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

37-630T RF and IF grid 3
#3

boy, am i missing something. i don't even see an IF grid resistor [which grid, by the way??]. except the one on grid 2 which is labeled on the schematic as 51K ohms to ground. i do see that "the that the RF amp has grid bias and the IF amp has cathode bias developed by the 400 ohm resistor in the cathode circuit." but i read 700 ohms on the IF cathode resistor, not 400 [just a typo?]. and the schematic says 15 ohms from the grid cap to ground, not 51K. but regardless, i'd like to know why the IF grid 3 is coupled to the IF transformer, which isn't common at all on the relatively few radios i've looked at.


Messages In This Thread
37-630T RF and IF grid 3 - by fenbach - 07-21-2022, 04:01 PM
RE: 37-630T RF and IF grid 3 - by RodB - 07-21-2022, 05:08 PM
RE: 37-630T RF and IF grid 3 - by fenbach - 07-21-2022, 11:05 PM
RE: 37-630T RF and IF grid 3 - by Ron Ramirez - 07-21-2022, 11:27 PM
RE: 37-630T RF and IF grid 3 - by RodB - 07-22-2022, 02:50 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
New 37-116 Parts
Has your card (or what have you for payments) been charged? I emailed back and forth with someone this last fall about ...morzh — 02:30 PM
Philco 46-480 Electronic Restoration
Hope the IF transformer is intact! Good luck! - GaryGarySP — 12:52 PM
New 37-116 Parts
Thanks for the relocation and sorry for the error. Yes - have called and emailed 3-4x and no response. IIRC when you...Doppleganger — 12:34 PM
New 37-116 Parts
Doppelganger No it is not the place, but it's OK, we will move it, possibly to "Philco Home Radios" (we oft...morzh — 10:33 AM
Philco 46-480 Electronic Restoration
Hahaha, very true! In any event, the photo didn’t show any substantial rust on the top side of the chassis. It also clea...jrblasde — 10:29 AM
Philco 46-480 Electronic Restoration
Donors always look good. Until they are out of their kidneys...morzh — 10:26 AM
Model 84 late buzz( 1935 run)
Bruce No, I cannot see where the pins should be connected: your first pic is centered on one spot and the other is ce...morzh — 10:25 AM
Model 84 late buzz( 1935 run)
Good Morning Everyone. Yet another brain teaser at hand.  This one is a 1935 version of the 84 closest I can figure fr...Bruce — 10:06 AM
Gloritone 27 Radio
Thank you MrFixr55 I will do that. I'll post back when I have that done. Might be a few days though. Dandconant — 09:42 AM
Philco 46-480 Electronic Restoration
The donor chassis looks pretty good, based on the photo I saw.jrblasde — 08:43 AM

[-]
Who's Online
There are currently 3799 online users. [Complete List]
» 3 Member(s) | 3796 Guest(s)
AvatarAvatarAvatar

>