Vector G08 Series Faq page 32

(Pretty bad drawing huh?)
The 0.39-ohm resistor allows the transistors to be hooked in parallel without one transistor going
into thermal runaway and trying to drive the whole load itself. (A good place to find out more
about hooking transistors in parallel is a Voltage Regulator handbook of some kind)
Heat Sink Modification
From anonymous:
"The deflection transistors mounted on the heat sink can be more efficiently cooled (and therefore
will last longer) if you place them on the inside of the heatsink instead of on the outside. To do this:
1) Remove the heat sink assembly from the monitor chassis by removing the screws on the
side of the chassis and disconnecting the fan and d eflection transistor harnesses from the
deflection board.
2) Remove two upper or lower screws from the fan so that the heat sink assembly can be
split in two.
3) Unscrew the deflection transistors from the heat sinks.
4) Place the transistor sockets on the outside of the heatsink, and then mount the transistors
on the inside of the heat sink. Make sure to reinstall the mica insulators with a thin layer
of silicon grease on both sides of the mica insulator.
5) Reassemble and remount the heatsink. Before hooking up the harness to the transistors
again, do a transistor test through the connectors (as mentioned previously in this
document) to make sure that they are mounted correctly, and that there are no shorts.
6) Reconnect the fan and deflection transistor harnesses to the deflection board and retest
the monitor.
The deflection transistors should now run much cooler."
One of the main problems with the fan-cooling setup is that the airflow through the closed cabinet
is pretty miserable. You may want to consider running your Sega XY cabinet with the back access
door removed.
HV Unit Modification
For capacitors, see "Installing a Cap Kit" section of this document.
Neck Board Modification
None available as of this version of the document.
G08 Vector Monitor Guide
Page 32 of 41