Duncan's 1960 Magnavox

[Username1]

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"I assume when I touch pins 3-through-6 of V10 it will cause the output plate of
V10 to cause vertical deflection? "

The Schematic says pin 3-6 which is usually pins 3&6 not 3,4,5,6 as in
3-through-6 you can see some pins to to heaters etc. Other stuff....


Also -

" The DC voltage yes, will not that high. But, with deflection working, the retrace
pulse/period produces a high amplitude spike in the primary, sometimes near
1.6kV. This for every frame, aka. 60 times per second of these pulses
(for vertical stage; 50 times for a lot of another countries). " Correct.

As long as the circuit is not functioning, no deflection, you can check the plate,
in a vert. or horiz. output circuit. And that is why in a case where "Do Not
Measure" is printed they often give a cathode current number you can
check. And proper way to check is to put the current meter in the circuit
by removing one leg of a resistor, or whatever runs from cathode
to ground. This is best practice. In this circuit you are also given
a voltage you can measure, but there is a reason they give you
current, and you should do it right, it can show other problems
in an otherwise working "looking" circuit. Too high a current
often means bias trouble, for example.


Cool that you found a possible cause for this trouble!

Good Night.


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