On Feb 4, 9:39 am, wrote:
On 2 Feb 2007 21:57:03 -0800, "tack" wrote:

I have a few of these radios; I'm wanting to put together some battery
packs for them. Does anyone have a good schematic for a DC-DC
converter to take 9vdc to 90vdc?
I'm also going to need to make up a 4-prong connector for the battery
packs; any ideas anyone? Can the connectors be purchased? Thanks a
lot

Why not 10 9V batteries in series?

I came across a couple of old original battery packs (full of defunct
carbon-zincs) that took the innards out of so that i can fill it with
D cells for the "A" voltage and 9v batteries for the "B" power. You
can get the 9v battery connectors at Mouser for to cents apiece by the
hundred, and 5 cents for the pair if you buy just the connector snaps
and solder your own wires. But I thought that it would be good to
have a battery pack that would take just one type of battery at a
minimum number. 6 "D" cells sounds interesting, and should give a
reasonable life. I suppose I could use 10 9v battereis for the "B"
supply and two or three 9v in parallel for the "A" but that is still a
dozen or more batteries and the "A" supply won't last long. Also a
person could use 60 + 6 "AA" cells . . . .
I know at least one person sells a dc/dc converter for Transoceanics
that takes 9 DC cells (+ 1 for the dial light) but they want 90 bucks
for it plus what ever the shipping charge is.