[Test-Equipment] Lafayette VTVM

[hwhall at compuserve.com]

Check out this description of a KT-174:

https://archive.org/stream/am-1962/Audio-1962-dec#page/n47/mode/2up

 
Of interest is that it describes now a 6BN8 is used as a dual diode single triode for AC voltages but note that a 6BL8 is a triode + pentode tube and probably not right.

Wayne

 WB4OGM

 

-----Original Message-----
From: Ron Bussiere via Test-Equipment <test-equipment at mailman.qth.net>
To: lafayetteradiocollectorsclub <lafayetteradiocollectorsclub at yahoogroups.com>; lafayette <lafayette at mailman.qth.net>; test-equipment <test-equipment at mailman.qth.net>
Sent: Tue, Nov 4, 2014 3:50 pm
Subject: [Test-Equipment] Lafayette VTVM


Hi. I just purchased a Lafayette VTVM model 174. This is a pretty unusual VTVM. 
It is unclear if it was a kit or not.......
It is in mint condition but not quite working correctly. Although the case 
states just Model 174, it may indeed be a KT-174.
I have had this dilemma before. I purchased a KT-208, which is a signal 
generator/tracer, which may or not have been factory wired. 
The KT-208 is identical to the Accurate Instruments 154.

The VTVM is 'unusual' in that it uses a 12AX7 (which is marked on the PC board), 
and a 6BL8 alongside. The 6BL8 nomenclature is NOT marked on the board, so, I'm 
not even sure if it's the correct tube.The usual other VTVM tube is a 6AL5, 
right?

Yep, I collect VTVMs AND Lafayettes. Don't know why, I just do.
(also started collecting vintage metal detectors, sigh)

Any ideas???

ron

N4UE
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