[Boatanchors] #44/47 Buld replacement with LEDs
k4oah at mindspring.com
Sat Feb 5 09:23:03 EST 2011
Yes, it really should.
I don't recall the numbers, but the bulb should be connected between Pins 4 and 6.
Seems like the resistor was 43 or 47 ohms, 2W.
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
Michael A. Bittner wrote:
> Thanks Gary, that clears up some questions. I'd always heard that
> damage could be done to an AA5 if a burned out pilot bulb were not
> Next question: Should a 35W4 always have a pilot bulb connected, as in
> an AA5, for proper operation. My Knight Ocean Hopper has a 35W4, but
> no pilot bulb.
> Mike, W6MAB
> ----- Original Message -----
> *From:* Garey Barrell <mailto:k4oah at mindspring.com>
> *To:* boatanchors at puck.nether.net
> <mailto:boatanchors at puck.nether.net>
> *Sent:* Friday, February 04, 2011 7:38 PM
> *Subject:* Re: [Boatanchors] #44/47 Buld replacement with LEDs
> The 'tap' on the filament is NOT a 'center tap'.
> The problem with this system is that of course the bulb is
> subjected to
> the initial surge of current when filaments are cold, causing that
> that you see at turn-on.
> Worse still is that when the bulb inevitably burns out, the excess
> current is forced through that portion of the filament in the
> causing it to fail open. LOTS of rectifier tubes killed when the
> noticed the bulb was out, but didn't want to take the radio to the
> for repair! Then he got to pay for a bulb AND a tube! :-)
> 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 <http://www.k4oah.com>>
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