any difference. Back in April I rewound the seconda...dconant — 06:25 PM
Philco 38-7 Speaker
Just to make sure, you chose either 4 ohm into 5K or into 10K? (blk-org or blk-grn)morzh — 06:23 PM
Philco 38-7 Speaker
I have let this one sit because of other duties. Now I am back, and I have a couple of questions. I hooked up a Hammond ...tludka — 05:34 PM
Philco 42-390, code 121 speaker
>>A closer examination of the very small print schematic indicates that the speaker is a PM type. This shows a ...morzh — 05:18 PM
Philco 60 Squealing
Litz is typically tinned by simply rubbing it with the soldering iron tip while immersed in solder (and a bit of rosin f...morzh — 05:14 PM
Philco 6K7
The suppressor grid (if by G3 you mean the S) is usually at the Cathode potential, which in this caes is GND. I am not ...morzh — 05:10 PM
Philco 16B Parts
Thanks for the reply. Unfortunately the radio was removed before bidding was over so I didn't get a chance to bid.dconant — 04:10 PM
Philco 16B Parts
Hi Dan, Mike is correct, there's a lot of painted stuff on the chassis but it looks pretty good. The sm is all there,sp...Radioroslyn — 03:50 PM

[-]
Who's Online
There are currently 3830 online users. [Complete List]
» 1 Member(s) | 3829 Guest(s)
Avatar

>