[GreenKeys] Museum

[Roy Morgan]

At 04:03 PM 5/9/2005, Jack wrote:
>Check out this museum! This is an amazing collection.
>
>www.johnlarue.net

Jack,

Thanks for that link..  (Copy to their addresses.)

Seeing all that stuff reminded me that today I brought with me the BSP for 
a line test set I got recently - the 13A Transmission Measuring Set.

This thing measures sound level in a 600 ohm line from -45 dbm to +10 dbm. 
It has a tube amplifier and such in side. The home made case I got included 
a copy of the original BSP!  happy happy

The BSP is dated 1944.  The thing runs on 115 volts ac or dc, and has a 
series filament string with common tubes 6J7, 25L6 and 25Z6 (with a series 
dropping resistor.)  It is supposed to be in a case that I don't have, but 
it's now in a home brewed plywood case that gives modest protection against 
shock and such.  It has electrolytic condensers in it, so I'll pay close 
attention to those as I bring it back to life.

I have a more recent version of that test set, the type 3A, a 
transistorized one that runs on a battery.

It will be interesting to compare the two.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --