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With the resistor bypassed, this readout appears to work correctly with the DV-3M.
Since SG-TC2 outputs a more or less constant voltage for the TC gauge tube
heater instead of a more-or-less constant current as with SG-TC1,
it will work for other Hastings TC gauge tubes having the
same internal wiring except the DV-5 without any circuit
changes to the heater current supply. I have confirmed that the
DV-6M is compatible with my home-built control unit requiring only adjustment of the
heater current and atm offset. The SV-1R is a rack-mount
unit and I assumed that was what the "R" meant, everything
else being identical. A photo of the meter scale of another
old vacuum gauge matches that of the SV-1R and it has
"DV-3M" scribbled on the panel which would appear to confirm that the SV-1R is indeed designed to use the DV-3.
Approaches include the use of a dummy load for the
heater of the proper resistance and/or powering the control unit with a Variac and starting low
while monitoring AC heater current or voltage. CAUTION: Do not install a TC gauge tube other than the
one that SG-TC2 (or SG-TC1) has been set up for without making sure the heater current is less than the spec'd value
for the new tube.
The heater circuit can power the DV-3 at its spec'd current (though at the low end of
its adjustment range). Of course, the "Iset" position of
the Meter Select switch is just for confirmation as the TC gauge heater current should never need to be
adjusted after this for the remainder of the lifetime of the existing Universe unless the TC gauge tube
is replaced. In addition, for the DV-5 and DV-8, the op-amp circuit will need to be modified to have 5
times the gain since the high vacuum output of these tubes is only 2 mV
rather than the 10 mV for the DV-3, DV-4, and DV-6. But just in case I need a mobile rig,
the battery is still in place - a relay automatically switches to the adapter if AC
power is present. A battery powered control unit for the Hastings DV-4D TC gauge tube.
This unit uses a small Sola constant voltage (ferro-resonant) transformer for regulation rather
than zener diodes or a transistor oscillator fed from a regulated
DC supply. The NV-100 does one thing differently though: It maintains the DV-100 heater at
a constant temperature (within a limited current range) rather
than using constant voltage or current.
Failing to do this may result in instant destruction of
the tube by blowing the heater! So, either it uses a
different TC gauge tube (perhaps the very obsolete DV-1 or something even more ancient).
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the… I get Mhedi to pose for a portrait, but can't seem to get a good likeness.
This is because the heater voltage specs are relatively close to each other.
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