ae.2. IF Printed Circuit Board 85-128-x
There are five (or possibly four) different revision levels of this board. Some differences
are (to be sorted out ...):
Revision Level P376 (SB-100)
R104 and R105 are 56
R106 is 22k
R110 is 330
Meter zero pot is 200
Revision Level 2 (SB-101, SB-102)
R104 and R105 are 56
R106 is 22k
R110 is 330
Meter zero pot is 200
Revision Level 4 (HW-101)
R104 and R105 are 47
R106 is 22k
R115 is 220
R110 is unused
Meter zero pot is 10K
Revision Level 5 (SB-102)
R104 and R105 are 56
R106 is 33k (this reduces the screen voltage on V3) – note: this change in value is recommended for all
models.
R110 is 510 (compensates for the change in R106 to permit zeroing the “S” Meter)
Meter zero pot is 200
Printed Circuit Boards (PCBs) Page 110