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<DIV><FONT size=2 face=Arial>Chuck, Thanks for the info and data sheet on the
35W4. Looks like it's OK to use the 35W4 in a series string without
harm as in my Knight Ocean Hopper and according to the alternate diagram on the
data sheet.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>This still leaves us with the question of how one
of these #47 bulb LED substitutes would work in an AA5 radio. After all,
the D in LED stands for diode. W6MAB</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=wcmoore@verizon.net href="mailto:wcmoore@verizon.net">Chuck</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=infomet@embarqmail.com
href="mailto:infomet@embarqmail.com">infomet@embarqmail.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=boatanchors@puck.nether.net
href="mailto:boatanchors@puck.nether.net">boatanchors@puck.nether.net</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 04, 2011 9:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Boatanchors] #44/47 Buld
replacement with LEDs</DIV>
<DIV><BR></DIV>
<DIV>The 35W4 is a bit of a strange bird. The filament is tapped but rather
than</DIV>
<DIV>being tapped at the center like the venerable 12AU7 and similar valves
the</DIV>
<DIV>35W4 is offset so that there are different drops across each filament
section.</DIV>
<DIV> </DIV>
<DIV>From Pin 3-4 with a #47 Lamp the filament drop is 32 Volts. From Pin 4 -
6</DIV>
<DIV>the nominal drop is 5.5 volts.</DIV>
<DIV> </DIV>
<DIV>For more info see the datasheet at the follwoing URL:</DIV>
<DIV> </DIV>
<DIV><A
href="http://www.r-type.org/pdfs/35w4.pdf">http://www.r-type.org/pdfs/35w4.pdf</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>> Great question......thanks, Mike!<BR>> 73....Walter - K5EST -
Missouri<BR>><BR>><BR>> On Thu, Feb 3, 2011 at 7:39 PM, Michael A.
Bittner <MMAB@COX.NET>wrote:<BR>>> How would these work in an AA5 radio
where the #47 bulb is often <BR>>> connected<BR>>> across one half
of the rectifier heater? Rectifiers are typically 35Z5 or<BR>>> 35W4
with center-tapped heater. Mike W6MAB<BR>><BR>>
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list<BR>> Boatanchors@puck.nether.net<BR>>
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