[Milsurplus] puzzler - module with glass rod?

[antqradio at sbcglobal.net]

As far as I know, practical SAW devices date from the early 1960's.  The module looks to me to be from the late 1940's to perhaps the late 1950's.  No obvious inter digital transducers are seen on the surface of the glass cylinder.  Then there is the issue of only one connection to the rest of the module so there is only an input to Z1 and no output.  So I don't see Z1 as either a SAW device or as a delay line.
Since Z1's only port is connected to the flying coax lead and the closest vacuum tube is labeled V2, then that coax must be an output to some other module in the system.  There is a BNC female flange connector close to V1 so this must be the module input.  V1 and V2 are 6AK5's but I can't see any markings on the top that identify the other four vacuum tubes so it is difficult to figure out the rest of the circuit.  T4 seems to be a coaxial transformer so the frequency is still very high up to this section of the circuit.  There seems to be a flying lead that goes through the partition near the input BNC input connector.  What is happening on the other side of the partition is anyone's guess.Jim

      From: KD7JYK DM09 <kd7jyk at earthlink.net>
 To: Ian Wilson <ianmwilson73 at gmail.com> 
Cc: Military Surplus Mail List <milsurplus at mailman.qth.net>
 Sent: Monday, April 4, 2016 10:03 PM
 Subject: Re: [Milsurplus] puzzler - module with glass rod?
   
: Way too big to be a SAW device, methinks.

Yes, BUT...  Look how it's designed, how it's labeled and work back,
technology wise, a good chunk of a century...  Think of the first
transistors compared to the ones we have now that are measured in size
comparable to wavelengths of light.  Could be an old, inefficient and low 
frequency SAW filter.

Kurt

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