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On Tue, Jan 10, 2023 at 03:36 PM, Richard Knoppow wrote:

Marine version has an AC/DC power supply to operate on ships which have only DC mains.? The S-77 is the marine version of the S-40

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hi Richard again ,and others
i don't understand your wording ...
I can see that the S-40 [no B] has an octal socket? not a supply? to allow it to be connected to some? DC from somewhere, rather than AC
I can also see the S-77A has an octal socket? for? asimilar purpose, and? voltages=? while the normal plug can work on AC or DC.
?if the octal socket scheme justifies "marine"? ok .. but .hold on...
my Osterman's calls the s-51 [sea arer] a "marine band" receiver and then list band 1 as .132 to .405 Mcees--- looks like "marine" to me.
The next listing is the S-52? also called "marine band" but bands are typical of most SW receivers, and don't look "marine" to me.

halli listing in catalog?? says
S-51 Marine Receiver
Rugged and specially constructed for dependable sea
or air use. Range 132 KC to 13 MC covers all impor-
tant channels. Fixed frequency operation possible on
three pre-tuned channels; facilitates switching fre-
quency and/or standing guard. Built-in PM speaker.
CONTROLS: Band Selector — 132-405 KC, 485-1530
KC, 1450-4550 KC, 4.2-13.0 MC, plus 3 fixed freq. posi-
tions in 200-300 KC and 2-3 MC range; RF gain,
Volu me, C W/A M, Range Filter, ANL, Tuning, 3 posi-
tion Tone, C W Pitch, Rec./Standby. Gray steel cab-
inet: 18 % by 9 by 9% in. deep; piano hinge top.
Doublet or single wire antenna. Phone jack. Socket for
6, 12, or 32 v. vibrapack. 105-125 v. 50-60 cycle AC or DC.
9 TUBES PLUS RECTIFIER: 6SS7 RF Amp., 7A8
Cony., two 6SS7's IF Amps., 7C6 Det., 35L6 or 6V6
Output, 7A6 Noise Li miter, 6SS7 BFO, 35Z5 Rectifier.
S-51. Ship. wt. 31 lbs Amateur Net $149.50
Vibrapack for 6, 12, or 32 v. operation $22.50


-52 Communications Receiver
Exactly like the S-40A except designed for AC or DC
operation. 7 Tubes plus rectifier and ballast tube; RF
and IF tubes like S-40A; then 6H6 Det., 6SC7 and AF
Amp., 25L6 Output, 25Z6GT Rect., and Ballast.
S-52. Ship. wt. 30 lbs Amateur Net $79.95

this listing says nothing about "marine" or having optional dc power packs.
from a quick look, the s-52 power source variations are not as flexible as the s-51.. but somewhere there must be some fine print.

so sometime is need to see what manuals indicate ..
so i remain for now unsure what to take from it all.
enufff
73? don VA3DRL