1955 - 1959 Chevrolet Radio Service

3.	Check or replace power transformer, item 55 on circuit diagram and
	parts layout.
4.	Check or replace resistor, item 44 on circuit item 56 on circuit diagram
	and parts layout.
5.	Check or replace vibrator, diagram and parts layout.

Next check the tube pin marked "S" on I2V6GT tube, which should read 210 to 220 volts "D.C.". If incorrect or no voltage, check or replace the following:

1.	Check or replace electrolytic condenser, item 18B on circuit diagram
	and 18 on parts layout.

PARTS LAYOUT - TOP VIEW - 987187 - RADIO
fig. 5

Next set volt-ohm meter in the "300" volt position to read "D.C." voltages. Check tube pin marked "K" on 0Z4 tube, which should read 245 to 255 volts "D.C.". If incorrect or no voltage, check or replace the following:

1.	Check or replace 0Z4 tube.
2.	Check or replace 0Z4 tube socket.

Next check the tube pin marked "P" on l2V6GT tube, which should read 230 to 240 volts "D.C.". If incorrect or no voltage, check or replace the following:

1.	Check or replace electrolytic condenser, item 18A on circuit diagram
	and 18 parts layout.
2.	Check or replace audio transformer, item 54 on circuit diagram and
	parts layout.
3.	Check or replace condenser, item 21 on circuit diagram and parts
	layout.

2.	Check or replace resistor, item 45 on circuit diagram and parts
	layout.

Next check the tube pin marked "K" on I2V6GT tube, which should read 10 to 15 volts "D.C.". If incorrect or no voltage, check or replace the fol lowing:

1.	Check or replace resistor, item 43 on circuit diagram and parts layout.
2.	Check or replace condenser, item 21 on circuit diagram and parts
	layout.

Next check tube pin marked "P" on 12AV6 tube, which should read 85 to 95 volts "D.C.". If in correct or no voltage, check or replace the following:

1.	Check or replace condenser, item 17 on circuit diagram and parts
	layout.
2.	Check or replace resistor, item 40 on circuit diagram and parts layout.