Here, all the final wiring has been completed, including the B+ between HV supply and RF deck.
Top lid of the HV supply, where the blower outlet is located, was modified, with 4 x pieces of 1" x 1" x 16" thick angle aluminum.
New angle pieces located between the blower flange, and? underside of the top lid of the HV supply.? ?These 4 x angle pieces will engage the
mating air inlet on the bottom lid of the RF deck.? ?3/8" gasket material sandwiched between? the 2 x flat surfaces.? This ensures an airtight fit.? The angle pieces protruding up, and into the RF deck bottom lid.... 'locks' the 2 x cabinets together, so the RF deck on top can't move about, when it's sitting on the HV supply below it.? ?HV supply is on casters...and? is easily rolled about.
Testing on the HV supply begins next week, time permitting. Then testing the various misc supplies inside the RF deck, vac relays, fil variac, blower, blower interlock etc, etc..... then the entire combo together, as one ensemble.?
Tube airflow requirements are? 204 cfm @ .4" pressure (with a 104 deg F inlet air temp) for the rated 6 kw CCS anode dissipation. The EBM Papst blower used on this 6m amplifier is rated for 320 cfm @ .9" pressure.? With the 50% increase in airflow, the anode dissipation is increased by 20%....to 7200? watts? CCS.? ?With a more sane 77 deg F inlet air temp, the anode dissipation is further increased to 7900 watts CCS.? When the cfm is increased by 50% (1.5), the pressure must be increased by the square of the cfm increase.? (1.5 x 1.5 = 2.25).? 2.25 x .4" = .9"
All that airflow is 1st drawn in through the pair of fingerguards on the HV supply, and past the various HV components,? plate xfmr, fil xfmrs, etc, before it gets sucked into the blower intake. That ensures? both the HV supply and RF deck remain cool at all times.? ?IF the blower ever failed, the pressure interlock switch would release, and ALL voltages are removed asap.? In normal operation, the air pressure in the? plenum has to be normal, before any voltages can be applied.? IE: both the RF deck + mating HV supply? will only function IF the blower is running.
The next project is currently in the design phase.? Consists of a 3CX-6000A7 operating on? 80-40-30-20-17-15m. (6 bands).? A variation of that is 160-80-40-20-17-15m. (6 bands). This will be? bandswitched (progressively shorting triple wafer model 88/85 switch / model 90 switch) and a bandswitched, manually tuned, PI tuned input.? Higher B+ voltage used.? Obviously far more complicated than the 6m amp.? 10 kw CCS output on data modes / 12 kw pep output on? SSB? +? CW.? ? Stay tuned for further updates.
