[MRCA] R390A dropping resistor value

[Jeep Platt]

That is fine. The mod has it physicslly located within the audio module and connected just before the filter choke.

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From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> on behalf of Bill Mellema via MRCA <mrca at mailman.qth.net>
Sent: Monday, January 26, 2026 3:48:27 PM
To: JPHutch <jphutch60bj at gmail.com>; mrca at mailman.qth.net <mrca at mailman.qth.net>
Subject: Re: [MRCA] R390A dropping resistor value

Hutch & Jeep,

I installed the resistor in the rectifiers output line, pin 5 of P111!, the B+ line.

Bill N3WM


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On Monday, January 26, 2026, 3:38 PM, JPHutch <jphutch60bj at gmail.com> wrote:

Jeep -

Is this the correct location for the modification?

[Modification location ?]

Thanks

Hutch

On 1/24/2026 1:29 PM, Doran Platt via MRCA wrote:
OK...  the SPAWAR manual says 200-220 ohms, located in the audio module. It's inserted between the B+ input pin and the Pi section B+ filter. A Dale looks to be the type resistor. I think 10w is a bit high.
Jeep K3HVG
On 01/23/2026 9:11 PM EST Bill Mellema via MRCA <mrca at mailman.qth.net><mailto:mrca at mailman.qth.net> wrote:


Great….thanks Jeep

Bill N3WM


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On Friday, January 23, 2026, 7:30 PM, Jeep Platt <jeepcomms at outlook.com><mailto:jeepcomms at outlook.com> wrote:

Bill, I have the Navy book that shows solid-state rectifiers.  I will look it up in the morning...
Jeep K3HVG

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From: mrca-bounces at mailman.qth.net<mailto:mrca-bounces at mailman.qth.net> <mrca-bounces at mailman.qth.net><mailto:mrca-bounces at mailman.qth.net> on behalf of Bill Mellema via MRCA <mrca at mailman.qth.net><mailto:mrca at mailman.qth.net>
Sent: Thursday, January 22, 2026 8:23:33 PM
To: Military Radio Collectors Association <mrca at mailman.qth.net><mailto:mrca at mailman.qth.net>
Subject: [MRCA] R390A dropping resistor value

Guys,

I'm in the process of solid stating the power supply on a R390A. I need the value of the series resistor listed in the field change.

If anyone can help, I would appreciate it.

Best 73's

Bill N3WM

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