As suggested by Garey, I replaced both the two #47 bulbs with the much
more durable #755. Light is back in my T-4XB!
73
Franco IZ2OOS
2010/4/25 Garey Barrell :
> Franco -
>
> The two bulbs are in series across the 12V filament supply, so if either
> opens up, they both go out! So one just burned out!
>
> The originals are indeed #47 bulbs, and are available from just about any of
> the usual electronic parts supplier. They are/were the "standard" bulb in
> just about every piece of electronic equipment that had bulbs! :-) If you
> can find them, I would suggest that you replace both bulbs with #755 types.
> The #47 is a "3000 hour life" bulb, while the #755 is a "20,000 hour life"
> bulb, meaning that you most likely will never have to replace them again.
>
> 73, Garey - K4OAH
> Glen Allen, VA
>
> Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
>
>
>
> iz oos wrote:
>>
>> Hi folks,
>>
>> both the bulbs at the plate amps rel. output and at the dial stopped
>> working as I turned up the T-4XB. I turned it on after about 1 minute
>> I had turned it off and then the lamps stopped working, I don't know
>> if this could be related to the burning of the lamp, but it happened.
>> Where could I find the right replacement for these bulbs? Looking at
>> the schematic they look like to be ## 47 ## 47 (I am not sure about
>> that) am I correct? What could have been the cause?
>>
>> My T-4XB is so dark now
>>
>> 73,
>>
>> Franco IZ2OOS
>>
>>
>
> ___
> Drakelist mailing list
> Drakelist@zerobeat.net
> http://mailman.zerobeat.net/mailman/listinfo/drakelist
>
___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
