[Test-Equipment] Board identification

[Glenn Little WB4UIV]

I have two boards that are the same size 6.5" long x 2.875 with 15 
pins per side of the plug. One is marked C5080-2733. This board has 2 
1854-0003 and 2 2N526 transistors, indicating this is a HP board. 
This board is possibly an audio oscillator. The other board is marked 
B2365-3204. This board has 2 2N526 transistors and is possibly a 
filter. Does anyone recognize these and know what instrument these 
would be from?

Thank you
73
Glenn
WB4UIV