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Old February 10th 05, 07:36 PM
Antonio Vernucci
 
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Thanks for the info. However, for the I-177 I have seen no calibration =
procedure. I guess everything relies on the fact that the potentiometer =
has the specified response.

73

Tony, I0JX

"Edward Knobloch" ha scritto nel messaggio =
news:[email protected]
Hello, Tony
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Sorry, I can't help you find that tube tester bias pot.
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One thing, though:
I know the TV-7 manual gives voltmeter readings
versus bias pot settings, set up using a military DC voltmeter
of only 1K Ohm/volt sensitivity.
The available voltmeter ranges were 0 to 10V
and 0 to 50V, so the load across the bias pot
was either 10K or 50K depending on the voltage
to be measured during calibration of the bias pot.
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I assume the I-177 was also intended to be calibrated
using a DC voltmeter of that sensitivity.
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73,
Ed Knobloch
=20
=20
depending Antonio Vernucci wrote:
The I-177 tube tester has a very unusual non-linear wire-wound =

potentiometer.
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Does anyone have an idea on whether any surplus store could have it =

on sale?
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Thanks and 73
=20
Tony, I0JX