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RE: Hi B+ on Morrison Micro (moved from Tube DIY Asylum)

I know that Morrison purposely runs the tubes hot and out of spec.

JC didn't advocate for the abuse of all tubes, just specifically the bi-plate 2A3. He has always insisted that the 15W max plate dissipation for the bi-plate 2A3's was an extremely conservative rating. The original 2A3 was a single plate for which the 15W dissipation makes sense but when the later tubes were converted to the dual plate version the maximum specifications were never changed. It is also important to note that JC is also an advocate of "Low and Hot" operating points. He prefers lower operating voltages at higher currents and it wouldn't surprise me if the chosen operating point of the 2A3 in the micro were 250V @ 80ma.

The easiest solution for you to quickly lose 30V or so of B+ is to reduce the size of the 10µF first cap in the poser supply. I'd start by cutting it in half to 5µ (I'd strongly suggest an oil cap here) and see where that leaves you.

dave

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