Hi Carl
Finally getting back to the NCL-2000. I shotgunned the HV supply and a
new HV relay a couple years ago. Same deal as the SB-220 PS job; 105*C
radials in series/parallel; new diodes and bleeders. The Heath has been
purring
for two years now, so should oughta work for the National, too. Finally
getting back to it now.
I did the Kathode resistors (33-ohm x 3 for each socket). Think that was
a Rich Measures mod.
Fired her up with the interlocks defeated. Adjusted bias for 225mA.
Tuned and loaded for 40m into a Cantenna. Drove her with my olde TS-530;
adjusting drive with the Carrier control.
Two things noted..... only about 3-5mA of grid.... and the screen metering
jumps to about 40 or 50, and then slowly rolls back to 15mA.
Do I use the initial jump, or the pacified 15mA for the critical screen
load? Do I need more C shunt on the screen metering?
Is the <5mA grid OK? Or, indicative of....?
Thinking of installing a 160 mod over top of the fan motor; around the
phenolic, anti-shorting stick; and over the plate resistor and output choke.
I have about 2" high x 4" wide x 8.5" long. Looks like enuf room for the
toroid over the blower, the vac relays hanging between the blower and the
stick, and the padders over the choke and the SO-239. Even enuf room for a
small relay PS, I think. Is this worth the trubs? Gud or bad idea?
Thanx for the help.
Unca Billy
N3TR
Wm. H. Taylor
General Contracting and Design
2249 Hickory Hill Rd
Oxford, PA 19363
610-932-3762 h
484-643-3220 c
n3tr@arrl.net
Historical Restoration; Custom Stonework; Fireplaces
Star Bolts; Structural repairs
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