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

37-650: BREAKTHROUGH!
#1

Finally- something positive to report! Based on my discoveries mentioned in my "Goofed" posting, I replaced the three incorrect capacitors, put it all back together, and, after a little tube swapping, and realignment work, I can now say I do have operations on both SW bands and the entire BC band!

(And literally minutes after I finished aligning the set, my frequency counter arrived, so I can make sure the RF generator is set up correctly...lol... Well, the frequency counter itself needs an overhaul... It must have sat a while: the usual radio issues, minus the mouse... I'll clean her up, and see what she does. )

So, the bands are all reasonably well aligned, I have definite reception, and I will put her back into her cabinet after a few hours run testing. I only had two brand new caps to put in(the third hasn't arrived yet) but I found I had an NOS Sangamo of the right value in stock, and it checked ok, so I put that in for now. I'll swap the other one in when it gives up, if ever.

I adjusted everything by the book, although step 3 for both SW bands was skipped: I have never mastered that one. Once I had BC working correctly, I tweaked the highest and lowest stations into proper position, and all the rest fell into place.

Thanks, everybody, for all the help!
Scott

Old Cars, Old Radios, Old Pipes and Young Women... What more is there?
#2

When you mentioned the incorrect caps in the RF section, I figured that was the problem, and I'm glad you caught it. I'll bet it's a real sense of relief, isn't it? Icon_biggrin

Scott, we're all very happy for you getting this one narrowed down and running again. It might have been a little painful along the way, but it's experience you can't buy that you'll use in future projects.

My 37-650 was my "mistake" radio as well, being my first transformer set/first wood set/first SW set/first console. Looking back, there's been several others I've worked on that would have been better suited for the purpose, but what is, is (so to speak). When it's all aligned and working properly, it can't be beat.

Nice going, Scott!

Bill

Sent from my Pentium II on the AT&T Dial Network




Users browsing this thread: 1 Guest(s)
[-]
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 2299 online users. [Complete List]
» 1 Member(s) | 2298 Guest(s)
Avatar

>