Re: L4B Chimney size (K7CBR, VE7RF, WB6KBL)
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Yes this looks spot on! Thanks Jim... I also attached another view with the old suppressors installed with the factory straight wall chimney's.
the tapered version is what Eimac recommends, along with grids grounded at the chassis. I am not being critical about anything Drake did. Just showing what my own iteration for the L4B is. I am 100% happy with it, and after all the work, never has suggested excess heating is an issue. I use no auxiliary fans or blowers with it at all as it flat does not need it. I used a bias scheme similar to Jim's also giving 100ma of grid current at idle.
On Tuesday, December 24, 2024 at 11:46:05 AM EST, Jim VE7RF via groups.io <jim.thom@...> wrote:
It's an EBM-Papst blower... model # is? G2S097- DB61-08? (115 vac version).?
The 230 vac version is? #? G2S097- DB03 - 01?
They both weigh 1.81 lbs, and both are galvanized.?
26 cfm @ 0"? ?and 20 cfm @ .4"?
37 dba
Ball bearings.? ( field replaceable)??
22 watts.?
Eimac 3-500Z cooling specs ( using tapered chimneys and a? PAIR of tubes)? is 20.6 cfm @ .052"? ? for 400w? CCS diss.? ? And? ?26.0? cfm @ .082"?
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