The ARN-6 needed the 400 cycle AC via the vibrator to make the "needles" work. Vibrator Failure resulted in a usable receiver but a frozen needle and the fun began- you could still turn the aircraft to take a aural null - but the secret was there was a spare vibrator attached inside of the receiver lid.
k4che

On 9/7/2025 11:10 PM, [email protected] wrote:

Add R 392 to that 28VDC B+ list. I found better performance with higher plate voltage but not enough to justify any permanent mods.

ARN 6 was so much easier to install than SCR 269

or ARN 7 which both required 400 cycle 110 VAC. ARN 6 needed high frequency AC for the

selsyns but it used a 28 VDC vibrator to accomplish this.

Mark

AF6IM

On Sun, Sep 7, 2025 at 2:09 PM Charlie L. <[email protected]> wrote:

I have run every ARC 5 receiver I have on only 28VDC B+. Have to use a set of headphones, but with a clean DC supply, feeding 28 to both filament and normal dynamotor B+ pin, they work fine. The ARN6 RDF uses all common tubes and runs only 28 on the plates. I have never analized the ARC 5 on 28V B+, checking sensitivity and selectivity, but just for normal comparisons, seemingly very little difference except for audio power out..

Charlie W4MEC in NC

______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html