B K 747 Tube Tester. B&K 747 Tube Tester Photo 1127949 UK Audio Mart Hi everyone, I recently purchased a beautiful B&K 747 tube tester from a local friend All adjustments work great except setting the bias voltage..after replaceing electrolytic cap's & checking the resistor's & diode's for the bias circuit and transformer voltage and all checking o.k
B&K 747 Tube Tester Photo 1127949 UK Audio Mart from www.ukaudiomart.com
All adjustments work great except setting the bias voltage..after replaceing electrolytic cap's & checking the resistor's & diode's for the bias circuit and transformer voltage and all checking o.k It seems to function good after calibration, but noticed the Bias Voltage and Signal Level varies just a hair
B&K 747 Tube Tester Photo 1127949 UK Audio Mart
While in high school ( long ago in 2002 ), I also attended a part time tech school, taking a class on what else, electricity. One of the best vintage tube testers out there that isn't crazy expensive It will test 5AR4, 5U4, 6L6, 6V6, 6SN7, 6SL7, 6BQ5, 6CA4, 6CA7, EL34, 6DJ8, 12AT7, 12AU7, 12AX7.
B & K 747 tube tester — Polk Audio Forum. All adjustments work great except setting the bias voltage..after replaceing electrolytic cap's & checking the resistor's & diode's for the bias circuit and transformer voltage and all checking o.k Re: B&K 747 Tube Tester « Reply #1 on: January 04, 2024, 01:52:44 pm » Not inserting the tube until properly set up will prevent you from blowing up a 6 volt tube if the last one you tested was 12 volts and 12 volts is still being applied to the socket.
B & K 747 tube tester — Polk Audio Forum. Unlike the 700/707, this tester is totally solid state This is a mutual conductance type tester, which is one.