©1992 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Manual revised: 05/03/04 2:51:00 PM- Page 5 -
especially in linear operation.
When replacing a transistor,
remove any parts that are on top of
the leads, and then carefully peel each
lead away from the pc board while
melting the solder. Then remove the
mounting hardware and gently push
the old transistor out of the heatsink.
Clean all the old solder off the pc
board to avoid stressing the leads
when the new transistor is mounted.
Add new heatsink compound, and
install new transistor with collector
lead (has notch) oriented properly.
Tighten mounting hardware carefully;
avoid over-torquing the brass stud of
Q2. Then, flatten leads against the
board, and sweat solder them to the
foil. Remember to resolder any parts
removed for access to the transistor
leads.
PARTS LIST.
Ref Desig Description (marking)
C1-C10 n/a
C11-C12 1-20 pF ceramic variable
cap. (pink)
C13
20 pF disc ceramic
C14 n/a
C15
250 pF metal-cased mica
C16 n/a
C17
250 pF metal-cased mica
C18 compression
mica
cap. #703
C19
1-11 pF piston trimmer
C20
.01 uF disc cap (103)
C21
250 pF metal-cased mica
C22
47 uF electrolytic
C23 n/a
C24
250 pF metal-cased mica
C25 n/a
C26
250 pF metal-cased mica
C27-C28 33 pF metal-cased mica
C29-C30 24 pF metal-cased mica
C31
1-11 pF piston trimmer
C32
250 pF metal-cased mica
C33
0.15 uF polyester (red)
C34
250 pF metal-cased mica
C35 n/a
C36
.01 uF disc cap (103)
C37
250 pF metal-cased mica
C38
47 uF electrolytic
CR1 n/a
CR2-CR3 1N4003 silicon diode
L1-L2 n/a
L3-L5
Air wound coils, see text
Q1 n/a
Q2
Motorola MRF653 or
Thomson SD-1433 or
SD-1136
Q3
Philips BLU45/12 or
Thomson SD-1434
R1-R4 n/a
R5 10
Ω
, 1/4W
R6
Combination of several
resistors, see text for
bias adjustment
R7 3.3
Ω
, 1/4W
R8
Combination of several
resistors, see text for
bias adjustment
R9 3.3
Ω
, 1/4W
Z1 n/a
Z2
Ferrite bead on lead of R7
Z3
Ferrite bead on bus wire
Z4-Z7
6-hole ferrite core with
2-1/2 T #22 bus wire
