[Boatanchors] #44/47 Buld replacement with LEDs

[Garey Barrell]

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
<www.k4oah.com>


Chuck wrote:
> The 35W4 is a bit of a strange bird. The filament is tapped but rather 
> than
> 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 
> section.
> 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:
> http://www.r-type.org/pdfs/35w4.pdf
> 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
>     filament??
>     Wilson
>     W4BOH
>     ----- 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
>     >
>     >
>