[Boatanchors] Advice Request on Heathkit HP-20 Power Supply

[D C _Mac_ Macdonald]

I just bought a Heath HP-20 power supply on the bay. 
It arrived today and is in beautiful physical condition. 
 
I opened up the bottom and found a lot of stuff that 
was NOT in the Heathkit manual. 
 
While I didn't try to draw a schematic for it, what 
was in the manual was mostly correct for the high and 
low B+ and C- supplies. 
 
The filament supply was something else!   It appears 
that a prior owner tried to rectify the filament supply 
to provide DC to "something." 
 
I removed all of that stuff and rewired the HP-20 to 
original wiring status. 
 
Next came a test of the outputs (no load).  Both B+
and the C- bias supplies had reasonable voltages. 
 
The rewiring of the filament section gave me a bit over 
14 VAC, no load. Again, reasonable without load. 
 
Then I decided to check the filament windings against 
ground.  OH, OH ! !  About 48 VAC from one side and 
about 36 VAC from the other side to ground! There is 
NO wiring from either side to ground. 
 
I'm guessing (never ran into this in 59 years as a ham) 
that the power transformer is leaky.  The HP-20 has 
had a two-wire cord installed; the known dangerous 
in-line fuse plug is gone. 
 
What are the dangers?  Could installing a three-wire cord 
help out here?  I sure don't want to risk electrocution! 
 
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* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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