6992 Pre Amp PSU, whats wrong here?

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Alexrmc92

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Joined 2011
Heres a pic of a single tube 6992 tube pre-amp power supply that im working on. The top supply is for B+ and the bottom is for the heater.

Now in multisim i can only measure 50v no load on the B+ supply. If i remove the grounds and wire the top circuit together with wire instead of the grounds i get 100v. So is the bottom circuit somehow drawing current from the top circuit? Or is this just a multisim error? 100v no load is what im looking for on the top circuit.
 

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