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Author Topic: Parallel transformer or have one Custom made  (Read 2975 times)
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Ac8wp
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« on: September 06, 2020, 10:13:57 PM »
Hi all!
I'm building a power supply for my tube gear and I am having difficulty finding a transformer that can supply the current i need. Should I just parallel 2 of the same model or have one custom made?  Any good places to have one made?
AC8WP-Jesse
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WBear2GCR
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« Reply #1 on: September 07, 2020, 10:29:55 AM »

Specifics make a difference.

What tubes, what voltages , what current, etc??
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w4bfs
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« Reply #2 on: September 07, 2020, 10:33:48 AM »
I like the toroids I have gotten from antekinc.com
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Ac8wp
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« Reply #3 on: September 07, 2020, 04:31:21 PM »
Quote from: WBear2GCR on September 07, 2020, 10:29:55 AM

Specifics make a difference.

What tubes, what voltages , what current, etc??


The power supply I am building is for multiple radios. Art-13, arc-5, arc-1, #19 set, grc-9, exc. most of which are 600v, 540v, 400v, 240v(300ma) and 275v(300ma). Im leaning towards having one made with multiple taps so I can save room in the shack for more toys and less iron.
I know the art 13 dynamotor provides about 750ma + 60ma for the receiver so im thinking 1a would be a safe bet if I want room for it to power larger equipment in the future.

So far i have chokes diodes, resistors and caps in the pile of parts, only thing left is the transformer.

AC8WP
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W7TFO
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« Reply #4 on: September 07, 2020, 10:03:59 PM »
Hit me up thru a PM here (I sent you an E-mail but no QSO).

I have hundreds of transformers and ought to be able to help you.

73DG
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WBear2GCR
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« Reply #5 on: September 07, 2020, 11:20:35 PM »
One way to go involves one basic transformer and a Variac + meter to monitor the output voltage...

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Ac8wp
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« Reply #6 on: September 08, 2020, 01:46:56 AM »
Quote from: W7TFO on September 07, 2020, 10:03:59 PM
Hit me up thru a PM here (I sent you an E-mail but no QSO).

I have hundreds of transformers and ought to be able to help you.

73DG

Will do,
 I will check my email and send the specs sometime tomorrow. I haven't checked it as of yet. Do you need the specs on the individual voltages? I can provide more detailed info if needed.
73
AC8WP
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WBear2GCR
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« Reply #7 on: September 08, 2020, 12:09:10 PM »
Remember now, transformer voltage is NOT = output voltage!!

Really, the variac solution solves many problems in one shot.

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Ac8wp
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« Reply #8 on: September 08, 2020, 05:19:12 PM »
Quote from: WBear2GCR on September 08, 2020, 12:09:10 PM
Remember now, transformer voltage is NOT = output voltage!!

Really, the variac solution solves many problems in one shot.

                          _-_-

Yes, I have accounted for the voltage drops on the chokes.

I could use a variac but I usually save that for experiments. I wanted to have fixed voltages for ease of use. But your right a variac would solve a lot of problems.
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WBear2GCR
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« Reply #9 on: September 08, 2020, 06:47:08 PM »
Get another variac would be my advice.

Again, look at the connection options for the secondary of a transformer - choke input or not.

                                   
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