1968 Manual & Set-Up for Accurate Instrument Model 257 Tube Tester + Supplements

Description

Accurate Instruments Model 257 Tube Tester Instruction Manual
Tubes Setup Data Chart
Schematic
Four Supplements!!!
Tube Interchangeabilty Chart
Here is a very nice copy of one of the latest manuals for the Accurate Instrument Co. Model 257 tube tester.  Dated 1/68 (January of 1968), this manual is complete.  It includes instructions, tube chart, a very nice schematic and
four Supplement Charts: 169, 170, 271 & 772!
If I understand the naming convention right, these supplements are dated 1/69, 1/70, 2/71 and 7/72 respectively.  Just these supplements make this book an exceptional value, but I'm also adding a Tube Interchangeability Chart that helps you test foreign tubes.
No pages are missing from the original.  This copy is from a vintage original, but it has been digitally cleaned up and is easy to read.  The 170, 271 & 772 supplements have some minor lines and marks.
The 257 tester can test a lot of the more recent tubes -- even Magnovals, Decals and 9+1 (B10G) Miniatures.  If you want a complete chart for your tester, this is it.  The original manual was in 4.25x5.5 booklet form.  This copy is standard 8.5x11 letter size, comb bound with Bristol covers.  The manual is printed 2-up so the original size is preserved.  However the schematic and supplements are printed letter size.
You can buy charts from other sellers, but you'll pay more AND you likely won't get as much and as recent.  Let me know if you have any questions.