[Amps] High frequency heater supplies

[Val]

This probably is connected with the possibility of using switching mode
power supply on the filament xmfr's place. There are a lot of such
transformers manufactured for feeding 12 volt halogen bulbs rated from 50 to
200 watts. They are small, light and cheap. The RFI is under question.

Val  LZ1VB


----- Original Message -----
From: "Steve Thompson" <g8gsq at eltac.co.uk>
To: <amps at contesting.com>
Sent: Thursday, July 13, 2006 5:37 PM
Subject: [Amps] High frequency heater supplies


> Does anyone know if there are problems using high frequency (say 30kHz)
> ac to run the heater in a valve with a cathode? For that matter, the
> filament in a valve without a cathode?
>
> Thanks,
>
> Steve
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