Why not do it right??? 24V dc supplies are readily available and not very expensive. A proper 250 volt supply is also readily available, or one can build it and not fool around with “conversion” voltage doublers, etc,
OR purchase one of kitparts solid state dynamotors, and the 24 V DC supply and don’t screw up the radio. I have several ARC 5 variants that were quite well butchered as well as other once fine radios that were “converted” to amateur use based on the goobers at CQ and 73 magazine not having the manuals or intellect to determine just what the radio was.
The BC375/191 series were known for TVI, all because the surplus dealers separated the tuning units from the transmitters and sold them separately. No one ever read the book --- the tuning units were matched to the transmitter, and properly neutralized as well as adjusted/tuned for proper operation. That is why those units in my youth were a source of parts.
As I have learned over the years, nearly every receiver built for shipboard or aircraft use only required proper power to work quite well in amateur service, particularly in the 60’s when the radios were quite plentiful and relatively cheap. Tuning an ARC 5 was a bit of a problem because of the spline drive, but, that was back then relatively easy as the local tuning knobs were readily available. Now they are almost in the “unobtanium” list.
Robert
W4RRD
From: [email protected] <[email protected]> On Behalf Of J Mcvey via ARC5
Sent: Saturday, April 29, 2023 1:13 PM
To: [email protected]; [email protected]; [email protected]
Cc: [email protected]
Subject: Re: [ARC5] R-508/ARC Conversion
You can probably use the same idea as was posted here a week ago about simply using a 12v transformer for the heaters and use a voltage multiplier stack to get to 150 volts or so.
I'm going to build the 24v version and try it on an arc5 receiver. I like the simplicity of it.
The radio will work ok with reduced voltage if the ground is removed from the screen grid voltage divider and allowed to float higher.
I suspect the voltage divider design may be similar on the R508.
BTW, I tried running an ARC 5 with the modified screen divider on 24 volts plate and it worked-poorly. The radio received , but there wasn't enough power to produce good audio output levels.
On Saturday, April 29, 2023 at 12:55:34 PM EDT, <[email protected]> wrote:
Not much to dop to convert it, give it power, put a tuning crank on it, and
a speaker, and you are good to go.
N6CC has sufficient info on his website to get you going:
n6cc.comm/type-12-am-aircraft-system/
Scott W7SVJ
-----Original Message-----
From: [email protected] <[email protected]> On Behalf
Of [email protected]
Sent: Saturday, April 29, 2023 09:09
To: [email protected]
Cc: [email protected]
Subject: [ARC5] R-508/ARC Conversion
Greetings All,
Has anyone converted an R-508/ARC using the article in the June
1965 issue of 73 Magazine ?. I would like to get this old girl running so I
can listen in on out local airport Automated weather transmissions.
Jeff N2LXM
Amateur Radio Operator
American
Patriot
Proud Father of Two US Marines
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