TT-1A Mutual Conductance Tube Tester

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TT-1/TT-1A

I bought another TT-1A, a 69 vintage in pristine condition.

The TT-1 was introduced in January 1960.

The TT-1A was introduced in March 0f 1962. An upgrade kit for the older TT-1 the TTA-1-1 was also offered that year for $19.95!

 

The TT-1 kit cost $134.95 originally and 149.95 for the TT-1A.  Today on eBay it sells for between 300 and 500 or more.  It is still a very good tube tester by any standards. The TT-1A is almost an exact copy of the Weston 981 tube tester.

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TT-1 Operation manual dated 3/8/63. I also have a manual dated 8/29/69 part number 595-330-02.  They removed the service section of it and added 1 paragraph about the supplement to roll chart data.

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TT-1A Assembly manual dated 10/4/63.

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TT-1 Assembly manual dated 3/8/63.  I also have a manual dated 4/4/69 part number 595-292-01.  It has the same number of pages, illustrations etc.  I could not find any changes.

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TT-1A tube supplement dated 1/1/64

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TT-1A tube supplement dated 1/1/66

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TT-1A tube supplement dated 5/1/69. This is a supplement to 1-1-69 roll chart.

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TT-1A tube supplement dated 11/78.   This is a a compilation of data up to November 78