1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Linear Mode
Power supply resistors in Model 48-300
codefox1
Silent Key
*****
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
#4

04-13-2011, 12:49 PM
Agree with all, if the resistor is not discolored or shorted out, it probably is fine. I've done a number of the 46 and 48 portables, and they are great performers.

My suggestion would to bring this one up slowly on a variac and measure the voltage on the filament string. It will probably be too high with today's higher supply voltages and your recap job. And if the rectifier fails and you replace it with a a diode, definitely you must beware.

I have added a couple of hundred ohm 10 watt resistors to the string of the filament supply to tame this down with the original rectifier in place and have had good luck with it. You would want to dress this close to the chassis as it would get warm.
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
Power supply resistors in Model 48-300 - by rck46 - 04-12-2011, 07:34 PM
Re: Power supply resistors in Model 48-300 - by codefox1 - 04-13-2011, 12:49 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
The speaker table error?
G  10-1/2"       65, 76, 87, 95 Push-Pull 45's 2766 0.7 550 3200 H   10-1/2"    77, 96 Push-Pull...morzh — 09:26 PM
A Marconi model 86
I have a Stromberg, one of the early ones, seems early 30s. This is what I call a back breaker. None of the early Philc...morzh — 08:28 PM
A Marconi model 86
A backbreaker.....PaulPaul Philco322 — 08:12 PM
A Marconi model 86
>>What a behemoth! A Juggernaut.morzh — 07:47 PM
Philco 70 antenna lead
I am not sure I understood about the coils and the mush. I looked an more than one coil in 20, 70, 90, 60, Zeniths and ...morzh — 07:46 PM
A Marconi model 86
:e_biggrin: What a behemoth!  I hope the final result is as much a quality sounding example!  Keep us posted on your pro...GarySP — 07:32 PM
A Marconi model 86
I should add that the double conversion may only be used on the shortwave bands, but I haven't looked at the schematic t...Arran — 07:27 PM
Philco 70 antenna lead
Yes, that wire will not pick up much interference as routed - the RF at that level won't be affected, and if you have st...radio1 — 07:26 PM
Philco model 60
I'm also a member of MARC. Did you attend the Vintage Electronics Expo in Waterford, MI last month? That's where I got...GarySP — 07:22 PM
A Marconi model 86
Dan Double conversion is using two IF converters instead of one. This improves the image response. morzh — 07:15 PM

[-]
Who's Online
There are currently no members online.

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration