[Heath] DX-20 Transmitter: Results not good

[Wilson Lamb]

Sometimes you can keep something going by using a bridge rectifier on half the HV winding, if it originally used the center tap.

Are the LV windings OK?
If so, make a diode bridge with two 1KV PRV diodes in each leg and put it across the good side of the HV winding, if one side is still working.  Hopefully it only melted in one place.  Put 100K equalizing R across each diode, if you want to be careful.

I doubt if anyone is going to run that tx much and certainly not on AM, so you may well get by with the quick fix.

One sees junkers at hamfests, but I wouldn't do the work to change a TX unless I was being paid!

73,
Wilson
W4BOH
  ----- Original Message ----- 
  From: John Klingelhoeffer 
  To: heath at puck.nether.net 
  Sent: Sunday, April 22, 2012 2:14 PM
  Subject: [Heath] DX-20 Transmitter: Results not good


  Many thanks to those who responded to the earlier post about the DX-20 I'd been asked to look at by a fellow ham. 


  On the bench this morning, I found that the high voltage power transformer has an open high voltage (600-0-600) secondary winding.  So, I guess the overheating did destroy that component.


  I'll be contacting the owner to see how he wants to proceed on this.  Other than the transformer, it is in remarkably good shape for a transmitter of that age.  


  My appreciation to you all for your comments.  Perhaps there will be more from this rig in the future.  


  73         John...     WB4LNM     "One of the hams from Heath"






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