[Hallicrafters] Voltage question re SX-71

[Lee Bahr]

One more thing!  Different VOM (voltmeters) load circuits down differently.
Depending on the meter you poke into the radio has something to do with what
reading you get in different circuits.  (They load down the circuits
differently).  Hallicrafters could have used a different meter then you are
using when developing the voltage chart.
Lee, w0vt

> Yes, the B+ voltages are right on spec, so i think it is somewhere in the
> cathode bias/AGC circuitry, but am running out of things to replace :)
>
> The SX-71 has a fairly messy AGC/MGC/grid bias system, no two tubes using
> quite the same setup (unlike the NC183D in which all the RF and IF amps
use
> the same circuit) - a minor problem in grid bias voltages can affect the
> whole amplifier chain.
>
> Bob
>