[AMRadio] Diode information

[russ dworakowski]

Jim,  it  wud probably be  pretty tuff to  get  exact  replacements.
Generics  wud  be  better  anyway.   You  need  to see if  there  is  any 
voltage doubling  done  here,  in  the  supply.  You really  need to  
measure  supply  voltage  at the  diodes.  Then  its  just  a matter  of 
voltage rating.  The  current-250 ma.  is  not  going to  be a major  
factor. I know you  don't  want to  do  it,  but  a   few
1000v diodes in  series in  each   leg will be  a  lot  more  reliable.
Russ.


>From: "WILHITE, JIM" <w5jpwilhite at msn.com>
>Reply-To: amradio at mailman.qth.net
>To: "AM Radio Discussion list" <AMRadio at mailman.qth.net>
>Subject: Re: [AMRadio] Diode information
>Date: Sat, 20 Jul 2002 11:16:59 -0600
>
>Thanks for the response Russ.  Unfortunately I don't have the diagram of 
>this particular installation and remembering the plate voltage falls into 
>the catagory of wife's & kid's birthday, anniversary and such.  The tube 
>probably had 2000 or so volts on the plate and specs said 250 mils.  It has 
>been about 20 years since I worked on one of these and I just can't 
>remember.  But considering max plate voltage of 2000 and current of 250 
>mils for the application they were in, they must be rated on up there.
>
>Don't really want to build up 1N4007s in this particular project.  I will 
>look for some 1N2637s, they would look better but will do the 1N4007s if I 
>have to.
>
>TNX & 73
>
>Jim de W5JPW
>
>
>Sorry Jim,  nothing  specific on  those diodes.  Do  you have  a schematic?
>Easy  enuf  to  figure  value  of  replacements-  Do  you  know  how much
>B+  voltage  there is?   And  the  final  plate  current?  You  can  guess
>from  there,  as   for  diode  values.
>Just   use  general purpose replacements.  I  will detail more  if  you
>need?  Russ.
>
>
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