Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Hybrids or Frankenradios
#6

Ron-
Room for three (actually 4) tubes wasn't that difficult on the 37-620 chassis.

Since the original xfmr had smoked I used a Greenlee to punch a new hole for a 5Y3 rectifier next to the 6F6; with the two filter caps now underneath, that left room for two octal gas regulator tubes, 0D3; on the RF deck I removed the large electrolytic and installed another octal socket in it's place- that became a second IF amp (another 6K7). All this makes for a VERY sensitive and stable radio especially with a balanced antenna input (coax-to-toroid).

The escutcheon was replaced with a larger console type with the shadow meter window; behind that is a large bright LED. I will pull the chassis in the next couple of days to see how I connected the LED but it was somewhere in the AGC circuit (not the AGC line).

Pete AI2V


Messages In This Thread
Hybrids or Frankenradios - by Ron Ramirez - 07-22-2007, 09:43 AM
Frankenradios - by AI2V - 07-22-2007, 08:51 PM
[No subject] - by Ron Ramirez - 07-22-2007, 11:16 PM
[No subject] - by Texasrocker - 07-22-2007, 11:18 PM
[No subject] - by rickd - 07-23-2007, 09:02 AM
Crowded 37-620 chassis- nah! - by AI2V - 07-23-2007, 02:44 PM
[No subject] - by Ron Ramirez - 07-23-2007, 07:34 PM
[No subject] - by Ron Ramirez - 07-23-2007, 07:40 PM
[No subject] - by Texasrocker - 07-31-2007, 10:45 PM
RE: Hybrids or Frankenradios - by Ron Ramirez - 03-22-2008, 10:04 AM
[No subject] - by Steve Davis - 03-22-2008, 01:40 PM
[No subject] - by Ron Ramirez - 03-23-2008, 12:36 AM
[No subject] - by Texasrocker - 03-23-2008, 01:27 AM
[No subject] - by Ron Ramirez - 03-24-2008, 10:07 PM
Re: Hybrids or Frankenradios - by Ron Ramirez - 12-09-2010, 09:49 PM
Re: Hybrids or Frankenradios - by TA Forbes - 12-10-2010, 12:03 PM
Re: Hybrids or Frankenradios - by DeckApe - 12-11-2010, 06:15 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Jackson 715 not working
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM
HiFi (Chifi) tube amp build - but my own design.
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM
Jackson 715 not working
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM
Restoring Philco 37-604C
Yep. F5 is green, D5 is Red. Red is Bad. Green is Clean.morzh — 01:30 PM
Jackson 715 not working
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM
Restoring Philco 37-604C
(Insert Homer Simpson "DOPF" Here.) When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM
Philco 91 Speaker Replacement
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil. It wo...morzh — 08:44 AM
Philco 91 Speaker Replacement
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM
Philco 91 Speaker Replacement
As Rod said, it is OK to use a fitting speaker, and then look for an original one. If you buy a Hammond 125 output tr...morzh — 08:15 AM
Philco 91 Speaker Replacement
Yes, I often have to substitute, then keep an eye out for an original. In the meantime, the radio is working and being e...RodB — 08:02 AM

[-]
Who's Online
There are currently 5366 online users. [Complete List]
» 1 Member(s) | 5365 Guest(s)
Avatar

>