Tag: Tube Tester Calibration

Precision 10-12 tube tester, later model with improved circuitry. Wood case is in excellent condition. Fully restored and calibrated.

Precision 10-12 solid-state prototype tube tester, a rare development model. Fully restored and calibrated with good cosmetics.

Precision 10-12 tube tester, early model with excellent wood case. Fully restored and calibrated for accurate testing.

Pristine Precision 612 Tube Tester.

Precision 954 tube tester with a really nice wood case. Fully restored and calibrated with excellent cosmetics.

Precision 920 tube tester with a real nice wood case. Fully restored, calibrated, and in excellent working condition.