[Heathkit] Fw: Re: Tube Tester IT-17

[manualman at juno.com]

Let me further clarify. The TC-1 and TC-2 use the same chart. IT-17,
IT-21, and IT-3117 use a different chart. My comparison was made with a
TC-1/TC-2 chart dated February 1977 and a IT-17/21/3117 chart dated
1975/76. Even the filament selector voltage setting for checking for
continuity or short tests is different in both charts.

Pete

--------- Forwarded message ----------
From: <manualman at juno.com>
To: gsteffens at bevcomm.net
Cc: heathkit at mailman.qth.net
Date: Tue, 9 Jul 2013 02:45:24 -0400
Subject: Re: [Heathkit] Tube Tester IT-17

Not true for many tubes. Although the "Type", "Fil.", and "Plate" values
are fairly consistent or close for tubes that are listed in both charts,
the settings for the "A through K" lever switches are not. Out of thirty
random samples of tubes numbers between both charts, only three of them
had the same position settings of the lever switches. Unless you want to
play mystery roulette with the testing of your tubes, I would use the
appropriate chart for your tube tester.

Pete, wa2cwa
http://www.manualman.com

On Sun, 7 Jul 2013 21:30:35 -0500 "Gerry Steffens"
<gsteffens at bevcomm.net> writes:
> Yes, according to a presentation at the recent Michigan Antique Radio 
> Club
> Extravaganza 2013 by a member of the Tube Collector's Group.
> 
> The data is the same for TC-1, TC-2, IT-17, IT-21,IT-3117.
> 
> Gerry
> 
> Cheers,
> Gerry
> 
> Radio Historian,
> Collecting E.H. Scott, McMurdo Silver, Hallicrafters,
> National, Zenith Transoceanic, & any other interesting
> radios & classic Oldsmobiles - Collection stands
> about 300 radios, 5 Olds
> 
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Gary H. 
> Harmon, Jr.
> Sent: Sunday, July 07, 2013 9:20 PM
> To: Heathkit1 ; Heathkit2 ; Heathkit3 LIST
> Subject: [Heathkit] Tube Tester IT-17
> 
> Will the supplemental data for the TC-1, TC-2 and TC-3 work on the 
> IT-17
> tube tester??
> 
>  
> 
> 73,
> 
>  
> 
> Gary H. Harmon, Jr. - K5JWK
> 
> 6003 Archwood
> 
> San Antonio, TX 78239-1504
> 
> 210.657.1549h / 210.884.6926c/t