Re: [Drakelist] Light bulbs

[Garey Barrell]

Jeff -

The Meter illumination bulbs are actually 5V, #1850. The #47 would work 
there I suppose, but I don't see how the #47 would work for the 
indicator lamps. They are powered from the 28V AC winding on the 
filament transformer via a 150 ohm 1W resistor (R27). At 150 mA, they 
would be leaving over 3W in the 150 ohm resistor.? I don't have an L-7, 
but it uses the same transformer and relay as the L-4B, which has a 
30VDC supply.

Evan is the L-7 expert, perhaps he will see this and comment.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>



jeff austin wrote:
Good day
The bulbs in the L7 are 6.3v 150ma, available from radio shack, part nr
272-1110a item nr 47, rgds
Jeff/9y4ja

--- On *Thu, 9/18/08, Evert Bakker (PA2KW) /<[EMAIL PROTECTED]>/* wrote:

    From: Evert Bakker (PA2KW) <[EMAIL PROTECTED]>
    Subject: [Drakelist] Light bulbs
    To: drakelist@zerobeat.net
    Date: Thursday, September 18, 2008, 2:37 PM

    Is there anyone out there who knows what voltage the indicator
    light are of the L7?

    It’s not mentioned in the drawings and I’ve dismantled my L7 for
    total revision.

    Thanks in advance.

    73’s, Evert PA2KW

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