[ARC5] BC-453-B Power Supply

Wed Apr 5 23:30:25 EDT 2023

Since the original question was power supply.  Here's a simple method I
have used, a 24 volt transformer for the original series filaments.  The
transformer also feeds a voltage quadrupler with common ground.  The 200
volt electrolytic capacitors were recycled from a couple of computer power
supplies.  If you want more than 134 volts, the circuit can be extended to
a fifth cap.

73 de Rich KB8TAD

[image: Half-wave quadrupler module with common ground.JPG]
[image: Voltage quadrupler power supply schematic.jpg]

On Wed, Apr 5, 2023 at 10:53 PM <hwhall at compuserve.com> wrote:

> Here's a look at another way to do a recap. The terminal board work was
> accomplished by Canadian Aviation Electronics (CAE) in 1955.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: Mark K3MSB <mark.k3msb at gmail.com>
> To: Robert P. Meadows <rpmeadow at bellsouth.net>
> Cc: Dennis Monticelli <dennis.monticelli at gmail.com>; hwhall at compuserve.com;
> arc5 at mailman.qth.net
> Sent: Wed, Apr 5, 2023 4:52 am
> Subject: Re: [ARC5] BC-453-B Power Supply
>
> " Do the “RECAP”  correctly"
>
> Using Tom Frobase's cap replacement kit is not the "correct" way to
> refurbish a receiver;  it is an alternate way.
>
> Tom's kits are very nice as I've looked at them before but on all the
> receivers I've recapped I've used just solder lugs or terminal strips.
> I've never had any problems.
>
> As Tom's video says, the only one that's going to know what's inside the
> radio is yourself, so what it looks like doesn't matter, and I agree with
> him.  In the decades I've been restoring radios, never once have I had
> someone come into my shack and ask to look under the chassis.   If you're a
> purist,  then you will certainly not want to use solder lugs, terminal
> strips, or Tom's kit as none of them are authentic -- you'll restuff the
> potted caps.   I never restuff the caps; I just save them in a bag with the
> radio's serial number on it so when I sell it (or croak...) and my radios
> go to the next person they'll have the option to repot.
>
> Interestingly, Tom seems to make a contradictory statement later in the
> video.  He indicates that when using terminal strips etc there's no
> structural way to put the capacitors in the radio and it looks like
> crap.
>
> If you're going to use your radio in an airplane going through air combat
> maneuvering then I'd worry about a good structural way to mount the
> replacement capacitors.  Otherwise, solder lugs and terminal strips will be
> more than adequate.
>
> I disagree with converting the filaments to 12V - that's just my opinion;
> YMMMV.   Just buy or build a 28V supply and build a B+ supply.  I used a HB
> HV supply for years then went over to an HP-23 that I picked up at
> hamfest;  the LV output on the HP-23 with a dropping resistor works great.
>
> Don't get me wrong, I'm not bashing Tom's kits -- they are very nice.   If
> you have a supply of caps, solder lugs and terminal strips which a lot of
> us have, I would not pony up for the price of his cap replacement kit.   If
> you don't,  Tom's kits looka to be a good one stop shopping solution.
>
> 73 Mark K3MSB
>
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> On Tue, Apr 4, 2023 at 10:47 PM Robert P. Meadows <rpmeadow at bellsouth.net>
> wrote:
>
> Do the “RECAP”  correctly, purchase Tom Frobase’s capacitor kit, believe
> it is kitparts or such.  Slick printed circuit boards that hold the
> capacitors and fit the existing holes from removing the beeswax filled
> leaky tubs.  Works well, and I do believe that is what Aircraft Radio would
> have done, had such been available.
> R
>
> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On
> Behalf Of *Dennis Monticelli
> *Sent:* Tuesday, April 4, 2023 10:38 PM
> *To:* hwhall at compuserve.com
> *Cc:* arc5 at mailman.qth.net
> *Subject:* Re: [ARC5] BC-453-B Power Supply
>
> If you elect to not restuff the cap pots, it is easy to re-cap the set.
> Install a solder lug using the threaded stud that mounts the pot.  That's
> your ground.  Then it's typically three small caps (most are 0.05) from the
> lug directly to the stiff wires you cut from the cap pot terminals.
>
> Yes, lower voltage than 250V works fairly well.  My experience is to keep
> it at least 60V for decent gain and sure starting of the BFO.  The lower in
> voltage you go the more you're going to want to short out one of the R's in
> the screen voltage divider to keep the gain from decreasing too much.
>
> FYI.  My 453B pulls only10mA at 60V with new caps.  I've run it off a
> stack of 9V batteries and they last a long time.
>
> Dennis AE6C
>
> On Tue, Apr 4, 2023 at 6:57 PM <hwhall at compuserve.com> wrote:
>
> Those Command Set receivers had a B+ dynamotor that supplied 250v at 60
> mA. Many people operate the sets on lower B+.  If these little round
> "flower pot" caps are the ones you're looking at, they aren't soldered
> shut.  The edges are bent over the mica insulators.  Most people either
> trash the old cap pots or carefully remove, cut them open, restuff & either
> glue or solder the cut edge.
>
> Wayne
> WB4OGM
> -----Original Message-----
> From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
> To: arc5 at mailman.qth.net
> Sent: Tue, Apr 4, 2023 7:45 pm
> Subject: [ARC5] BC-453-B Power Supply
> I have a BC-453-B that has minimal hacks.
> At a recent hamfest I found a ARN-30 solid state dynamotor replacement.
> This power supply will properly mate with the receiver.
> Should this supply power the receiver properly?
> Some of the can capacitors along the side of the receiver are leaking.
> It looks like these have a soldered on top.
> Is it a lot of trouble to rebuild these capacitors?
>
> Thanks
> 73
> Glenn
> WB4UIV
>
> --
>
> -----------------------------------------------------------------------
>
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
>
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
>
> QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
>
> "It is not the class of license that the Amateur holds but the class
>
> of the Amateur that holds the license"
>
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