[MRCA] R390A dropping resistor value

[Bill Mellema]

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?
 

 
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> wrote:          Great….thanks Jeep      Bill N3WM 
 
 
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On Friday, January 23, 2026, 7:30 PM, Jeep Platt <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         Sent from my Verizon, Samsung Galaxy smartphone 
 Get Outlook for Android     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: Thursday, January 22, 2026 8:23:33 PM 
 To: Military Radio Collectors Association <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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