[Amps] Alpha chimneys

[Jim Barber]

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!
>