Hello Bob: I replaced the lamps in my 238 with LEDs from Radio Shack. The
have bright blue/white LED in stock.The LEDs typically light with 1.3 volts at
20 ma. I used something around 1.5k and soldered the resistor to the
centercontact of the old lamp. the LED is soldered to the brass and the free
end of the resistor. The scale for the inductorin not bright at all but you
can see the pointer. The meter is really bright.
Clayton N4EV
From: Bob Good <k4bg@planters.net>
To: TenTec@contesting.com
Sent: Wednesday, December 17, 2014 8:56 PM
Subject: [TenTec] Replacement lighting for T-T 238 Inductor Dial
Can someone suggest a bright replacement incandescent or LED for my 238
coupler? It has been dim since they designed it. I guess they didn’t figure
on me getting old and still using it. If you suggest LED, please tell me about
the necessary resistors or whatever. The “S” meter is okay but wouldn’t mind
replacing it as well. I think I could devise a way to anchor them to the bulb
socket mounts. Thank you for the reading and help. Seasons Greetings to
all....Regards, Bob K4BG
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