Vectronics VEC-1500K - Manual (Page 60)

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Install a .1-uF monolithic capacitor at location C4. Solder.
Locate the 1N4148 silicon diode. Note this is a polarized device. The cathode
band must be installed as indicated by the parts placement diagram.
Cathode
1N4148
Form the leads of the 1N4148 to a .4” span. Be careful not to stress
the glass body, it may crack and fail. Install the 1N4148 diode at
location D1 observing polarity. Solder.
Locate the ten 2N3904 plastic transistors. These transistors will be installed at
locations Q1 through Q10 on the PC board.
Important Note: The 2N3904 transistor body has a flat and rounded side. The
device body outline must correspond to the parts placement outline in reference
to the PC board.
2N3904
All the transistors should be mounted with their bodies at the same elevation
above the PC board.
Install a 2N3904 transistor at location Q1. Solder.
Install a 2N3904 transistor at location Q2. Solder.
Install a 2N3904 transistor at location Q3. Solder.
Install a 2N3904 transistor at location Q4. Solder.
Install a 2N3904 transistor at location Q5. Solder.