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

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Subject: [AMPS] Filament Choke Question (RE: Handbook example)
From: (Jon Ogden)
Date: Sat, 20 Feb 1999 11:04:46 -0600
Was looking at my 89 handbook at some of the amplifier designs to look at 
what folks were using for filament chokes.  Starting on page 30-50, there 
is a design for an 8877 amp.  In looking at the schematic, the guy uses 
NO filament choke.  The two filament lines are both bypasssed to ground 
by .01 uF caps.  From what I can tell the filaments are on pins 1 & 5 of 
the tube and the schematic says that pins 2,3,4,6, & 7 are the cathode 
input.  Yes, it's grounded grid.

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.

Just curious.



Jon Ogden
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