[R-390] TEST EQUIPMENT RECOMMENDATION

[wli]

Harold:

The list has provided a comprehensive listing of test
equipment for you. I use a BNC T-connector off of my
URM-25F, and use my frequency counter as a readout of
this venerable RF generator. Should mention that a
"real"  VTVM is what you need at the diode load, not a
cheapo digital high impedance voltmeter. 

Capacitance values may be measured using simple 555
timer circuits. But for capacitor leakage
measurements, you will need a variable HV supply and a
VTVM. The HV supply can be also usd to rebuild an
existing electrolytic, if that is your wish (another
controversial subject). My homebrew variable HV supply
employs a small Variac feeding the primary of a junker
TV transformer (appropiately fused and user
insulated), and a simple LC filter. Parenthetically, I
was astounded at how NONE of my Orange Drops leaked,
and how many  of the vintage oil-filled and waxed
paper caps leaked at 250VDC.

Additionally, I found that 7-pin and 9-pin tube
extenders handy in measuring pin voltages when the
receiver is operating.

DeOxit is a fabulous product when used judiciously on
contacts. Much has been posted on how NOT to use this
chemical, but I wager we all still use it frequently. 

I found that a roll-around clear plastic 52 inch tower
set of drawers meant for clothes is a dandy way to
store spares: tubes, caps, manuals, what have you.
Mine is attached to a plywood base for rigidity, and
rolls around on four commercial grade 4 inch rubber
wheels. All the various probes, leads etc needed for
the test equipment are hung on the back of the plastic
tower on large clothes hooks. Goes where you need it,
and occupies a small of amount of valuable floor
space. One thing I plan is a similar roll-around
arrangement using a short 19 inch rack to have the
test equipment all together and off the workbench.

Thanks

W. Li
Mercer Island, WA



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