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Dominik wrote:

Tribute give me best price... Romy, Can You help me with choosing L1, L2, L3, L4? http://www.hammondmfg.com/5cchk.htm And DL1, DL2 http://www.magnecraft.com/time_delay_sensor_relays.php

Dominik,

The Magnecraft relays are excellent, so the Hammond chokes. In fact the Hammond chokes in my view even better then they shall be. The Tribute transformers are very fine but I am bit not at ease with what I see. He specified the 350mA amorphous transformer for 260Euro. That is very conservative price and therefore I wonder what the core size he will be using. Current offsets inductance and inductance offsets LF. If he whatever core size he uses gaps it for 350mA then how much inductance will be left? He needs to give you the inductance number at 350mA, 300mA, and 250mA. I afraid that at 350mA it will be 7H-8H left and it will be too low. If you drive this thing at 200V then at 300mA you are already at max plate dissipation, so unless you go for 160V-170V (that I feel a bit too low) then you would not need 350mA. Probably the optimum for a full range operation to have 200V and drive the tube at 200-250mA, that would make a cup for 270A-280mA good enough. With all of it you need to have 10H and up. An amorphous transformer for 260mA and 11-12H and with a price tag of 260Euro? Sounds too good to be true. Hm, can I have one extra pair for myself? For a full-range operation you need to target LF cut off at 15Hz, you will end up with 17Hz-18Hz, at full-power of cause.

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