Heathkit AA-1214 Assembly And Operation Manual page 24

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Detail 3-3E
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HEATHKIT
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Refer to Pictorial 3-3 for the following
steps.
(~ Position the chassis on its right
end (power transformer side) to
perform the following steps.
Find the following parts. Use these
parts in the following steps.
(d )
Four TIP41B transistors(No 417-298).
(<"A Four transistor insulators(No 75-152).
6l)
Four fibre shoulder washers.
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Four 6-32 x 3/8 11 screws.
bi )
Four No 6 l ockwas hers .
· Four 6-32 nuts .
(d-l
One silicone grease cup(No 352-501).
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FIB ER
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SHOULDER WASHER
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( ) Refer to Detail 3-3A and insert the
leads of the four transistors into
the circuit board at A, B, C and D.
Do
not solder the leads to the foil.
NOTE: It is extremely important that
the transistors at A, B, C and D, when
mounted, be flat against the rear panel.
Failure to position these transistors
flat against the rear panel will cause
the transistor to overheat and be
destroyed at high power levels.
WRONG
TRA NS! STOR
! SIDE VIEW>
RIGHT
TRANSISTOR
! SIDE VIEW !
TRANSISTOR
BOD Y IS NOT
FLAT AGAI N ST
THE REi\ R PANEL
tail 3-3B
TRA NSI STOR
BODY I S FLAT
AGA INS T THE
REAR PANEL
(~ Refer to Detail 3-38 and push the
transistors at A, B, C and D, flat
against the rear panel.
NOTE: A nut starter has been supplied
to hold and start 4-40 and 6-32 nuts
on screws.
~
Refer again to Detail 3-3A and mount
each of the transistors at A, B, C
and D to the rear panel in the
following manner.
l. Apply approximately 1/8 of the
container of silicone grease to
both sides of an insulator.
2. Place the greased insulator between
the transistor and the rear panel.
Line up the holes in the transistor,
insulator, and rear panel.
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