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Old 20th November 2007, 07:14 AM   #1
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Default rewinding secondary on toroid

have seen the recent posts
i have plenty of 160va 25+25's

i want to rewind a ht for tube amp and a filament suppy

theres no problems doing that is there?
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Old 21st November 2007, 10:21 AM   #2
AndrewT is offline AndrewT  Scotland
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Voltage is the problem.
Then there are the logistics of controlling all that wire for the high number of turns required for a B+ supply.
The heater supplies are easy in comparison.

Keep in mind the turn to turn voltage if you start to multi-layer the toroid. Slight damage to the enamel insulation could create a fire hazard.
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Old 21st November 2007, 10:02 PM   #3
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well im planning to make the secondary 180 volts and use a voltage doubler rectifier for the HT.

Does this sound like a good idea?
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Old 21st November 2007, 10:22 PM   #4
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I think I should order the flowers now.
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Old 22nd November 2007, 05:29 AM   #5
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care to elaborate?
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Old 22nd November 2007, 06:25 AM   #6
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= It's not a good idea
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Old 22nd November 2007, 06:33 AM   #7
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i do understand the issues, i would like to know how to do it safely though.

I do know that winding a toroid with 10 metres of ecw could lead to cracks in the enamel and that very tough dielectric materials should be used to insulate these layers.
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Old 22nd November 2007, 09:16 AM   #8
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by guitar_joe
I do know that winding a toroid with 10 metres of ecw could lead to
and scratches and production flaws. 10m is never going to get anywhere close to 180Vac. More like 100m for a B+ supply.

How do you intend testing the insulation quality after you have rewound it?

BTW,
the flowers were for the funeral.
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Old 23rd November 2007, 03:43 AM   #9
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Default Re: rewinding secondary on toroid

[I f you have plenty of toroids why not stack them to get your voltage. You do not have to rewind anything 3 x 50V = !50V
or 4x 50 gets you 200. Filament transformers unles you use 25 V tubes.
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Old 23rd November 2007, 10:41 AM   #10
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alright so the idea is crazy... unless i have a proper winding machine it's not going to be safe. damn...

btw i could connect two toroidals back to back and get 230vac if i really wanted too. A guy i know in australia makes valve amps by doing that.

anyhoo dun worry bout the flowers... at the rehearsal studio there was a guy using a variac inplace of a transformer in the amp and there were bare live wires hanging out everywhere... give him the flowers.
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