[Boatanchors] #44/47 Buld replacement with LEDs
k4oah at mindspring.com
Sat Feb 5 09:26:14 EST 2011
The 35Z5 is another with the tapped filament that should either have a
bulb or a 43 ohm, 2W resistor connected between Pins 2 and 3
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
> The 35W4 is a bit of a strange bird. The filament is tapped but rather
> being tapped at the center like the venerable 12AU7 and similar valves the
> 35W4 is offset so that there are different drops across each filament
> From Pin 3-4 with a #47 Lamp the filament drop is 32 Volts. From Pin 4 - 6
> the nominal drop is 5.5 volts.
> For more info see the datasheet at the follwoing URL:
> Feb 4, 2011 10:18:40 PM, infomet at embarqmail.com wrote:
> Aren't these 6V lamps? How could you connect one across 17.5V of
> ----- Original Message -----
> From: "Walter - K5EST"
> To: "BoatAnchors"
> Sent: Friday, February 04, 2011 8:19 PM
> Subject: Re: [Boatanchors] #44/47 Buld replacement with LEDs
> > Great question......thanks, Mike!
> > 73....Walter - K5EST - Missouri
> > On Thu, Feb 3, 2011 at 7:39 PM, Michael A. Bittner wrote:
> >> How would these work in an AA5 radio where the #47 bulb is often
> >> connected
> >> across one half of the rectifier heater? Rectifiers are
> typically 35Z5 or
> >> 35W4 with center-tapped heater. Mike W6MAB
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