[Boatanchors] Homebrew Power Supply

Tue Apr 9 18:27:07 EDT 2013

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
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>   		 	   		
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>