[Boatanchors] Homebrew Power Supply

Tue Apr 9 18:06:54 EDT 2013

If it needs 1400v CT then those 350-0-350v and especially 350-0-350v transformers will not cut the B Plus mustard.

Bry Carling
http://www.af4k.com
http://alltheaboveband.com

----- Reply message -----
From: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>
To: "mac" <w7qho at aol.com>, <drewrailleur807 at yahoo.com>, "- Cox" <w5jdy at cox.net>
Cc: "boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>
Subject: [Boatanchors] Homebrew Power Supply
Date: Tue, Apr 9, 2013 5:59 pm

The "factory" supply for the AF-67 is the PS-2V. 

It is rated to deliver nominal 6 VAC @ 6A, or 12 VAC 
@ 3A for filaments, 230 VDC @ 80 mA and 475 VDC
@ 170 mA.  Separate plate and filament transformers 
are provided. 

There is a 24 VAC tap on the filament transformer to 
be used for control or a bias supply. 

Outputs of the plate transformer T2 are 1400 V C.T. 
and 800 V C.T.

Output of the filament transformer T1 are 6VAC @ 1A 
for a 6X5GT rectifier, 5 VAC @ 3 A for a 5U4G rectifier, 
plus 6 VAC @ 6A or 12 VAC @ 3A for transmitter filaments
and 24 VAC @ .1A for control/bias.

Both high voltage circuits are full-wave using choke input
filtering. 

If you'd like to borrow my power supply manual to copy, Joe, 
let me know.

* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 

> From: w7qho at aol.com
> To: drewrailleur807 at yahoo.com
> Date: Tue, 9 Apr 2013 14:26:06 -0700
> CC: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Homebrew Power Supply
> 
> Let's see, this arrangement would require a transformer with a 
> 185-0-185 vac secondary good for at least 350ma. No idea where to 
> come up with such a unit.....
> On Apr 8, 2013, at 7:26 PM, Drew P. wrote:
> 
> > Joe Walden wrote:
> >
> > "Hello,from Joe w5jdy in Okla... I am in the process of building a 
> > power
> > supply for a Multi Elmac Transmitter model AF-67 and the Receiver 
> > PRM-7....
> > The particular specs I need is the power transformer secondary voltage
> > ?ac-0-?ac.... This voltage is rectified with a solid state bridge 
> > and has a 16 mfd input filter capacitor....... I need the output 
> > voltage to be 500
> > vdc at 250 ma..."
> >
> > I assume that the full wave bridge would be connected to the outside 
> > of the transformer's HV secondary winding, and that the bridge's 
> > negative end would be connected to common.
> >
> > With this arrangement and typical losses, 370 VAC to the full wave 
> > bridge would give you about 500 VDC with a capacitor input filter 
> > connected to the bridge's positive terminal. With the center tap 
> > connected to another capacitor input filter, that other filter will 
> > show about 250 VDC.
> >
> > Drew

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