5R4 and 5U4 solid state replacement on an Apache or Marauder

[Dan Osborne]

Patrick -

I do NOT recommend solid-state replacements of these rectifiers..for 
a good reason..

The plate transformer - especially in the HX-10 is really UNDERRATED 
and has a very large tendency to fail with a shorted
high B+ winding to ground. The increase in plate voltage would NOT be 
a good thing - IMHO.

Having been down this road I recommend that you use the tube type 
rectifiers AND try to run the units on 110VAC if possible to save
the transformers. Replacement is a big job - if you can find a 
transformer. Peter Dahl used to have them available for about $350 or
so if I recall - sigh..

Good Luck


At 10:27 AM 5/25/2009, Patrick wrote:
>Does anyone knows the pros and cons of replacing the 2 5R4 and one 
>5U4 on the Heatkit TX-1 or the HX-10 with a home made replacement as 
>described by K6MAY in the following link 
>http://www.k6may.com/CollinsTip2.shtml??? I just ordered the parts 
>from Mouser Electronics and would like to have a second opinion from 
>de Heathkiters................Pat PS it seems to me that just the 
>heat elimination and power load on the power transformer filament 
>portion is a plus.
>
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Dan L Osborne WB5AFY
wb5afy at wb5afy.net
972-839-6992 (cell)
EM04id 

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