This is the sought-after B&K 747B mutual conductance tube tester, one of B&K’s most advanced and user-friendly models. It features true mutual conductance (Gm) testing, allowing accurate evaluation of a wide range of tubes. The solid-state design offers reliability without the warm-up time required by older models.
I have calibrated and thoroughly tested this unit. All functions perform as they should. The front panel is clean, all switches and controls operate smoothly, and the tube settings manual is intact and legible.
The case is in very good condition with only minor wear from normal use and one scuff on the top. I’ve cleaned and reconditioned the case.
This B&K tube tester is ready for service on your bench and makes an excellent choice for tube enthusiasts, audio techs, or restorers who need reliable results. It also comes with a one-year warranty for your peace of mind. See warranty details here.
Restoration:
- Replace Capacitors – replaced capacitors prone to failure
- Power Cord – new power cord for safety
- Calibrated and tested – calibrated to factory specifications and checked for accuracy across tube types
- Reconditioned Case – case was cleaned and reconditioned
- Tube Data Book – replaced tube data book spline and retainer
- Clean front panel – all controls operate smoothly
Key Features:
- Tests a wide variety of tube types with quick, easy setup
- Solid-state design – reliable performance with no warm-up time
- Case is in very good condition – only minor signs of normal use
- Ideal for audio techs, restorers, and hobbyists
- Professional-grade tester that delivers consistent, reliable results
Condition:
Electrically, the unit is is very good condition and required a minimum restoration. The tube settings manual spiral binding was falling apart and the manual was falling loose. I replaced the spiral binding and fixed the retainer that holds the manual in place when the top cover is closed.
This is a clean, ready-to-use example of one of B&K’s most respected testers. Don’t miss this chance to own a well-preserved, calibrated example of a top-tier B&K tube tester.
The manual is available to download here.
This B&K 747B tube tester is $750 plus shipping to the lower 48 states only because of the weight.
Contact Me if you are interested in this tube tester.
