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Majestic (Grigsby Grunow) 50/52
#32

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
"Let us begin to do good"- St. Francis

Best Regards, 

MrFixr55


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



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