Majestic (Grigsby Grunow) 50/52
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
Thanks MrFixr for your input but probably not going to alter this set. The next radio I come across with a power detector or grid leak I may give it a try. I don’t have any TRFs at this time except for an Atwater Kent 35 but I would need to find/build a battery eliminator and a horn speaker first so it’s on the back burner for now. My dad did tv/radio repair in the 50s and early 60s and took a NRI home study course in electronics way back when. As a teenager I started reading it and that got me hooked. I loaned it to coworker foolishly back in the 70s and never got it back! I remember reading Ron’s post on bypassing an open interstage transformer but I’ve never had to try it yet. Good stuff. When the time comes, I will have some research to do!
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
Posts: 1,007
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
I hear you Ron, re not modifying the majestic other than building an adaptor that you can sub for the tube.
Re the AK 35, you don't need a horn, you can use a PM Dynamic and an output xformer from an AA5 radio. Primary impedance of about 2.5K Ohm is about right for a 01A, 112 or 71A.
You can run the AK35 or most other battery TRFs off an old computer power supply for the filaments (from the main +5 Volt Power Supply), and a bank of 9V transistor batteries for the various B+ voltages. 3 AAA cells will work fine for the bias for the 1st AF and Output tubes if using 01A or 112A as an output tube. For more power, use a 112A, 135V for the Audio B+ and -9V bias for the output stage (The 1st AF and Output stages have separate bias connections on the 35) will yield 115mW. For even more power, use a 71A. At 90V B+ you need about -17V bias (yields about 125mW). At 135V B+ you need -27V bias (gets you 375mW). The tube will take 180V B+ but you need -40V bias but you get 700mW of power
Of course If you go through about 5 sets of 9V batteries, you coulda bought an ArbeIII (I finally did).
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
(This post was last modified: 01-09-2023, 06:35 PM by MrFixr55.)
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
MrFixr that’s something to think about. The AK35 was given to me long ago and I haven’t given much thought to getting it up and running so I put it away. It’s been so long since I’ve even seen it that I don’t remember if parts are missing. I’m pretty sure some of the tubes are. Anyway, that’s a lot of information you laid on me and food for thought!
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
Posts: 1,007
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Sorry, Ron, TMI is what I do. (Hey, this may be my shortest post.) My last responsibility for my job is to write service procedures for laboratory automation systems. I am driving my coworkers crazy but once I retire, the info would leave with me if I don't write these documents down.
I have 2 AK35s. the only thing missing on mine are the bands and pulleys that gang the individual tuning capacitors. Otherwise, these are very simple radios. Only thing that goes bad other than the linkage is the grid leak, the interstage transformers and the wirewound resistors between the tuning caps and grids of the RF Amp tubes.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
(This post was last modified: 01-10-2023, 08:21 AM by MrFixr55.)
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
LOL MrFixr, no such thing as TMI, it’s all good information to have. Now my curiosity is piqued as to the actual condition of my AK35!
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
Well now that Spring has arrived, finally got to go out on the deck to refinish my Majestic 50. Installed new grille cloth and finished the chassis some time ago. I’m not a fan of doing cabinets so cheated a little on this one. After stripping and cleaning the original finish, the cabinet retained its original color so I didn’t see any need to use colored toner on it. I just shot it with some sanding sealer then 3 coats of clear satin lacquer.
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
(This post was last modified: 05-29-2023, 11:18 AM by 462ron.)
Posts: 15,704
Threads: 551
Joined: Oct 2011
City: Jackson, NJ
Looks nice.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 5,074
Threads: 269
Joined: Nov 2012
City: Bandon
State, Province, Country: OR
very nice!
Posts: 1,007
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
Ron, a beautiful job on a beautiful, iconic radio!! Congrats!!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
Thanks guys, now onto tackling my 37-116 cabinet that I’ve put off way too long!
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
Posts: 3,138
Threads: 56
Joined: Apr 2011
City: Lexington, KY
It looks great
If you know anyone who lives in a mobile home you can loan it to them during tornado season to keep their home from blowing away
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
(This post was last modified: 06-28-2023, 06:54 PM by Eliot Ness.)
Posts: 809
Threads: 49
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
LOL, thanks John. When I first saw this radio at our local auction house, I liked the style of the cabinet so I bid on it and won. When I went to pick it up, I was shocked to see how insanely heavy it was for a table top radio, I think it’s over 60#. I wouldn’t have bid on it if I knew that up front. I am pleased with how it came out and it is a good performer but I won’t be moving it or rotating it much!
Ron
Bendix 0626. RCA 8BX5. RCA T64
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
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