[R-390] Nice find at tailgate swap yesterday

[Mahlon Haunschild]

Hello, list.

Picked up an older Heathkit IT-11 capacitor checker at a tailgate swap
yesterday for $10.  I've been shopping 'round for something more
sophisticated, like an old Sprague Tel-Ohm-Ike analyzer, but hey, for
$10,  who cares?

Gotta tell ya, this unit is way more capable than I thought it was going
to be.  The leakage test can be conducted at any voltage from 3 to 600
volts, which should cover most anything we are likely to come in contact
with in our R-390s.  And the capacitance bridge is reasonably accurate,
too.  Additionally, it can be used to determine transformer turns
ratios.

If you find one of these, know that apparently the older version of the
IT-11 used paper capacitors in the bridge circuit, which I had to
replace with polyesters before the thing would work properly.  The old
wax-covered paper capacitors leaked like sieves.

The IT-28 is apparently the same design, just in the newer tan-colored
Heathkit paint scheme.

The only drawback that I can think of is that these testers use a 6E5
eye tube, which is hard to come by.

The later version of the IT-11 and, I imagine, all of the IT-28s have a
dual-voltage power transformer.  Mine is 117 VAC only.

-- 
regards,

Mahlon - K4OQ

Icom IC-756 / IC-765 / IC-821 / IC-W32A
Drake R-4C / T4-XC / TR-4C / MN-2000
Gonset GSB-100
Johnson Viking Ranger / Viking Valiant
Heathkit Apache / Mohawk / Shawnee
Alpha 91b / B&W PT-2500A
National NC-303 / NCX-3
R-390A
Open Line of Credit with Gulf Power