AVERAGE VOLTAGES *

SERVICE NOTES
HUM MODULATION:
On Early Production runs Condenser C-18 consisted of two. 05 mfd. units. One ground terminal was connected to CHASSIS, the other to B. Disconnect the CHASSIS terminal of the. 06 Con denser now connected to Pin No. 1 of the NU - 198A7GT tube and connect this lead to Pin No. 5 of either of the NU - 128KIGTs or to any other convenient B - point. This effectively by-passes the A.C.
Modulation hum to B instead of to Chassis.
OSCILLATION:
Remove one side of Resistor R-8 (in grid circuit of 13SATGT) now connected to A.V.C. bus and reconnect to cathodo (# 5 pin) of I.F. 12SK / GT.

TUNING Broadcast Band 535 K.C. to 1620 K.C. 2 Gang Variable Capacitor
POWER 105-125 Volts, 60 cycles A.C. 105-125 Volts, Direct Current
SUPPLY Approx. 30 Watts Consumption

* Because of the many variables that may enter into voltage measurements it is impractical to indicate ABSOLUTE values of voltage. Readings must necessarily be AVERAGE voltages and even these are subject to a + in % variation, D.c.
measurements shown are at 20,000A / volt. A.C. measurements shown are at 1,0000 / volt. Readings are taken from SOCKET PINS TO COMMON NEGATIVE while viewing sucket from the BOT. TOM. Volume Control set at MINIMUM Tuning Condenser set at Full Mesh (Maximum Capacity)

ALIGNMENT PROCEDURE
PRELIMINARY.
(a) Adjust the DIAL POINTER along the dial cord to the position opposite the first right-hand punch m.7rk on the dial backing-plate, with the tuning condenser gang completely out of mesh (Minimum Capacity); (b) Set VOLUME CONTROL to the FULL ON position; (c) Maintain SIGNAL GENERATOR output at MINIMUM consistent with a readable Output Meter indication; (d) OUTPUT METER across voice coil; (e) Follow sequence indicated below.