[Amps] Please help ID this ETO PA chassis

[Keith Morehouse]

AMPS-listers:

I needed a quicky chassis to prototype a new PA and recently purchased this on 
EBay:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rt=nc&nma=true&item=120691460254&si=Zi9jCTjwufxwdIxjeQ30O0sC%252BAM%253D&viewitem=&sspagename=STRK%3AMEWAX%3AIT



What I received is a date-code 1991 ETO PA+IPA chassis, originally using a 
3CPX800A (under chassis mount) driving a YC-156 (the custom spec 3CPX5000A7 
socket-less tube).  I assume this was either a prototype (or short production 
run) MRI 1.5T or 3.0T amplifier.  Looking at the PA compartments matching 
components, it's obviously a mid-VHF network, probably somewhere right above 
6M.  I'm not recently schooled in MRI engineering, but I believe there were (are 

?) units that operated around 60 MHz.  Since my proto is for 50 MHz, I'd like to 

try and use as much of the existing system as I can.

Referring to the EBay pictures, can anybody ID the original operating freq of 
this chassis ?  Does anybody (John, W0UN ?) have any design info on it ?  It has 

several ETO P/N's, including several in the series of MSX-X9**.  The date code 
is May 1991.

Whatever it turns out to be, it looks like it'll cut a lot of time off my design 

since I won't have to cut much metal and it has a real nice blower + nice usable 

"stuff" included.

TIA

Jay W9RM

Keith J. Morehouse
RF Specialists Inc
PO Box 849
Hampshire IL 60140