NRI Model 70 Vacuum Tube Tester, US $460 – Picture 0

NRI Model 70 Vacuum Tube Tester, US $460 – Picture 1

NRI Model 70 Vacuum Tube Tester, US $460 – Picture 2

NRI Model 70 Vacuum Tube Tester, US $460 – Picture 3

NRI Model 70 Vacuum Tube Tester, US $460 – Picture 4

NRI Model 70 Vacuum Tube Tester, US $460 – Picture 5

Nri Model 70 Vacuum Tube Tester

US $460

Deerfield Beach, Florida, United States
Jan 29th

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This NRI Model 70 Vacuum Tube Tester is in fantastic condition, & seems to be working perfectly, although I'm sure it'll need to be re-calibrated after shipping. The hinged lid slides off for full access, the wired adapter pulls out from the front ( see the wire hanging in the picture? ), and all 8 rubber feet are intact. International shipping is 12.50 lbs. Thanks for looking! from the internet - This article will discuss repair and calibration of the NRI Professional model 70 tube tester. High voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. NRI 70 beautiful hardwood case Introduction Built by Precision Apparatus Co for NRI, the high-quality craftsmanship of the NRI Professional model 70 tube tester is readily apparent. It has a beautiful hardwood case (appears to be oak or birch) with finger-joint construction. Eight rubber feet protect your desktop in both the working position and the standup position. Internally, the tester uses a large beefy transformer and quality Pace (Precision Apparatus) meter movement. The tester has very small size, measuring only 10.75 x 10.75 x 6.25 inches (27cm x 27cm x 16cm) and weighs a hefty 10.4 lbs (4.7 kg). Most of the weight is due to the large transformer and hardwood case. The NRI 70 has eight built-in sockets consisting of 4-pin, 5-pin, 6-pin, 7-pin large, 7-pin miniature, octal, loctal, and 9-pin miniature. All sockets use standard wiring (1-to-1, 2-to-2, etc.), and the control lever numbers correspond to their RTMA pin numbers (Lever 1 controls socket pin 1, Lever 2 control socket pin 2, etc.) The makes operation much more simple than testers using non-standard socket wiring because each operating lever corresponds to its RTMA pin number (eg: moving lever 5 engages pin 5 for the tube). Standard RTMA wiring also allows you to easily make a Novar or Nuvistor socket adapter if so desired. This unit has the latest known roll chart installed (1963), and I also include a new reprint of the manual (exclusive to TubeSound, because I personally recreated the instructions from scratch), and two large Supplementary tube charts. The charts have good coverage for many tube types: antique tubes (ex. 01A, PJ-8, #10, #27, #45, #50, #71A, #80, #83, 6E5/6G5, etc); Western Electric (ex. 274A, 300B, 350A, 350B, 401A, 407A, 408A, etc); Ham Radio (ex. 807, 809, 811A, 866A, 866Jr., 6146, etc), modern audiophile tubes (ex. KT66, 6CA7/EL34, 6550, 6CA4, 6BQ5/EL84, 5AR4, 7591, 7027, 6267,6336A, 6973, 7247, 7868, 7027, 6072, etc.) Obviously, with 10 function levers the tester is not designed to test modern 12-pin compactron tubes (such as 8950, 6KD6, etc.) although a small number of compactron/duodecar-base have chart listings and can be tested with adapters (6K11, for example). The NRI Professional model 70 uses a traditional cathode emission test circuit to analyze tube quality. Shorts and Leakage detection is accomplished with a NE-57 neon lamp circuit. Sensitivity for leakage detection can be set by changing the value of R8 resistor to your preference.

Condition	Used : An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections.
Seller Notes	“Vintage tube tester in fantastic condition! Please see the pics!”