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1. [Amps] 813 Filament Transformer (score: 1): Author: "Steve Flood" <flood@ixi.net>; Date: Tue, 23 Jan 2007 04:45:15 -0700; I am building a 2x 813 amp and am looking for a filament transformer. I need some coaching on a couple options since I cannot seem to locate a proper 10V 10A transformer. 1) Use a 13v @ 20A transform; /archives//html/Amps/2007-01/msg00242.html (6,421 bytes)
2. Re: [Amps] 813 Filament Transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 24 Jan 2007 12:27:01 +0000; Either should work fine - it's fairly uncritical. I used a pair of 4.5V 50VA transformers - 4.5V is a common stock voltage over here - which also provides a convenient centre tap. Don't forget to rem; /archives//html/Amps/2007-01/msg00244.html (7,097 bytes)
3. Re: [Amps] 813 Filament Transformer (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Wed, 24 Jan 2007 07:40:07 -0600; You possibly could use a transformer out of an old battery charger. These usually were half wave power supplies with no filter cap and 6 and 12 v switch over here anyway. (center tapped) You could th; /archives//html/Amps/2007-01/msg00245.html (9,231 bytes)
4. Re: [Amps] 813 Filament Transformer (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 24 Jan 2007 17:35:56 +0100 (CET); Another possibility is to use the 13 volt transformer with a 25 ohm, 30 watt resistor in the primary. You might want to make it an adjustable resistor, but it would have the additional advantage that; /archives//html/Amps/2007-01/msg00246.html (7,390 bytes)

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