5389 Ville Rosa Lane--Hazelwood, MO 63042 USA
Phone: 314-770-0119 Fax: 314-770-9448
The B&K 747 is a transconductance type tube tester that does a decent job of testing many of the newer tubes. Unlike the 700/707, this tester is totally solid state. This tester only checks more modern tubes and is not recommended for antique radio repair. It is more suited for the guitar amp service man or CB/Ham service shop since it checks all of the octal and later type power tubes and is able to check double triodes like 12AX7's without any control resetting.
Measures mutual transconductance
Meter has bad-?-good scale. It is also calibrated in percent of rated transconductance
Only 2 knobs to set! You need only to set the filament voltage and sensitivity adjustment. If you check a tube on the lower bank of sockets (later type sockets like 12 pin compactron), you need to adjust 4 additional knobs.
Measures grid leakage and shorts with meter
Has "Test 2" button which tests the second section of a double section tube such as 12AX7. No need to make any knob adjustments
Tests octal, 7 & 9 pin minature, 9 & 12 pin compactron tubes.
Includes instruction manual and set-up book