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 91-121 sensitivity
#16

If anyone has a 91-121 or 91/221 ( broadcast only) radio and you want to check, please see if your on/off switch has an extra "on" position (far right) that affects the sensitivity. The schematic and 44RF cathode tube socket data don't make sense as shown, thank you Terry, but 25 volts with the switch off and 5 volts with it on could account for this. The schematic and tube voltage data are here: http://www.nostalgiaair.org/Resources/884/M0013884.htm
Bob
#17

This sounds like either someone adapted the model 15 local-distance circuit to a 91, or else this is yet another of those undocumented factory mods.

Take a look at the model 15 schematic and see if the switching circuit is the same:

http://www.philcoradio.com/images/phorum/schem/15.jpg

--
Ron Ramirez
Ferdinand IN
#18

The 91 on my bench at the moment has only the ON-OFF function.
#19

Thank you Ron and Bob, that local/distance switch in the 15 schematic matches what I have. Checking the tube socket data for the 15 shows 30 volts on the 44RF cathode (only one listing). Going back to the 91-121, should all of them normally have 25 volts on the 44RF cathode unless they were a factory or "aftermarket" modification?
Bob
#20

Reading Bob's (klondike98) restoration progress on his 91 and Ron's comments about the on/local/distant switches reminded me of another set of questions. My 91-121 with the three position switch has the remnants of the gold Philco sticker on the chassis that models without the one piece tube shield had (the tube shield has the intact one). Also is there any significance in the stamped numbers on the chassis? I have C49313; there is no visible star like run number. Thank you.
Bob
#21

I don't believe the C49313 has any useful meaning.




Users browsing this thread:
[-]
Recent Posts
Model 70 Cabinet Trim
musar , Well if you have any more questions feel free to post away . Sincerely Richardradiorich — 08:56 PM
Model 70 Cabinet Trim
Although I have not made any cabinets or cabinet parts for a couple of years, I still have some parts left over, includi...Steve Davis — 06:26 PM
philcorepairbench.com - shadow-meter
Thanks Ron.fenbach — 02:43 PM
Model 70 Cabinet Trim
Thank you, Gary. Before making my original post, I had clicked on "Steve Davis Cabinets" only to find that it...musar — 02:25 PM
philco predicta
Welcome to the Phorum, cgl18! I am not your resource for television repair, but lots of friendly help is available here...GarySP — 02:12 PM
Model 70 Cabinet Trim
Welcome to the Phorum, musar! You can send Steve Davis a private message (PM). The site is at the top of the Home page...GarySP — 02:09 PM
Model 70 Cabinet Trim
How do I contact him? The only contact information for him I could find when searching online was a telephone number th...musar — 10:38 AM
philco predicta
Hello, good afternoon, I would like to ask what the possible problem could be if I don't have an image on the screen. I ...cgl18 — 10:19 AM
Philco model 38 code 121 not receiving signal.
So one last question before I finish this radio. Regarding the speaker and output transformer. I salvaged the original o...Stormlord5500 — 09:31 AM
462ron
It’s on the bottom of the homepage of our Philcoradio.com homepage! Ron462ron — 07:20 AM

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

>