It varies.
With the Alpha 76A and variants, the chimneys just butt up against the
perforated metal in the top of the case.
With the 77* series, they're wrapped conically, (instead of a straight
tube) and the smaller end is clamped to an exhaust pipe.
I like the system. It makes changing out tubes a little more interesting
if the chassis is tight, but keeps the exhaust air controlled.
In my last 8877 I slit the rubber up the side, (for the anode connection
strip) then made a little larger drill hole at the end of the slit to
prevent it from tearing out. After some juggling and clamping the rubber
to the anode cooler with a stainless hose clamp, everyone was happy.
My .02,
Jim N7CXI
On 11/8/2013 3:02 PM, Vic K2VCO wrote:
Can someone tell me how Alpha and others that use silicone rubber chimneys
on the tubes deal with the tops of the chimneys? Do they just butt up
against a perforated section of the top cover, do they exhaust into the
cabinet, or what? I've looked at many amplifiers with the covers off, but
I've never noticed!
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