B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 0

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 1

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 2

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 3

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 4

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 5

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 6

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 7

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 8

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 9

B&K 707 Mutual Conductance TUBE TESTER - RE-CAPPED CALIBRATED & 12AX7 MODIFIED, US $420.00 – Picture 10

B&k 707 Mutual Conductance Tube Tester - Re-capped Calibrated & 12ax7 Modified

US $420.00

Bradenton, Florida, United States
Jan 29th

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Here is a mutual conductance tester you can be proud of and count on for decades to come, a beautiful refubished, calibrated, and improved B&K 707. This one was from Glendale Union High School, Phoenix, AZ and has not seen much use - a great thing! Very well preserved and super clean from that dry climate. Last of the 707 testers, late production date - put into service 11/73. Much time was spent carefully cleaning and polishing this tester, then completely re-capped with Sprague Atom and Illinois (4 caps), resistors checked, meter circuit checked, tubes checked and 83 tube replaced with silicon diodes, unit fully calibrated (adjusted shorts detection; leakage circuit, grid emmision, signal voltage; dc bias & balance all according to B&K instructions), checked DC plate voltage & DC screen voltage, then 12AX7 AND 6BQ5 modified. The 12AX7 modification brings the correct bias voltage to the new 12AX7 socket (number 24) for test results we want and expect to see - ranging from 0 to 120, not 0 to 30 (with 22 min good) as is stock. A wonderful modification as no one likes the design defect of the 22 min 12AX7 testers (all B&K, Hickok,...). If you want to test the old way though, it is still there available on socket 8. Either way you test each side of the 12AX7 with test buttons 1 and 2, no need to reset any controls. 6BQ5 new bias also brought to 6BQ5 test socket to give you a more accurate & professional test. Meter lens polished, excellent outer case cleaned, chrome/nickel plated corners, hinges and latches polished as well. 4 new rubber feet attached to the case bottom so no more worries of damage when putting it on a surface. Lid hinges & latches work smoothly, 100%. Repro manual also included that has the set-up charts - nice and new and white on heavier than normal paper. Will test 6LQ6 6JE6C 6LB6 and other compactrons ... as well as all your octal, 7 pin, and 9 pin preamp tubes. Top grade calibrated tester ready to give accurate test results. Take a look at this superior, clean, late date production machine and bring it home. Winner will be very pleased. Includes the grid/plate cap connector as well (not pictured.) Will ship fully insured. Shipping rate by distance now from me here in FL at 34207, does it get any more fair.

Condition	Seller refurbished : An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller’s listing for full details.
Seller Notes	“6BQ5 MOD also! Super clean, from AZ.”