[Boatanchors] Homebrew Power Supply

Tue Apr 9 18:45:16 EDT 2013

Well, I have the power supply, the manual, 
and the cables.  I need to check to see if 
it will also run my AF-68 and PMR-8 combo. 

Too many projects for this old man! 

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

> Date: Tue, 9 Apr 2013 17:27:07 -0500
> From: cvest at cox.net
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Homebrew Power Supply
> 
> Yes I realized that . However these days , I can't say I have hardly any 
> big iron swinging and smoothing chokes laying around .
> 
> Just happens I have the identical ME pair that I moved up yesterday to 
> the cosmetic prep and clean up area of the bench .
> 
> I do not have a power supply for either of them , but it is going to be 
> a capacitor input supply for each of them .
> 
> Charlie , W5COV
> 
> 
> On 4/9/2013 5:18 PM, D C _Mac_ Macdonald wrote:
> > Did you folks not read that the Elmac supply
> > uses CHOKE INPUT filtering?
> > 
> > AND, that the power supply delivers 475 VDC
> > under load?
> > 
> > * * * * * * * * * * *
> > * 73 - Mac, K2GKK/5 *
> > * (Since 30 Nov 53) *
> > * k2gkk at hotmail.com *
> > * Oklahoma City, OK *
> > * USAF & FAA (Ret.) *
> > * * * * * * * * * * *
> > 
> > 
> >> CC: k2gkk at hotmail.com; w7qho at aol.com; drewrailleur807 at yahoo.com; w5jdy at cox.net; boatanchors at mailman.qth.net
> >> From: Chnord at comcast.Net
> >> Subject: Re: [Boatanchors] Homebrew Power Supply
> >> Date: Tue, 9 Apr 2013 18:12:06 -0400
> >> To: bcarling at cfl.rr.com
> >>
> >> That 6146 must be screaming in pain :)
> >>
> >> Carl Nord
> >> Sent from my IBM 360
> >>
> >>
> >>
> >> On Apr 9, 2013, at 6:06 PM, "bcarling at cfl.rr.com" <bcarling at cfl.rr.com> wrote:
> >>
> >>> 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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