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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Hammond filament transformers - primary voltages posted by Kiwi Brian on March 29, 2007 at 02:18:02:
After you plug it in and your lights all go out, you won't be so concerned about regulation...The primary has JUST enough turns to support 117V (actually about 125-130) before the flux in the core reaches the saturation point. Higher voltage (or lower frequency, which allows longer for the flux to build) will result in greatly increased current as inductance is dropping. 100V at 50 Hz would be OK... or 230V at 120 Hz, though core loses would be up, and insulation would be marginal.
Hammond 266M2 has dual 2.5V secondaries which will give you 5VCT or dual 2.5V windings. If you want a center tap for 2.5V, use a pair of resistors to split it - or a hum pot.
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Follow Ups
- Re: Hammond filament transformers - primary voltages - Tom Bavis 05:30:31 03/29/07 (4)
- Re: Hammond filament transformers - primary voltages - Triode_Kingdom 12:04:32 03/29/07 (2)
- I use a little primary resistance - Jim Hagerman 12:35:01 03/30/07 (0)
- Re: Hammond filament transformers - primary voltages - John Swenson 12:24:14 03/29/07 (0)
- Thanks Tom - Kiwi Brian 11:54:33 03/29/07 (0)
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