Steve -
Extremely high gain tubes mean extremely closely spaced grids! :-)
--
73, Garey - K4OAH
St Charles, IL
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Steve Wedge wrote:
If you can find a tube tester, test it. I find that 6HS6's get shorts more than most other
tubes. They won't show up until you light the filament. My TV-10-D/U puts line voltage on the
pins to check for shorts (to light a neon bulb), so you wouldn't necessarily see a short with no
power to it. Not sure why I see so many: if it's something in the design or just because many
people when they find these tubes are on the way out try to milk them for as long as they can
because they're so expensive.
From: <[email protected]>
Sent: Wednesday, December 21, 2011 8:54 PM
To: <[email protected]>
Cc: <[email protected]>
Subject: Re: [Drakelist] AC-4R Surprise
Well, my nose detected burnt smell in vicinity of T4. R61, a 150ohm 1/2 resistor in the 250 volt
line to V8's plate is burnt to a crisp, resistance is zero. But why? Resistance to ground on V8
pin 5 is 15k per spec. But pin 6 screen grid resistance to ground it 15k, vs 90k spec.
Any advice? 73, Curt KB5JO
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