Gary,
As you say, it is a system, which is after the heat of specific areas
within the TR7. Same holds true of the PS7. I hear people say the fan
does nothing for the pass transistors. The Drake engineers explained to
me that they were not so much after the transistors, but rather the filter
capacitors. When I heard that I had one of those duh moments. You can
tend to forget that the caps under heavy load generate heat. They provide
~25 Amp of current during the troughs of the 120Hz ripple, then recharge
during the peaks. A whole lot of "flexing" going on inside those filter
caps.
73,
Ron WD8SBB
On Sun, 3 Aug 2008, Garey Barrell wrote:
Jim -
Once again, the Drake engineers actually knew what they were doing. Amazing!
As always, getting the hot air _OUT_ and away from the area is more
important than blowing it around INSIDE the radio.
Any cooling _system_ is just that.
Good job!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
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