| I’m glad you have it going too Will, even though I was not of any help. Your comment about a “floating” power supply was enough get me thinking in that direction. About the rectifier. My old tube manual copyrighted in 1940 by RCA, shows all specifications for these two tubes as being exactly the same, including the pin out. My later manual copyrighted in 1975 shows that a 5Y3GT has a maximum current rating of 125mA at 380 volts, and 150mA at 245 volts. The 5Z4 was obsolete at this time and the RCA tube manual says to use a 5Y3GT for a replacement.
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Will Hodges 
TonyC 