INSTRUCTIONS FOR RECTIFIER TUBE REPLACEMENT
These instructions apply to any Hewlett-Packard instrument in which a
5V4 tube is mounted in the power rectifier tube socket, When it is necessary to
replace the rectifier tube, a 5Y3GT tube may be used as a replacement if the
following instructions are followed.
INSTRUMENTS WITH DC VOLTAGE REGULATOR CIRCUIT -
The 5V4 tube may be replaced by a 5Y3GT tube without any circuit changes.
After the 5Y3GT tube has been installed, the regulated voltage should be meas-
ured to see if it agrees with the voltage shown on the schematic wiring diagram
in the instruction book. If the regulated voltage is incorrect it. may be corrected
by following the instructions in the instruction book.
INSTRUMENTS WITHOUT DC VOLTAGE REGULATOR CIRCUIT-
The 5V4 tube may be replaced by a 5Y3GT tube providing the resistor, in
series with the DC output of the rectifier, is removed, This resistor does not
appear in the schematic wiring diagram in the instruction book, The following
instruments use a 500 ohms series resistor: Models 200C, 200D, 202D, 210A,
300BCD, and the 400A. |