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

37-665 vs 37-660 Why ?
#1

I recently saw an ad for a 37-665, and began to research the radio. In looking through the wonderful resources on this site I found it is an amazingly nice design. I also am left a bit puzzled. The 37-660 seems to have a better band coverage for general shortwave listening, being continuous coverage from 2.3 MC to 18.2 MC, while the 37-665 goes much higher, up to 42 MC, but leaves a gap from 22 to 25 MC. What was the purpose of the gap from 22 to to 25 MC ? Were both this and the one from 1720 KC to 2.3 MC removed because they were "police bands" ? Also, and perhaps more important, what was the purpose of going so high in frequency with a home receiver? If any of our Philco gurus know, please let me know. I find it interesting. I would like to know the market they were trying to cater to.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Testing a speaker and output transformer Trutone A2-G
Would an output transformer if weak, cause the problems I am seeing with lower B+ voltage? murfmurf — 01:22 PM

[-]
Who's Online
There are currently 753 online users. [Complete List]
» 2 Member(s) | 751 Guest(s)
AvatarAvatar

>