[AMRadio] B&W 5100 ps problem

[russ dworakowski]

Jeff,  its  worth  mentioning  here also that the  Hi B+  looad resistors  
were  open in  mine  {60k @  10 watts].  The pot modification
is  just  replacing  a resistor  with a sliding tap on it  with a pot.
Russ

>From: "Jeffrey J. May" <jeffreymay at worldnet.att.net>
>Reply-To: amradio at mailman.qth.net
>To: <amradio at mailman.qth.net>
>Subject: Re: [AMRadio] B&W 5100 ps problem
>Date: Mon, 4 Feb 2002 12:34:26 -0600
>
>Mike..K0MAZ is working on my B&W 5100 ..mod xfmr is ok..seems like the 2x2k
>resistors each go in series with the regulator tubes..this seems to make 
>all
>ok..would really like the factory mod for the mod bias if we can get
>it..thanks..Jeff..XV
>----- Original Message -----
>From: "russ dworakowski" <wb3fau at hotmail.com>
>To: <amradio at mailman.qth.net>
>Sent: Monday, February 04, 2002 12:52 PM
>Subject: Re: [AMRadio] B&W 5100 ps problem
>
>
> > Mike,  one of the earliest  factory mods to the 5100 was  installing a
>pot
> > for set up of mod bias. I  do not  have the schematic right now,
> > but  I  am thinking  you have a bad  mod  trans.  they do run very hot.
> > Good  luck, and I hope I am wrong.  Russ
> >
> >
> > >From: "k0maz" <k0maz at msn.com>
> > >Reply-To: amradio at mailman.qth.net
> > >To: "Old Tube Radios" <boatanchors at theporch.com>
> > >CC: <boatanchors at mailman.qth.net>, <amradio at mailman.qth.net>
> > >Subject: [AMRadio] B&W 5100 ps problem
> > >Date: Mon, 4 Feb 2002 06:23:18 -0600
> > >
> > >Greetings All,
> > >
> > >Working on a 5100 with a ps problem -- it eats OC3's (70 ma. going
>through
> > >them).
> > >The photo and parts list show a 2k/10watt resistor pair (R-62), but
>it/they
> > >are not on the schematic.  Original problem was no modulator idle 
>current
> > >caused by an open R-49 tapped bias resistor (full -105 volts on the
>grids).
> > >
> > >Anybody seem a corrected schematic?
> > >
> > >Thanks/73,
> > >
> > >Mike Warren - K0MAZ
> > >
> > >
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