Phase Linear 400 - Technical Description; Power Amplifier Circuitry; LED Display System

SECTION VI
400 BOARD HISTORY
R5 47K
R9 1.5 Meg
R10 22K
R14 Trim pot---lk older amps and 250 Ohm in newer amps.
R15 ІК before December 1972---820 Ohm since.
R13 2.2К to 3.9K resistor.value changes as needed.
R37 120hm-1 watt
R38 120hm--1 watt
ОЗ 5172 or 2N3403--Heat sink mounted.
Q9 013 Output driver--SJ2741, MJ1800, RCA410.
Output device--PL909, PL909A, XPL909.
METERS
PHASE LINEAR NOW USES JEWELL METERS. ІМ THE PAST, THE 400 UNIT
USED ARGONNE METERS AND THESE ARE NOT INTERCHANGEABLE WITH THE
JEWELL. THE TECHNIQUES USED TO LIGHT THE METERS HAVE BEEN
CHANGED TO IMPROVE THE LIGHTING. IF YOU WISH TO REPLACE A METER,
RETURN THE OLD METER TO THE FACTORY AND A NEW METER WILL BE SENT
BY AIR THE SAME DAY.
NOTES
PHASE LINEAR CORPORATION
If you should have any questions, please contact: Service Manager
P.0. Box 549, 405 Howell Way
10 Edmonds, WA 98020 (206) 774-3571