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

Philco 15X troubles
#1

Hi All - just getting back into restoring radios after a few years away and it feels GREAT.  Last fall I picked up a Philco 15X radio in great shape but of course not working - the fun part.
I have recapped the set and am able to fire it up to silence. 
Checking the voltages per the online schematics I found the P to K voltages on the Push Pull 42's to be about 10VDC and should be 255VDC.
Checking the Output Transformer I am seeing something I have not seen before.  The primary side has 2 leads attached to the plates of the 42's plus a center tap.  I have 295VDC at center tap and nothing out of the top and bottom leads.
Weird thing is I get 7K ohms measuring between top to bottom leads BUT 0.7K ohms CT to each of these.
Is this transformer pooched?  Am I missing something?  Suggestions for replacement?
All other voltages on the set are close - just the P - K on the 42's are way out.
#2

Oops - forgot to attach... http://www.nostalgiaair.org/Resources/138/M0013138.htm
#3

http://www.nostalgiaair.org/Resources/138/M0013138.htm
#4

Sounds like your opt is shot. I would think that you would see abt 2-3k or lower end to end and half that at the tap. These days there's a limited number of choices, Hammond 125D or E is one that comes to mind. Not good to have screen voltage on the 42's and no plate voltage it causes the sg to draw excessive current which can damage them.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#5

Thinking the same but have been away too long to be sure.  Not sure if what I see makes sense.  Thanks  Brian
#6

Terry - the 125D works GREAT.  Installed and BOOM the radio is loud and clear.  Alignment was pretty much on spec.  Need to glue on new grill cloth and re-assemble.
Thank you
Brian
#7

Glad to hear you got it running!

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry




Users browsing this thread:
[-]
Recent Posts
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM
Philco 42-345 Restoration/Repair
Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM

[-]
Who's Online
There are currently 2404 online users. [Complete List]
» 1 Member(s) | 2403 Guest(s)
Avatar

>