User's Manual

RANGE switch are set as in a(2) through (4) above, and the

FILAMENT VOLTS meter indicates 6.3 volts,

(1) Set the PLATE switch to the 5 position.

(2) Set the PLATE-SCREEN RANGE switch to the S posi-

tion.

(3) Adjust the PLATE fine control until the PLATE meter

indicates 20 volts ac.

(4) Turn the quality SHUNT control to 90.

(5) Set the GM-SIGNAL RANGE switch to the A position.

(6) For the TV-2/U, aline the dot on the knob of the GM

CENTERING control with the dot on the panel. For

the TV-2A/U and TV–2B/U, aline the line marking on

the GM CENTERING control with the line marking on

the panel.

(7) Depress the PRESS TO TEST P2 switch and read the

PERCENT QUALITY meter. If the indication is less

than the minimum limit of 25, discard the tube. If the

indication is satisfactory, measure the emission of diode

No. 2.

h. Measurement of Emission (Diode No. 2). To measure the

emission of diode No. 2, adjust the tube test data roll chart so

the third line on which the 6SQ7 tube appears is between the

horizontal red lines. The FUNCTION switch, all SELECTORS

switches except the PLATE switch are set as in g above, and the

FILAMENT VOLTS meter indicates 6.3 volts.

(1) Set the PLATE switch to the 4 position.

(2) With the PLATE-SCREEN RANGE switch on S, ad-

just the PLATE fine control until the PLATE meter

indicates 20 volts ac.

(3) The quality SHUNT control remains on 90.

(4) The GM-SIGNAL RANGE switch remains on S.

(5) For the TV-2/U, aline the dot on the knob of the GM

CENTERING control with the dot on the panel. For

the TV-2A/U and TV-2B/U, aline the line marking on

the GM CENTERING control with the line marking on

the panel.

(6) Depress the PRESS TO TEST P2 switch and read the

PERCENT QUALITY meter. If the indication is less

than the minimum of 25, discard the tube. If the indica-

tion is satisfactory, the tube is good.