[Amps] cooling chimney?

[Russ Williams]

Carl, can you elaborate on the problems using Coleman chimneys?  I plan on using them for a 4-400a project and also know of 2 other hams using them in conjunction with GS-35b's.  It seems the Pyrex/borosilicate glass would be ideal for this application.  If there have been confirmed disasters using them, other avenues may need to be pursued.

I suppose a test in the microwave oven would illuminate any faults in the Coleman's glass formula...

Thanks.

Russ W6OHM