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Toroid Power Transformer For GM-70 845 211 1000V
Toroid Power Transformer For GM-70 845 211 1000V
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Old 28th April 2014, 11:43 PM   #1
HP8903B is offline HP8903B
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Default Toroid Power Transformer For GM-70 845 211 1000V

Does anyone know where to buy a toroid power transformer with two 1000 - 1100 volt winding ?

Or 2000V to 2000V with CT ?

I want to power the GM-70 but I don't want to use a bridge rectifier.
 
Old 29th April 2014, 01:53 AM   #2
mike567 is offline mike567  United States
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maybe this:

AS-15T950 - 1500VA 950V Transformer - AnTek Products Corp
 
Old 29th April 2014, 02:04 AM   #3
HP8903B is offline HP8903B
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Too big and voltage too low.
I want to use choke input
 
Old 29th April 2014, 02:12 AM   #4
kevinkr is offline kevinkr  United States
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Toroid Power Transformer For GM-70 845 211 1000V
What is your target output voltage? A 950V toroid is going to give you at least 1300V in a CLC, there would be a problem with choke input admittedly..

I use ~700V custom wound transformers from Edcor in my GM70 amps and get a little over 1kV @ 125mA out from a CLCLC filter with a SIC bridge.

The GM70 is rated for a maximum of 1500V, and I have to admit that I am very careful around the 1kV in my amps. (Testing done with covers in place, and diagnostics done with the HV secondary disconnected.) Corona when it is present is quite audible, problem is now minimal, but some new tubes make some very odd noises on first power up and until the bases bake out. Running over 2.5yrs now with no failures.
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Old 29th April 2014, 02:13 AM   #5
mike567 is offline mike567  United States
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I have one of their smaller transformers and it puts out about 10% more voltage . the trans former has 2 - 950 volt windings but it is BIG!
 
Old 29th April 2014, 02:17 AM   #6
HP8903B is offline HP8903B
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What do you guys think about using this:

AS-4212 - 400VA 12V Transformer - AnTek Products Corp

Wired in reversed ?
 
Old 29th April 2014, 02:20 AM   #7
kevinkr is offline kevinkr  United States
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Toroid Power Transformer For GM-70 845 211 1000V
Are you talking about connecting the 12V winding directly to the mains? If you are the number of turns are far too low and massive amounts of current will flow in that secondary winding, also core will saturate and I suspect you will have a great deal of smoke for your trouble.

Not a good idea, have you ever designed or built an amplifier running at anything like these voltages? Mine was my first and I waited 30yrs before building one running at these elevated voltages.
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Old 29th April 2014, 02:22 AM   #8
AndrewDGC is offline AndrewDGC  Ireland
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In your country there is an incredibly helpful bunch of people at the Toroid Corporation of Maryland: Custom Design Toroidal Transformers
I have purchased from them "mail-order". Apart from a range of off-the-shelf items, they can assist with any design you want, and even offer a "kit" service.
Tell them the guy in Ireland recommended them as he promised he would.
 
Old 29th April 2014, 02:23 AM   #9
HP8903B is offline HP8903B
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Thanks for the info
 
Old 29th April 2014, 03:03 AM   #10
chrish is offline chrish  Australia
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Anybody wishing to contribute to this thread may wish to look at this locked thread first before deciding if they are going offer any advice.

Capacitor Drain for Tube Bench Power Supply ?

In my line or work, a big difference between ability and ambition (ego) kills people. In this hobby, there is the same danger.
 

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