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

New Philco project on the bench
#4

I've just about finished overhauling this set, it has been taking longer then I thought, but that's pretty normal when going back over someone else's work. The set seems to be from around 1949-50 according to the RCC manuals, but it looks like a Canada only wooden model using a similar chassis to the US Transitones, perhaps a model 520? I found a few bad resistors, the worst being a 69,000 ohm resistor supplying the screen grids of the converter and IF amplifier tubes, it was reading 530,000 ohms. I think that this may explain the low volume situation. I replaced the choke resistors in the power supply, one was a one watt 220 ohm resistor, the other a half watt 1200 ohm unit, replaced each with larger wattage resistors. I also replaced the plate resistor for the 14B6 while I was at it since it was next in line, it was reading 540,000 rather then 470,000 ohms, it won't make much difference in performance but it likely would have gone open at some point anyhow. So two more paper condensers to change, then the filter condensers, and we are onto alignment.
Happy New Year
Arran


Messages In This Thread
New Philco project on the bench - by Arran - 01-06-2009, 01:13 AM
Re: New Philco project on the bench - by Arran - 01-07-2009, 02:03 AM
Re: New Philco project on the bench - by Arran - 01-16-2009, 12:39 AM
Re: New Philco project on the bench - by Arran - 02-17-2009, 12:12 AM
Re: New Philco project on the bench - by Jim Berg - 02-18-2009, 02:33 PM
Re: New Philco project on the bench - by Guest - 08-04-2010, 09:18 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
B&K 1077B no video
Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM
B&K 1077B no video
Hello Tim, Here is a link to restoration of one on Phil's old radios site ! Sincerely Richard bk1077bradiorich — 09:01 PM
6TPZ and 5TPO Radio Help
I'm a little befuddled on this one. Should X5 and X4 be tied together like this?  It looks like someone added this at so...R3Sons — 07:33 PM

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

>