[MRCA] FW: R-45/ARR-7 Power Supply?

[Michael Hanz]

I wouldn't use 270vdc, Eugene.  Halli specified the same voltage as the 
SX-28() that the ARR-7 was derived from because it was all the data from 
that they submitted to the guv'ment for contract approval.  But guess 
what?  There is no push-pull high fidelity amplifier, which is the only 
reason the SX-28() required that voltage.  Check out the max voltages 
for the tubes in the ARR-7, and you won't see such a high voltage 
recommended by the tube manufacturers. It runs much cooler and with more 
stability using around 200-210vdc plate supply for the set.  Same goes 
for the AN/ARR-5 VHF set.  Try it, you'll like it.

73,
Mike  KC4TOS

On 5/27/2023 6:13 PM, W2HX wrote:
>
> OOPS, That should be 270 VDC @ 135 mA not 2,700 VDC. Yikes
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos 
> <https://www.youtube.com/@w2hx/videos>
>
> *From:*milsurplus-bounces at mailman.qth.net 
> <milsurplus-bounces at mailman.qth.net> *On Behalf Of *W2HX
> *Sent:* Saturday, May 27, 2023 5:56 PM
> *To:* milsurplus at mailman.qth.net; mrca at mailman.qth.net
> *Subject:* [Milsurplus] R-45/ARR-7 Power Supply?
>
> Hello friends.
>
> I just acquired a nice ARR-7 that was electrically restored and 
> aligned by a very competent fellow (pic attached). He made a 60 Hz 
> AC-DC power supply for it, but it was crazy expensive. So here goes. 
> The specs I need are:
>
> 2,700 VDC @ 135 mA
>
> 25 VDC @ 350 mA (for scanning motor, which is half the fun!)
>
> 6.3 VDC @ 4.0 A
>
> Does anyone know if there is some existing power supply from some 
> other piece of equipment that might have similar specs that I could 
> begin hunting for? I know there is the PP-32/AR but my understanding 
> is that this is a 400 Hz unit (380 Hz to 1,000 Hz).
>
> If there isn’t another commonly available PS that would supply these, 
> I may have to resort to building one. On ebay there are transformers 
> with multiple secondaries but searching for such a beast is very 
> difficult. Any advice on searching for a multiple secondary 
> transformer? And of course, should all else fail, I could make a PS 
> with 3 transformers if necessary.
>
> Any suggestions welcome.
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos 
> <https://www.youtube.com/@w2hx/videos>
>
>
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-- 
Michael Hanz - KC4TOS
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