Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

71b, please help with checking coils
#7

Thanks guys for your help and many thanks for the information for testing the voltages, my first time.

Good news, Not only did the the R.F., Det. Osc., and I.F. have voltage, I was able to pick up stations off the dial from 700kHz to 1400kHz, including my SSTRAN at 980kHz (with good fidelity on the SSTRAN and a clear station at 1400kHz).

The Voltages for all three coils, These voltages that tested on the Plate were plus or minus a bit.

R.F--------- Plate Volts P to K 245 (Tested 303 volts) Screen Grid SG to K 90 (Tested 100)
Det. Osc.--- Plate Volts P to K 235 (Tested 277 volts) Screen Grid SG to K 90 (Tested 83)
I.F----------Plate Volts P to K 255 (Tested 277 volts) Screen Grid SG to K 90 (Tested 95)

Now I did not test the Plate voltages for the Det. Rect., Audio, Output, and rectifier. But since I received audio loud and clear and power from the Rectifier, I would figure these are all good.

I would think the coils on this radio are good from my findings, I'm only a amateur at this so please give me your thoughts.

Thanks

Jon


Messages In This Thread
RE: 71b, please help with checking coils - by Philco281989 - 05-04-2013, 07:49 PM



Users browsing this thread:
[-]
Recent Posts
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM
Philco model 38 code 121 not receiving signal.
Good news everyone! I think I have found everything I need for rewinding the antenna coil primary. I found some pla...Stormlord5500 — 09:40 AM
Philco Battery-WWII vintage
My younger sister went to SUNY Plattsburg NY, (BS, MS, RN) in the late 1970sabout 10 min from the Northern NY / Canada b...MrFixr55 — 07:59 AM
Philco Battery-WWII vintage
Hello Bob, What Amazing find! Sincerely Richardradiorich — 10:19 PM
Testing a speaker and output transformer Trutone A2-G
Hi Murf, Do this: Monitor between ground and one plate of the rectifier while playing the radio.  Do the same with ...MrFixr55 — 09:51 PM
Philco Battery-WWII vintage
Mike; I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM
Philco 42-345 Restoration/Repair
The more the better. (Within reasonable limits.) 2-5 times more is no problem in this case.Vlad95 — 03:50 PM
Philco 42-345 Restoration/Repair
Thanks, RodB and Vlad95, I was mainly trying to figure out this capacitor to locate a replacement, Vlad thank you for...osanders0311 — 03:44 PM

[-]
Who's Online
There are currently 1231 online users. [Complete List]
» 2 Member(s) | 1229 Guest(s)
AvatarAvatar

>