1949 Motorola 5A9M

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1949 Motorola 5A9M

Arran
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Posts: 4,915
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA

#23

05-26-2025, 03:44 AM

Bob, Richard;
One more thing, I heard it suggested that it would not hurt to add a Zener diode between the start of the filament string, and ground. I have not tried this, but the filament string in most of these does add up to 7 volts, 8.4 volts in a set with an RF amplifier stage. How necessary it is I don't know, maybe useful in places where you have a lot of voltage spikes, or power surges, but it's not likely that someone would pull a tube and stick it back in whilst the set was still powered.
Regards
Arran

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Messages In This Thread

1949 Motorola 5A9M - by klondike98 - 05-10-2025, 01:36 AM

RE: 1949 Motorola 5A9M - by Joe Rossi - 05-16-2025, 07:56 PM

RE: 1949 Motorola 5A9M - by Arran - 05-19-2025, 12:41 AM

RE: 1949 Motorola 5A9M - by Arran - 05-20-2025, 07:48 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-22-2025, 11:49 AM

RE: 1949 Motorola 5A9M - by klondike98 - 05-22-2025, 12:22 PM

RE: 1949 Motorola 5A9M - by Arran - 05-22-2025, 02:28 PM

RE: 1949 Motorola 5A9M - by GarySP - 05-22-2025, 05:46 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-22-2025, 07:40 PM

RE: 1949 Motorola 5A9M - by Arran - 05-22-2025, 10:05 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-22-2025, 11:56 PM

RE: 1949 Motorola 5A9M - by GarySP - 05-23-2025, 12:18 PM

RE: 1949 Motorola 5A9M - by MrFixr55 - 05-23-2025, 10:15 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-24-2025, 02:25 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-24-2025, 11:47 PM

RE: 1949 Motorola 5A9M - by Arran - 05-25-2025, 01:02 AM

RE: 1949 Motorola 5A9M - by radiorich - 05-25-2025, 02:04 AM

RE: 1949 Motorola 5A9M - by klondike98 - 05-25-2025, 01:02 PM

RE: 1949 Motorola 5A9M - by klondike98 - 05-25-2025, 06:39 PM

RE: 1949 Motorola 5A9M - by RodB - 05-25-2025, 08:10 PM

RE: 1949 Motorola 5A9M - by radiorich - 05-26-2025, 12:43 AM

RE: 1949 Motorola 5A9M - by klondike98 - 05-26-2025, 12:48 AM

RE: 1949 Motorola 5A9M - by Arran - 05-26-2025, 03:44 AM

RE: 1949 Motorola 5A9M - by Arran - Yesterday, 02:07 AM

RE: 1949 Motorola 5A9M - by klondike98 - Yesterday, 10:45 AM

RE: 1949 Motorola 5A9M - by klondike98 - Yesterday, 11:34 AM

RE: 1949 Motorola 5A9M - by RodB - Yesterday, 01:54 PM

RE: 1949 Motorola 5A9M - by Vlad95 - Yesterday, 02:14 PM

RE: 1949 Motorola 5A9M - by klondike98 - Yesterday, 03:00 PM

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