[AMPS] Re: Amplifier Layout Techniques: Positioning of Filament xfrmr

[Jan-Erik Holm]

>Hi all,
>
>OK, here's another question for you amp gurus who have built several tube 
>amps.
>
>I would like to move my 4-1000 tube farther back into my RF cabinet.  The 
>reason for this is that I would then shorten the distance between the 
>anode and the vacuum variable tune C significantly.  This I think would 
>help layout a lot.
>
>The problem is that right where I want to move the tube is the filament 
>transformer.
>
>What I was wondering is if anyone has moved their filament transformers 
>off their RF deck.  Instead of coming into the RF deck with 220 Volts and 
>going to the transformer why not just step the voltage down outside and 
>going into the RF deck at the filament voltage.  Yes, I know that you 
>would encounter some additional ohmic losses with a longer length of 
>wire.  Also there might be possible RF bypassing issues, etc.
>
>Anyone have any ideas on this?  Is it kosher to do it or is moving the 
>transformer out of the RF deck asking for trouble?
>
>73,
>
>Jon
>KE9NA
>
>
I have done it both with 4-1000A´s and bigger tubes. Works great, no
problem, just go ahead and do it.

73, Jim SM2EKM


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