Hi guys
Trying to renovate an old NCL2000. Hadda shotgun the doubler board. The
caps were teenagers with pimples and whiteheads everywhere. The dividers were
all outta spec... 75k to 120k!~!~! New board is 12 pairs of 68uF/450V/105*
radials (about 11uF/5+kV) shunted by 12 100k/5W; new bypassed diode stacks;
Dale 25W heat-sinked limiter resistors; on a 3/16 XX phenolic board with
grommeted mounts and silvered test pin connections.
Replaced the caps in the grid supplies. Replaced and bypassed alla the
diodes. Replaced the smoked HV control relay. Made the wiring change to the
two
75k bleeders.
The screen supply txstrs test OK, but the resistance measurements through
the network are all well beyond 10% out. Anybody ever notice this? Any ideas?
What is the ALC output? My IC746 accepts 0 to -4V. The circuit looks like
it puts out much more than -4. Attenuator time?
Thanx fellas.
Unca Billy
N3TR
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