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Hastings NV-8B control unit for the DV-8 TC gauge tube.
After calibration using my DB-18 which is the reference
tube for the DV-5, it now tracks my NV-8B (DV-8)
readout fairly closely which gives me some confidence that
both the readouts are accurate and the reference tube hasn't leaked too much.
It is now happy with a DV-4AM tube. Hastings CVT-26 vacuum controller
for the DV-6M TC gauge tube. Of course, I messed it up in the first
place so if you must know, see the section: Repairing the Taut
Band Suspension of the Meter in a Hastings CVT-16. There can be faults like
the freezer can make excessive noise and it can fail to run, if there is
any leakage from the refrigerator then you must check the tray,
if it is placed rightly and if there are any inner leakages then instantly contact a professional agency.
Professional company, easy to deal with. I purchased a DV-8M TC gauge tube from OE Technologies for about half the price new
from Duniway (see the OE Tech High Vacuum Components and Equipment Page.
What's available now can be found at Sam's Classified Page
under "Vacuum Equipment and Accessories".
I recommend him and now all my… Every now and then, they'll say that they
had to replace an old part. JENN-AIR Appliance Repair in Calabasas
is a privately held company with European principals who understand the Old World
practices of staying in continual contact with customers, serving as educator and repair resource,
and, going above and beyond services typically provided by other service appliance repair companies.
An LM317 or other older adjustable IC regulator could be used instead
of the LT1084 but might require a minimum input voltage
slightly above 5 VDC due to its higher dropout voltage.
At the low current, even a heatsink is optional but won't hurt and would permit
input voltages up to the limit of the LT1084 regulator (35 VDC) but don't forget to use an appropriately rated capacitor for C1!
The only required change to be compatible might be
a resistor to adjust the heater current but even that may not be needed as the output may very well end up being within the adjustment range for the higher resistance of the DV-6M tube.
The input to the meter is amplified and offset to expand the range
between 0.1 and 10 mTorr but this sacrifices any reading above 10 mTorr (the useful sensitivity range of the DV-8 tube appears to reach at least 100 mTorr even though this is not shown in the Hastings specifications
for the tube).
Surrey Appliance Repair professionals can handle a broad range of problems with most family devices.
The following applies generally to older thermocouple and other similar
devices like Pirani gauges. The following is a description and
schematic for a regulated inverter type driver which
can be adapted to just about any TC vacuum gauge by winding a
(simple) transformer and using the proper meter.
All of the transformer grade ferrite cores saturate at about 2,500 to 3,
000 gauss, so the frequency of operation will depend on the particular ferrite material and core
size that is used but it is not critical. The transformer consists of a small pair of ferrite
"E" cores having a center leg diameter of approximately 0.190 inch.
But almost any small ferrite core from your junk box will probably be fine.
This will minimize the AC component in the output signal.
Alternatively, monitor the output signal from the gauge
tube and hand adjust the secondary winding
position for minimum ripple, then apply hot-melt
glue or other adhesive to keep it from moving. Notice that the secondary winding on the transformer
is only one (1) turn, which should be on top of the primary winding and
spread out across that winding.
Like the SV-1R, above, they use a small Sola constant voltage (ferro-resonant) transformer for
regulation. The other unit also works though its meter
is somewhat broken and sticky so constant tapping
is needed while taking readings but it's still useful for testing since
it would be no great loss if the meter blew up. Clear nail polish
around the gauge tube after you thread it in and while the vacuum
is on. Several Hastings CVT-16 vacuum controllers for the DV-6M TC gauge tube.
This one (genuine Hastings throughout) uses an oscillator to drive
the tube heater with a regulated AC voltage. If for some reason you wish to lower the frequency of the saturating core oscillator (for long runs and/or
to reduce RFI), turns may be added to both the primary and secondary coils, but keep the
ratio of the windings the same. The versions for the Hastings tubes will run at a lower frequency
due to the higher number of primary turns. To make sure that none of the plans become scuppered by an oven looking for repair, these experts give a professional, reliable and guaranteed repair service on the
number of kitchen appliances, including an assortment of models and makes of ovens.
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