{Collins} Re: KWS-1 repairs



I agree with Dutch.  You do not need to install resistors when using SS
rectifiers in the KWS-1.  It is not the same as using SS rectifiers to
replace a 5U4 or 5Y3 in a lower voltage application.  A vacuum tube
rectifier has a voltage drop of about 50 volts. There is a very high percent
increase in voltage using SS rectifiers at about 300 volts.  This is not the
same as an 8-10 volt difference at 2000 volts.  The more important issue to
look at with the KWS-1 is the line voltage.  That can vary as much as 10
percent above the design voltage and that makes a 200 volt difference in the
HV supply.
Bill K2LNU
----- Original Message ----- 
From: "Ira Curtis" <kch@xxxxxx>
To: <k7dfw@xxxxxxxxxxxxxx>; <collins@xxxxxxxxxxxxx>
Sent: Wednesday, January 26, 2005 6:15 AM
Subject: {Collins} Re: KWS-1 repairs


> You will also need to install load resistors to compensate for the
original
> 866 voltage drop, that is if you care to keep the designed voltages on the
> final plates.
>
> 73's
> Ira Curtis
> CE3AM
>
> NO FIL, NO DEAL.
> NO GLASS, NO GLORY.
> NO GLOW, NO GO.
> ----- Original Message -----
> From: "ROLYNN PRECHTL K7DFW" <k7dfw@xxxxxxxxxxxxxx>
> To: <collins@xxxxxxxxxxxxx>
> Sent: Tuesday, January 25, 2005 11:31 PM
> Subject: {Collins} Re: KWS-1 repairs
>
>
> >
> > > The solid state tube replacements are easy.  You remove the 866 or
3B28
> > tubes, insert the SS replacement tubes into the sockets, push the plate
> cap
> > on, you're done.  They cost anywhere from $10 to $25 apiece, you need
two.
> > You shouldn't have to touch any HV filament transformer wiring.
> > ==================================
> >
> > Not exactly that simple.
> >
> > If the fil xformer is shorted then the secondary wires must be removed
> from
> > the tube sockets or at the xformer. If the fil xformer isn't shorted
then
> > the secondary wires should be removed to prevent a possible future
short.
> >
> > Secondly, Murphy's Law applies and the connection to the PS filter
> > components can be on the wrong pin of the sockets as the output of the
SS
> > diodes is only on one pin. This seems to occur more often then not.
> >
> >
> > K7DFW
> >
> > ..._._
> >
> > Sponsored by the Collins Collectors Association
> http://www.collinsradio.org
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> >
>
> Sponsored by the Collins Collectors Association
http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
> Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
> 1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
> Sun AM Net: 29.050 Mc-1200 Central
>
>


Sponsored by the Collins Collectors Association http://www.collinsradio.org
Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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