[Milsurplus] Fw: ER65

[Michael A. Bittner]

----- Original Message ----- 
From: Michael A. Bittner 
To: milsurplus at mailman.qth.net 
Sent: Friday, May 17, 2013 4:03 PM
Subject: ER65


I picked up this little Swedish ER65 regenerative receiver at a local swap meet.
https://www.dropbox.com/home/ER65
http://s1367.photobucket.com/user/kmmab/library/?sort=2&page=1

It is meant for mounting on a wall and continuous monitiring of the old 500 kHz emergency frequency.  It is well described in the RADIO MUSEUM web site.
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My question is: What is magic about 65 Volts DC for its power source?  Please note that 65 VDC powers the whole radio including the 12-volt heaters of the two tubes through the large dropping resistor shown in the chassis view, not just the B+ voltage. I doubt that a 67.5-volt B Battery could handle this current load, especially for any substantial length of time.
 
Was 65 Volts DC a standard power source on some ships or shore stations, or did it require an external power supply?
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Mike, W6MAB