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Tube Preamplifier 5687 Led Biased Circuit Diagram

The RCA-83 rectifier makes use of 5VAC for the filaments. The heaters for the 5687 tubes are provided from a full bridge of MUR860 diodes, followed by 5 x 10,000uF Elna caps. 830mA of current regulation is supplied using a LM317 regulator plus a 1R5 resistor between ADJ plus VOUT pins. Votlage to the tubes is about 11.5V, so I am actually running starved filaments.The power supply makes use of

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