B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 0

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 1

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 2

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 3

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 4

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 5

B&K 707 TUBE TESTER CLEANED SERVICED AND CALIBRATED, US $399.00 – Picture 6

B&k 707 Tube Tester Cleaned Serviced And Calibrated

US $399.00

Woodland, Washington, United States
Jan 29th

Open on mobile:
QR code

The B&K 707 is the ultimate professional-grade tester for any user that values his or her time and appreciates convenience. This tester has been calibrated and cleaned. This is what was done: Cleaned all switches and tube sockets with Dexoit contact cleaner; Replaced all electrolytic capacitors, this is a must do. The capacitor has electrolyte oxide layers that will break down and rupture after 15 years. The last 707 was made in 1970 so the life of the capacitor has expired. This issue alone will put the tester out of calibration. I checked all voltages and bridge resistors; Made all service adjustments according to B&K standards; Adjusted operation of short detection and leakage circuitry, grid emission, signal voltage, DC Bias balance and balance control. The type 83 mercury vapor full wave rectifier tube will be replaced with a fused to protect your transformer Solid State Regulated Rectifier. This greatly improves the performance of the tester with much better balance control. If you're testing 12AX7 I have added the modification that greatly improves this test. Tester comes with the Instruction Manual, Tube Chart and plate cap wire. What are my qualifications? I taught electronics at a local Technical College for 20 years and have a FCC technician license. I have sold hundreds of these tester on Ebay and if you need yours repaired I can do that as well. This tester features a clever voltage control circuit that eliminates the need to constantly set the AC line level to insure accurate tests, regardless of line voltage variations. Has sockets for most late model hifi tubes, including compactrons, novar, duodecal, and Nuvistors. Dyna Jet System, where many popular tubes can be tested by just setting two dials. Dual section tubes can be checked with just two push buttons. Sensitive grid leakage and shorts read on the meter and on a neon lamp, indicating grid emissions, internal shorts, or gas. Life-test push button, which will indicate on the meter, gives indication of relative good use left in a tube.

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	“This tester is in good condition.”