11 Jul
2007
11 Jul
'07
6:40 a.m.
From: "Chuck Guzis" <cclist at
sydex.com>
On 10 Jul 2007 at 21:31, dwight elvey wrote:
Hi Chuck
Ok, are we allowed to use a vacuum triode? Using high voltage
to help linearize the saw tooth seems to be the sledge hammer
method.
What was it that Tektronics did with tubes to get the nice
linear sweep? They did something that used a constant current
to charge the capacitor.
Dwight
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You could also put a current source instead of a
resistor.
This can be made with either a transistor and s few resistors
and diode or a jfet.
Uh, Dwight, we're talking "vintage" gas triodes here. If I had a
transistor of any sort, why would I be messing with neons or
thermionic gas triodes?