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Here is a proposal for an alternate bandswitch design - to eliminate the =
arcing problem between the contact and rotor.
In the simplest form, imagine a 1/4 inch metal shaft coming out of the =
front panel of your amp. It would go through a bearing which is =
grounded. As you pushed it back, it would contact more and more =
contacts and ground those points. Spacing could be very high. =20
The problem with this design would be that: (1) you normally do not =
ground the switch points and (2) a lever sticking out of the panel is an =
invitation for disaster. But, once the concept is understood, those =
problems can be solved. =20
Let us then rotate the shaft vertically and instead of a push - pull =
shaft out of the front panel, a knob would be placed on the front panel =
and parallel to the shaft, which would actuate like a sliding volume =
control. As the knob went up and down, it would move a shaft that would =
"short" out additional contacts. Detents would be in place to assure =
positive stops. Now, because the shaft is not exposed, we need not have =
it grounded. Instead, it could be insulated from ground with the coil =
right behind it to short out progressive taps.
One negative is that it would not easily allow engagement of a =
conventional switch for the cathode input circuit. It would work well =
with untuned input or a similar arrangement could be ganged for the =
tuned input circuit. Or, a parallel shaft could operate remote relays =
for the input circuit. =20
73, Colin K7FM =20
=20
------=_NextPart_000_0007_01C03451.C42C3240
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<DIV><FONT face=3DArial size=3D2>Here is a proposal for an alternate =
bandswitch=20
design - to eliminate the arcing problem between the contact and=20
rotor.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>In the simplest form, imagine a 1/4 =
inch metal=20
shaft coming out of the front panel of your amp. It would go =
through a=20
bearing which is grounded. As you pushed it back, it would contact =
more=20
and more contacts and ground those points. Spacing could be very=20
high. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>The problem with this design would be =
that: (1) you=20
normally do not ground the switch points and (2) a lever sticking out of =
the=20
panel is an invitation for disaster. But, once the =
concept is=20
understood, those problems can be solved. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Let us then rotate the shaft vertically =
and instead=20
of a push - pull shaft out of the front panel, a knob would be =
placed on=20
the front panel and parallel to the shaft, which would actuate like a =
sliding=20
volume control. As the knob went up and down, it would move a =
shaft that=20
would "short" out additional contacts. Detents would be in place =
to assure=20
positive stops. Now, because the shaft is not exposed, we need not =
have it=20
grounded. Instead, it could be insulated from ground with the coil =
right=20
behind it to short out progressive taps.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>One negative is that it would =
not easily=20
allow engagement of a conventional switch for the cathode input =
circuit. =20
It would work well with untuned input or a similar arrangement =
could be=20
ganged for the tuned input circuit. Or, a parallel shaft could =
operate=20
remote relays for the input circuit. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>73, Colin K7FM =
</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
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