From lafayette at mailman.qth.net  Tue Nov  4 17:50:34 2014
From: lafayette at mailman.qth.net (Ron via Lafayette)
Date: Tue, 4 Nov 2014 17:50:34 -0500
Subject: [Lafayette] Lafayette VTVM
Message-ID: <8D1C698E0889CB6-12E0-42764@webmail-vm153.sysops.aol.com>

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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From manualman at juno.com  Tue Nov  4 19:02:49 2014
From: manualman at juno.com (manualman at juno.com)
Date: Tue, 4 Nov 2014 19:02:49 -0500
Subject: [Lafayette] Lafayette VTVM
Message-ID: <AABLFU4MFAEBJ84A@smtpout01.vgs.untd.com>

It was also known as the KT-174 in kit form and the TE-31 (wired and
tested). It used 6BN8 and 12AU7 tubes. I believe it was also made by
Accurate Instrument. In the Lafayette world, if the model number started
with "KT", that was a kit version.

Pete

On Tue, 4 Nov 2014 17:50:34 -0500 Ron via Lafayette
<lafayette at mailman.qth.net> writes:
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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From lafayette at mailman.qth.net  Thu Nov  6 00:03:19 2014
From: lafayette at mailman.qth.net (Ron via Lafayette)
Date: Thu, 6 Nov 2014 00:03:19 -0500
Subject: [Lafayette] My Lafayette 174
Message-ID: <8D1C7961D993B7E-E14-F7E7@webmail-va084.sysops.aol.com>

Sorry about my errors asking for help with my Lafayette Model 174 VTVM. Several generous folks have helped me with the research into this unusual model.
As several folks have stated (and my visual observations have confirmed,) it indeed was a kit.
I mistakenly stated the wrong tube #s,
It uses a 12AU7 and a 6BN8. Sorry for my mistake. I must have been tired that night.
Believe it or not, I have purchased the Manuals on good 'ole eBay for the schematics.
I doubt this old meter was ever put into service, do to soldering errors and broken parts.
I just wanted to say a BIG thank you for all the GREAT folks that helped me in my quest to prevent this pristine piece of Test Equipment from being put into the scrap pile!

ron
N4UE
(ham since 1962)

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From lafayette at mailman.qth.net  Sat Nov  8 14:10:32 2014
From: lafayette at mailman.qth.net (Ron via Lafayette)
Date: Sat, 8 Nov 2014 14:10:32 -0500
Subject: [Lafayette] Lafayette 174 VTVM
Message-ID: <8D1C99ECD44E947-E74-1033B@webmail-vm161.sysops.aol.com>

Just wanted to say "THANK YOU" for all the help I received regarding my latest Lafayette.
Leads led me to an older copy of a Sams publication on ePay that had a great description of the VTVM and a schematic.
Although I paid more for the VTVM / VOM book than I did for the meter, I'm happy.

Evidently, this meter was available in both kit and factory wired forms. I still haven't been able to determine which version mine is, at least now, I 'should' be able to fix it. ha ha

I'm just amazed that the amount of test equipment (and other electronic stuff) for sale, that is missing the manuals.
This is evidence that CERN doesn't have to worry about creating a black hole here on earth, because there must already be one here that has swallowed all these old manuals!

ron
N4UE
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