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

[Patrick]

Thanks Dan, I had a hunch that that would be the case with the Marauder, will heed your advise on that one...... Pat ......  PS: By the way, all of my old boat anchors run on 108Volts from also an old Variac (5KW) from an older theater, it has a wheel that looks like a submarine hatch, it runs all of my workshop, the light bulbs last twice as much as in the rest of the house.
  ----- Original Message ----- 
  From: Dan Osborne 
  To: Patrick ; HEATH at LISTS.TEMPE.GOV 
  Sent: Monday, May 25, 2009 3:32 PM
  Subject: Re: [HEATH-TEMPE] 5R4 and 5U4 solid state replacement on an Apache or Marauder


  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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