[Boatanchors] [Test-Equipment] TV-2

[Carl]

The calibration tube came out of the audiophool world as a way to dig into 
the wallets.

About 2 years ago several of us in the US and Canada with Hickok 752A's 
shipped 2 widely different power level tubes around to check and compare 
calibration. The results were surprisingly close and many were in extremely 
close agreement. The tubes were a NOS 6L6 and I believe a 6J5.

Most of us also used them to check accuracy of other testers. I also have a 
I-177, TV-7C/U and Jackson 648S that I had overhauled according to military 
manuals and Internet data. I have 4-5 other military and civilian Hickok 
design testers that are awaiting their turn.

Carl
KM1H


----- Original Message ----- 
From: "Eric Lemmon" <wb6fly at verizon.net>
To: "'Discussion of Electronic Test Equipment'" 
<test-equipment at mailman.qth.net>; "'Pete Lancashire'" 
<pete at petelancashire.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Thursday, July 15, 2010 8:45 PM
Subject: Re: [Test-Equipment] [Boatanchors] TV-2


>I have a TV-7A/U tube tester, along with all of the military manuals for 
>it.
> As you may know, the TV-7 is a later version of the TV-2.  I just looked 
> in
> TM 11-6625-274-35, the Field and Depot Maintenance Manual for the TV-7
> testers, and found nothing about a "calibration tube" in the calibration
> procedure.  Indeed, the depot calibration requires nothing more than a
> Variac and a sensitive multimeter.
>
> Obtain a copy of TM 11-6625-316-35, the Field and Depot Maintenance Manual
> for TV-2/U, TV-2A/U, TV-2B/U. and TV-2C/U.  Many such manuals are still
> available for download from the Army LOGSA site.
>
> 73, Eric Lemmon WB6FLY
>
>
> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net
> [mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of Steve Byan
> Sent: Thursday, July 15, 2010 10:35 AM
> To: Pete Lancashire
> Cc: boatanchors at mailman.qth.net; test-equipment at mailman.qth.net
> Subject: Re: [Test-Equipment] [Boatanchors] TV-2
>
>
> On Jul 12, 2010, at 12:47 PM, Pete Lancashire wrote:
>
>> After a surf of the net via Google .. I have a question.
>>
>> What does one do now days for calibration tubes / references ?
>
> Check out Alan Douglas's book on vintage tube testers and test equipment. 
> If
> I recall correctly, he's got a calibration circuit for Hickok-style tube
> testers (TV-2 is of that class). Something like injecting a 5 milliamp 60
> cycle current into the plate circuit; I don't really recall the details.
>
> Best regards,
> -Steve
>
> -- 
> Steve Byan <stevebyan at me.com>
> Littleton, MA 01460
>
>
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html