[Drake] Sub For #47:

[Garey Barrell]

Edmund H. Ramm wrote:
> Paul Christensen writes:
>
>   
>> Or...eliminate the incandescent lamp altogether and replace it with a Blue 
>> LED mounted in a #47 base
>> [...]
>>     
>
>    Eek! Introducing semiconductors to a wonderful 100% valved -and thereby
> EMP-proof- receiver? Buerklin's 33G202 7v/100mA with BA9S socket is my
> favourite #47 replacement.
>
>    73, Eddi ._._.
>   

Uhhh, Every R-4/A/B/C & T-4X/B/C has already been "introduced" to 
semiconductors..........  :-)

That aside, the 755 IS a great replacement for the 47.  It has an 
expected lifetime of almost seven times that of the 47, and the slightly 
lower light output is hard to spot unless you have a 47 in one unit and 
a 755 in another sitting next to it.  The 755 also reduces the fading of 
the original blue-green filter, and more importantly the yellowing of 
the diffuser.  It's the yellowing of the diffuser that imparts that 
greenish hue rather than fading of the "blue".

Now all we need is for Don, N9OO to put blue AND green LEDs into his 
replacement units to more closely match the "real" Drake dial color!!!!!

By the way, I have been using 755 bulbs in MANY Drake units for over 20 
years, and have yet to replace one.

73, Garey - K4OAH
Atlanta

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