Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco signal generator - need help -revised
#1

I have an old Philco signal generator, but do not know the model number, and would appreciate a source for a schematic. Does anyone have any suggestions as to where to look? Here is a photo:

[Image: http://i269.photobucket.com/albums/jj77/...ure008.jpg]

Web site: http://www.masekconsulting.net
Radio Photos: http://www.photobucket.com - album id FStephenMasek
#2

I think Chuck may have the schematic to that one? Ask him... Icon_smile

--
Ron Ramirez
Ferdinand IN
#3

Jim on another forum sent me the schematic and two pages of instructions / adjustment information.

The unit is a Philco 077.

Now two questions:

1) The schematic below shows an interesting filtering arangement on the 120VAC input to the power supply. I will be using the signal generator to adjust some radios which have a three wire cord and the chassis connected to Earth ground, so that means the chassis of the signal generator will be connected to Earth ground. I would prefer to install a three wire cord and ground the chassis of the signal generator. What changes, if any, should be made to the filtering system?

2) The schematic shows part 22 as a 9,000 ohm resistor parallel to one of the B+ filter electrolytic capacitors (right of center in the schematic). However, the resistor in the set is an old 5,000 ohm unit (blue body, black end, red stripe) which has drifted up to 8,300 ohms. It looks original. Do you think this is a production change, production error, or change by a previous owner (somebody had been inside, as leaked wax from the power transformer had been scraped away from some spots, and the pilot light socket/wiring might have been changed)? Given the higher line voltage these days, would increasing that resistor to 10,000 ohms be a good idea?


[Image: http://i269.photobucket.com/albums/jj77/...ematic.jpg]

Web site: http://www.masekconsulting.net
Radio Photos: http://www.photobucket.com - album id FStephenMasek




Users browsing this thread:
[-]
Recent Posts
Jackson 715 not working
Mrfixr55, its working now. I cleaned the switches and sockets with spray cleaner. Thanks for helping on this one.daveone23 — 06:26 PM
Jackson 715 not working
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM
HiFi (Chifi) tube amp build - but my own design.
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM
Jackson 715 not working
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM
Restoring Philco 37-604C
Yep. F5 is green, D5 is Red. Red is Bad. Green is Clean.morzh — 01:30 PM
Jackson 715 not working
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM
Restoring Philco 37-604C
(Insert Homer Simpson "DOPF" Here.) When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM
Philco 91 Speaker Replacement
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil. It wo...morzh — 08:44 AM
Philco 91 Speaker Replacement
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM
Philco 91 Speaker Replacement
As Rod said, it is OK to use a fitting speaker, and then look for an original one. If you buy a Hammond 125 output tr...morzh — 08:15 AM

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

>