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

Model 41-250 dual 370 pf cap
#1

Well, I replaced the dual 370pf dual cap in the oscillator circuit with two individual 360pf caps and now the oscillator doesn't oscillate on the push button position of the band switch. On all other bands the cathode of the oscillator is grounded and the dual cap does not come into play. I measured to old cap and besides the 370pf between each of the sections and ground, there is a 170pf between the two 370pf cap sections. So, I added a cap between the the two individual replacement caps, and now I get a oscillator signal on the push button band. Has anyone else who has worked on this or similar models, and replaced the dual 370pf cap with separate units, had the same problem? Thanks.

Harv
#2

Never had that problem. Replaced lots of 'em. Sure you have the caps connected correctly?

Kind regards,
Terry
http://home.comcast.net/~suptjud/
"Life is simpler when you plow around the stump."
#3

They are in correctly, so I was surprised when it did not work. I thought that maybe Philco used the coupling between the two sections to provide coupling for the oscillator, since the cap is quite large for a 370pf unit.

Harv
#4

Your question Terry led me to take a third look at how I replaced the cap, and sure enough I had an incorrect connection. Works OK now. I guess my eyes are not as good as they used to be. Appreciate your comments.

Harv




Users browsing this thread: 1 Guest(s)
[-]
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 no members online.

>