Ground the cathodes as designed and try again.
Carl
----- Original Message -----
From: HOWARDLYON@aol.com
To: amps@contesting.com ; km1h@jeremy.mv.com
Sent: Friday, February 01, 2013 1:04 AM
Subject: NCL-2000
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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