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[Amps] Transformer Noise

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Subject: [Amps] Transformer Noise
From: Ian White, G3SEK" < (Ian White, G3SEK)
Date: Wed, 14 Aug 2002 22:33:12 +0100
John wrote:
> I have three amps ....SB200 , SB1000, Dentron Clipperton L ..... They all
>work fine ,But the SB1000 & Clipperton both have Transformer Buzz & hum. The
>SB200 transformer is  super quiet ..... Why is that ??  What is heathkit
>doing that the other are not ?? Can I do anything about it......

In the SB-1K, more than half the noise seems to be coming from the steel 
cover, vibrating in the stray magnetic field. Changing to a non-ferrous 
cover would probably help.

73 from Ian G3SEK         'In Practice' columnist for RadCom (RSGB)
                            Editor, 'The VHF/UHF DX Book'

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