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Here the? German 330 cfm @ .9" EBM Papst blower is installed below the top cover of the B+ power supply.? The oem thin top cover of the B+ supply was re-enforced with an identical sized cover, but 1/8" thick? 6061-T6..and placed above the oem cover.? ?The blower sits right above the paralleled pair of fil xfmrs.? The 3CX-6000A7 requires 204 cfm @ .4" pressure...with a 40 deg C? (104 deg F) intake air temp.? I carefully calculated with 306 cfm @ .9" pressure, anode dissipation would increase to 7200 watts CCS.? ?And with a more sane 25 deg C (77 deg F) intake air temp, the anode dissipation would increase to 7900 watts? CCS.? ?It's an easy tube to cool, due to it's 6.125" OD anode cooler, and it's small diameter...'ceramic stem'...(identical to a 3CX-3000A7).? ?IE: the under fin area of the 3x6 tube is big...a lot bigger than the smaller 3x3 tube.?

There is a pressure interlock switch incorporated into the RF deck plenum. Until the blower spools up to normal pressure, the interlock has been configured such that the B+ supply will not power on, nor will the filament supply, nor can the RF deck be keyed. It's all carefully interlocked. And if the blower failed during normal operation, the 240 vac primary of the B+? and? Fil supply? and the key line all go open. IOW, it's a fail safe circuit.