[Wswss] Have for Sale

[Bob]

Hi all I have for sale the WD7S TRIODE CONTROL BOARD.

I got the kit including all parts from WD7S Productions. I have the board all wired. 

I was going to build a Triode amp but found I had a chance to get a Amerition solid state amp and do not
have use for the control board.
Here is what the board will do.
Grounded grid triode amplifiers require several forms of protection to
keep their tubes and operators safe. The control board described here
contains features usually found only in the most expensive commercial
amplifiers. These features are now available to those of us that wish to
“homebrew” our own equipment and have it virtually indestructible. The
following features are included in the control board and associated
circuitry:
·  Adjustable warm-up timer; holds off HV and key lines
·  Adjustable grid over-current protection, un-keys amplifier; auto reset
5-10 seconds
·  Adjustable grid over-current warning led, set below above trip
point
·  Adjustable plate over-current protection, shuts down HV supply in
less than 8.3 milliseconds avoiding damaging follow-on current
during a HV arc
·  Step-start HV turn-on, (soft-start) limits current inrush caused from
discharged HV PS capacitor
·  Tune/arc fault protection, un-keys amplifier when severely
mistuned or during tank circuit arcing, preventing component
damage; auto-reset 5-10 seconds
·  HV presence fault, holds off key line if HV not present or low after
warm-up
·  Air fault, shuts down filament supply if air flow not present within 5
seconds after power on, stops all other functions
·  Full break-in QSK, < 2 milliseconds, using vacuum relays
·  T/R fault - hot switching protection, stops amplifier from keying if
drive applied before key-line activated and prevents un-keying
amplifier if drive is present at cathode
·  Fully adjustable operating bias using a TL-431 adjustable precision
reference
·  Electronic bias switching, 2.5A max

I have the manual and assembled board for sale $100 . The cost to me was $135 unassembled.

E-Mail me or phone  at 661-829-5759

Bob wj6t