[MRCA] bC-474 Power Supply

[Tim]

Versatile!  Would that be for Ducks or for big game?  Asking for a friend...
About this item

   - Suitable for capacitor charging, hunting, withstand voltage test
   power, glow tube power supply, adjustable voltage output.

Tim
N6CC

On Thu, Jun 26, 2025 at 9:13 AM <scottjohnson1 at cox.net> wrote:

> All-
>
> This is my go-to for the last several years when I need a B+ supply for a
> RX or small TX. Powering my BC-474 with it.  Makes a great capacitor
> charger for a spot welder.  I also built a PP 6BQ5 car audio amp, and
> powered it with a pair of these:
>
>
>
>
> https://www.amazon.com/Aobao-Converter-45V-390V-Capacitor-Adjustable/dp/B09KRL9132/ref=sr_1_9?crid=3COY7ZW60LRT9&dib=eyJ2IjoiMSJ9.2RzlFZ02G0PaRSmRgHt7B_zoVkkok9_gEnEImwlLtqI8GTtaaejE71ttthwWNnkreW65u4u1kitiPlJM3wqegSkClBaiX3PRRLLkrozZeISSgouoeAw_EZki-zKyl9fvXeHyzNLVbim-jI3vlK4tpOLEj8Ml-WBjssGorEokJQ3BTkFD2kLjqo2yN2j4kWurO_HJDGOpjvyQ6AFD1j6FJJafnqYQQVf-tNTuX_9fMBs.NYGFkN4Snkg--fZovzL4nOM5sNJnvVUI0nTpjumw4fM&dib_tag=se&keywords=90-390V+DC-DC+converter&qid=1750953625&sprefix=90-390v+dc-dc+converter%2Caps%2C154&sr=8-9
>
>
>
> Shop it around, can be had for less than $10 in quantities.
>
>
>
> regards,
>
> Scott W7SVJ
>
>
>
> *From:* mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> *On
> Behalf Of *w1nzr--- via MRCA
> *Sent:* Wednesday, June 25, 2025 3:12 PM
> *To:* B. Smith <smithab11 at comcast.net>; Tim <timsamm at gmail.com>
> *Cc:* Military Radio Collectors Association <mrca at mailman.qth.net>
> *Subject:* Re: [MRCA] bC-474 Power Supply
>
>
>
> Seconding Tim's thank you  Breck....yeoman service as we cling to the
> trailing edge of technology, work on things no one really cares about and
> take the unimportant seriously...
>
>
>
> Cheers,
>
>
>
> Brown  / W1NZR
>
>
>
> On Wednesday, June 25, 2025 at 04:44:54 PM EDT, Tim <timsamm at gmail.com>
> wrote:
>
>
>
>
>
> Thanks for all the work you did to document all this Breck.  I don't have
> a '474 but your ideas have pretty universal application.
>
> Cheers!
>
> Tim
>
> N6CC
>
>
>
> On Wed, Jun 25, 2025 at 12:56 PM B. Smith via MRCA <mrca at mailman.qth.net>
> wrote:
>
> I've revised power supply information on the BC-474.
> Revised sections  include info on : Connectors, The FL-10 filter, Use of a
> GN-45, Dynamotors, Inverters, Battery Bias.
> The section on Dynamotors features notes and design info by Al N3FRQ and a
> Dynamotor list compiled by Robert WA5CAB is also included.  Another
> solution to the Receiver Bias problem using a small battery is also
> presented.
> K4CHE
>
> http://k4che.com/BC474power/BC474Power.htm
>
>
>
>
>
>
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