Fw: [Collins] RE: 51S-1 hot transformer

David Evans [email protected]
Tue, 6 May 2003 16:09:06 +0100


> Ed et al. I assumed this mod must be pretty standard.The mod was posted on
> the web by WB7DYW in 2000 and apparently it came from K5UGM. it had
already
> been carried out on this rig, which I picked up in the flea market in
> 1999...
>
> The 6BF5 is replaced by a 6AQ5 with two or three small changes. a 47k 1
watt
> resistor is paralleled with a 25uF 25VDC Cap between pin 2 and ground. A
> 330k half watt res.goes from pin 1 to ground. I didnt have a 6BF5 in any
> case.The justification for the mod was given as" for less drain on the
power
> transformer and cooler operation.It may save your power transformer."
>
> Yves, W4NI who has lots of experience restoring this receiver has just
sent
> a message advising against this.
>
> I seem to have discovered a point of disagreement!
>
> thanks to everyone for your interest.
> David CT4RL
>
> ----- Original Message ----- 
> From: "Ed Tanton" <[email protected]>
> To: <[email protected]>
> Sent: Monday, May 05, 2003 11:14 PM
> Subject: Re: [Collins] RE: 51S-1 hot transformer
>
>
> > Uh... what 6AQ5 mod?
> >
> > ///snip
> >
> > >Secondly the 6AQ5 mod had been carried out and thats whats in there
> instead
> > >of the 6BF5.
> >
> > 73 Ed Tanton N4XY <[email protected]>
> >
> > Ed Tanton N4XY
> > 189 Pioneer Trail
> > Marietta, GA 30068-3466
> >
> > website: http://www.n4xy.com
> >
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> >
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