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

Majestic (Grigsby Grunow) 50/52
#16

Progress moving along! I have recapped this beast except for 4 electrolytics that are entombed in tar inside a huge armored box that I have circled in the attached photos. Also found what appears to be a mistake at the factory. On the schematic, the plate circuits for the RF amp and 1st detector are tied together as can be seen in red are on the schematic. Upon doing continuity checking and tracing wires, I can’t find continuity between the plate circuits. I fired it up to take voltage readings and both plates should be at 180v per schematic. The RF amp reads correct but the 1st detector is around 255v, clearly too high and proving both circuits aren’t being sourced from the same B+ as they should be. Drove me nuts tracking it down and I’ve come to the conclusion that it was wired wrong at the factory. It all looks original, not altered so I rewired the 1st detector so that it ties in with the same 180v source as the RF amp and it works. Need to gut that big box for the electrolytics yet and do an alignment. I will see how that goes!

Ron    


Attached Files Image(s)
   

Bendix 0626.      RCA T64  Philco 20B
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        Crosley 52TQ
Philco 37-116.    Philco 70
AK 35                Philco 46-350
Philco 620B.       Zenith Transoceanic B-600
Philco 60B.         Majestic 50
Philco 52-944.    AK 84 


Messages In This Thread
Majestic (Grigsby Grunow) 50/52 - by 462ron - 10-14-2022, 09:21 AM
462ron - by 462ron - 10-15-2022, 09:15 AM
462ron - by 462ron - 10-17-2022, 07:48 AM
462ron - by 462ron - 10-19-2022, 09:07 AM
462ron - by 462ron - 10-23-2022, 10:02 AM
462ron - by 462ron - 11-18-2022, 09:55 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 11-19-2022, 09:31 PM
462ron - by 462ron - 11-20-2022, 09:35 AM
462ron - by 462ron - 12-12-2022, 09:42 AM
RE: Majestic (Grigsby Grunow) 50/52 - by RodB - 12-12-2022, 10:29 AM
462ron - by 462ron - 12-28-2022, 04:11 PM
RE: Majestic (Grigsby Grunow) 50/52 - by Arran - 01-02-2023, 02:52 AM
462ron - by 462ron - 01-02-2023, 09:13 AM
RE: Majestic (Grigsby Grunow) 50/52 - by RodB - 01-02-2023, 10:50 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-02-2023, 11:25 PM
462ron - by 462ron - 01-03-2023, 09:52 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-04-2023, 10:41 PM
462ron - by 462ron - 01-05-2023, 09:53 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-05-2023, 06:01 PM
RE: Majestic (Grigsby Grunow) 50/52 - by Arran - 01-05-2023, 07:48 PM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-06-2023, 10:46 AM
462ron - by 462ron - 01-06-2023, 11:14 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-06-2023, 12:30 PM
462ron - by 462ron - 01-06-2023, 04:50 PM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-09-2023, 07:20 PM
462ron - by 462ron - 01-10-2023, 09:02 AM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 01-10-2023, 09:14 AM
462ron - by 462ron - 01-10-2023, 09:27 AM
462ron - by 462ron - 05-29-2023, 12:17 PM
RE: Majestic (Grigsby Grunow) 50/52 - by morzh - 05-29-2023, 01:29 PM
RE: Majestic (Grigsby Grunow) 50/52 - by MrFixr55 - 05-30-2023, 09:03 AM
462ron - by 462ron - 05-30-2023, 10:10 AM
462ron - by 462ron - 06-29-2023, 09:06 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM
5U4 vs 5Z4 tubes
5U4 and 5Z4 almost identical. I think nothing happened if you left 5U4 instedad 5Z4 long time. Just heater current 5U4 ...Vlad95 — 11:02 PM
Philco 42-345 Restoration/Repair
Hello Vlad95 , Very Funny ! Sincerely Richardradiorich — 11:01 PM
Philco 42-345 Restoration/Repair
RodB You are European yourself   :evil: I'm Canadian for the last 30 years  :snowman: But not Yankee  :lol: Vlad95 — 10:49 PM
Philco 42-345 Restoration/Repair
The band switch selects different oscillator coils for the band selected. I would look for a bad connection in the switc...RodB — 10:31 PM
Philco 42-345 Restoration/Repair
Hang in there...PaulPaul Philco322 — 09:30 PM

[-]
Who's Online
There are currently 914 online users. [Complete List]
» 2 Member(s) | 912 Guest(s)
AvatarAvatar

>