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 8" speaker field coil rating
#1

Hi:

In the Philco 37 630 and 37 620 series, the standard 8" speaker used(with 3 soldering posts), the ohm rating for the field coil was never mentioned or noted in any of the Philco schematics or parts list. Coming across many of these type speakers I have noticed differences in field coil size and differences in ohm value.
I have mixed and matched these type 8" and even 12" speakers to different chassis 's of the 630 and 620 series and never had a problem. What is the reason for the various size field coils?? (Better sound output)?
Thanks.
#2

All are rated at 1140 ohms. The value is not given in Bulletin 250 (37-620) or Bulletin 251 (37-630), but is given in Bulletin 251A (revision for both 37-620 and 37-630).

The 8 inch K-38 speaker used in Model 37-630T has a larger field coil than that used in Model 37-620B (S-7), even though they have the same DC resistance. Heavier field - better bass response. Ditto the 10-1/2" speakers used in the console models (H-24 and HS, respectively) - note that the originals were 10-1/2" diameter, not 12".

--
Ron Ramirez
Ferdinand IN




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco model 38 code 121 not receiving signal.
Hello Stormlord, Well done on rewinding that coil it turned fairly good for your first one. Sincerely Richardradiorich — 09:12 PM
Philco model 38 code 121 not receiving signal.
Well here it is. It ain't pretty, but hopefully it'll work. I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
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

[-]
Who's Online
There are currently 863 online users. [Complete List]
» 2 Member(s) | 861 Guest(s)
AvatarAvatar

>