Simpson 1000 - Page 16

10.
IL.
12
13;
14
TUBE INFORMATION
placed in the socket, its cathode will be grounded
through the #5 base pin.
Set the F toggle at 2. This connects the #6 terminal of
the octal socket to the section of the LINE TEST which
will furnish screen voltage when you press the LINE
TEST switch. At present, this switch section connects
the #6 terminal to ground. When you place the tube in
the socket, its screen grid will be connected to ground,
and will be transferred to screen voltage when you
press the LINE TEST button after the short tests.
Leave the G toggle at 0. This setting grounds the #7
terminal of the octal socket. When you place the tube in
the socket, the filament return will be connected
through its #7 base pin to ground. The filament circuit
will be complete and the tube filament will heat.
Set the H toggle at 3. This setting connects the #8 ter-
minal of the octal socket to the switch section of the
LINE TEST switch which will furnish plate voltage
when you press the LINE TEST button. At present, this
switch section connects the #8 circuit to ground. When
you place the tube in the socket, its plate will be con-
nected through the base pin #8 to the circuit which is
grounded and will be transferred to plate voltage after
the short tests.
The I and J toggles are set at O. These toggles are con-
nected to the #9 and cap lead circuits which are not
used for this octal base tube. The normal position for
toggle switches in unused circuits is 0, to connect the
tube tester circuits to ground. When the 6AG7 tube is