Last Capacitors And The Transistors; Winding The Output Inductor - DYNACO STEREO 120 Updating Instructions

Last Capacitors and the Transistors

Now, the medium tall polarized electrolytic capacitors:
C1 and C6 are polarized. Make sure the negative sign on the capacitors faces
away from the positive sign on the silk screen!
Designation Value
C1 47 F, 63 V
C6 47 F, 100 V
And the non-polarized capacitors:
Designation Value
C2 1 F, 63 V or
100V
C5 0.1 F, 100V
C8 0.1 F, 100V
C10 0.1 F, 100V
Install the transistors. Spread the outside leads a bit to make it easier to insert them into
the board.
Orient the transistor so its body shape matches the silk-screen outline. Leave the
top of the transistor about ½" off the board! The lead length prevents stress on the
body and keeps the transistor safe from too much heat during the soldering
operation.
Designation Value
Q1 2N5551, NPN
Q2 2N5551, NPN
Q3 2N5551, NPN
Now install the speaker coupling capacitor:
Watch the polarity! Make sure the minus sign faces away from the plus sign on the
silk screen. That puts the minus side of the cap along the outer edge of the circuit
board.
Designation Value
C11 3300 uF 63V
The speaker coupling capacitor will either snap or push into place. Verify once more that
you have polarity correct, and then solder both speaker terminals to the circuit board.
This will probably take more heat, time, and solder than anything you have soldered up to
now.

Winding the Output Inductor

This step takes just a bit of finesse, but if you've come this far, you have nothing to worry
about. If you're a bit frazzled, take a break before proceeding.
Marking
47 F, 63 V, and minus sign for polarity
47 F, 100 V, and minus sign for polarity
Marking
1 uF, 63 V or 100V (box shaped mylar
capacitor)
104
104
104
Marking
2N5551
2N5551
2N5551
Marking
3300 uF, 63 WVDC
Page 18 of 32
Done?
Done?
Done?
Done?