Rectifier TUBEs
(common in 'most' tube guitar amps)

Tube

Filament Current

reduction in B+

DC forward drop

Cathode heating

83 3A 2-3% 12-20V cold-Hg vapor
5AR4/GZ34 1.9A 3-7% 17-30V indirect
5V4 2A 6-12% 25-40V indirect
5U4 3A 8-16% 35-50V indirect
5R4 2A 12-22% 40-60V direct
5Y3 2A 13-23% 45-65V direct

Indirectly heated   Directly heated
  

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