[AMPS] Filament Choke Question (RE: Handbook example)

[Rich Measures]

>
>In a message dated 2/20/99 12:04:03 PM Eastern Standard Time,
>jono@enteract.com writes:
>
><< 
> Is the 8877 set up this way so that the filament pins are isolated from 
> the cathode?  Is that why he's able to get away with it?  I'm ignorant of 
> how the 8877 is set up.
>  >>
>
>Yep,
>that is the beauty of 8877, cathode is separate from filaments, no need for
>choke, just have to wait for them glowers to heat up, abt 3 min.
>
>Note on some chatter about parasitics, impedances, etc. One way to get around
>it is to use monoband design. 

€  The resonant circuit that supports intermittent vhf parasites is 
principally formed by the C-out of the tube, and the total inductance of 
the leads between the anode and C-tune.  The tank inductance and 
bandswitch do not influence the problematic vhf resonance.  



Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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