The product is a set of (1) Mullard & (1) Telefunken ECC83 12AX7 tubes with O getters labeled “The Fisher” and tested excellent on both triodes for Gm on my rebuilt and calibrated B&K 707 tube tester.
The product is a set of (1) Mullard & (1) Telefunken ECC83 12AX7 tubes with O getters labeled “The Fisher” and tested excellent on both triodes for Gm on my rebuilt and calibrated B&K 707 tube tester.