[Boatanchors] Homebrew Power Supply

Tue Apr 9 18:46:21 EDT 2013

It was a joke

Carl Nord
Sent from my IBM 360

On Apr 9, 2013, at 6:18 PM, D C _Mac_ Macdonald <k2gkk at hotmail.com> 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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