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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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