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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. The SV-1R is a rack-mount unit and
I assumed that was what the "R" meant, everything else being identical.
This would be beneficial for the purchaser as then he wouldn't
need to worry in the time being consumed. No matter the model you have chosen, if you need Amana oven repairs, don’t settle for anything less than the best.
But you should realize that such a person may not have the requisite knowledge to actually carry out the repair.
Nothing is perfect and the bit of dither may help a meter
with sticky bearings. Cool temperatures help ensure everyday food items like meat maintain their
shelf life and stay safe for you to eat. Work hard to keep a constant temperature
- The Subzero appliance repair Orange County will help
you to cut the length required after buying a one size fits to the
gasket.
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 simpler approach of using a pair of blocking diodes would have dropped the battery voltage by 0.7 V which would greatly reduce its useful life; using the switched contact
on the adapter jack would not permit selecting between the regulated
9 VDC and battery. 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.
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. 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.
A shorted cap is apparently a common failure with this design as one of
the other units I obtained using this approach had had its cap
replaced in the past. Later, after noticing that the line regulation of the simple zener circuit wasn't that great, and in addition, the
reading was drifting as the gauge heated up, I replaced the AC input
circuitry with a low voltage power supply consisting of a 12.6 VRMS centertapped transformer, full wave rectifier, filter capacitor, and LT1084 regulator
set up for 6.0 VDC, which was slightly less than what I measured across the zener but the adjustment pot had plenty of extra range and that allowed me to use a transformer I had gathering dust on my transformer shelf.
The op-amp has plenty of head-room. Or, for the purist, a capacitor can be added in parallel with the resistor in the feedback path of the op-amp to implement a low
pass filter. There is no "AC Null" adjustment - if the
number of turns on each half of the windings of T2 are equal,
the only ripple at the output of the op-amp will be due to
the unequal resistances in the two halves of the TC gauge
heater.
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 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. Discover how Fix Appliances is getting a 5-star service
record since day one. When Silver Saints professionals come to service Insinkerator problems, we
check everything on the unit from the sink flange to
the discharge tube. I called CRC Appliance Repair to come out to my house and service our Freezer as well as our Washing
machine. We've even taken the hassle out of booking your appliance service appointments.
So, either it uses a different TC gauge tube (perhaps the very obsolete DV-1 or something even more ancient).
However, there is a resistor of about 15
ohms in series with the DC output of the TC gauge
tube (pin 7) which results in the 10 mV meter movement actually requiring
approximately 14 mV for full scale deflection. For
tubes other than the DV-3, the meter reading for the "Iset" position of the Meter
Select switch won't be exactly full scale but can be recorded
as an aid in initial calibration.
my blog - "http://Wiki.Rl-Transport.org/index.php/User:ScottRuggles |
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