| Matched Pair 1957 RCA 12AX7 Audio Preamp Tubes | $36.00 |
| Matched Pair 1957 RCA 12AX7 Audio Preamp Tubes | $51.35 |
| Matched Pair 1960 Raytheon 12AX7 Audio Preamp Tubes | $16.50 |
| Matched Pair 1965 Sylvania 12AX7 Audio Preamp Tubes | $19.84 |
| Matched Pair 1965 Sylvania 12AX7 Audio Preamp Tubes | $22.01 |
| Matched Pair 1965 Sylvania 12AX7 Audio Preamp Tubes | $19.05 |
| Matched Pair RCA JRC 12AX7 Black Plate Tubes ! ! | $36.98 |
| MATCHED PAIR BOXED RCA ECC83 / 12AX7 / 7025 AUDIO TUBES | $46.00 |
| Procomm NOS Matched PAIR 5751 (12AX7) USA test great! | $25.99 |
| Telefunken 12AX7 Vintage Matched Pair ECC83 Tubes Test | $102.50 |
| Matched Pair 1957 RCA 12AX7 Audio Preamp Tubes | $51.35 |
| Matched Pair 1960 Raytheon 12AX7 Audio Preamp Tubes | $41.00 |
| Matched Pair 1960 Raytheon 12AX7 Audio Preamp Tubes | $25.07 |
| Matched Pair 1965 Sylvania 12AX7 Audio Preamp Tubes | $20.39 |
| Telefunken 12AX7/ECC83 Dual Triode PAIR, WELL MATCHED ! | $51.99 |
| Telefunken 12AX7/ECC83 Dual Triode PAIR, WELL MATCHED ! | $49.99 |
| 2 NOS/NIB Matched Pair Tubes CV4004 BRIMAR ECC83/12AX7 | $110.00 |
| 5751 TUBE AMP GE GREEN WHITE 12AX7 TUBES MATCHED PAIR | $12.50 |
| close matched pair M8137 from mullard 12AX7 / ECC83 | $99.00 |
| Perfectly Matched Pair EI 12AX7/ECC83 Tubes NOS | $19.00 |
| Perfectly Matched Pair EI 12AX7/ECC83 Tubes NOS | $20.50 |
| Perfectly Matched Pair EI Elite Gold 12AX7 Tubes NOS | $30.00 |
| MATCHED PAIR AMPEREX 12AX7A Audio TUBES 12AX7 Vintage | $31.00 |
| Pair MATCHED FISHER AMPEREX HOLLAND 12AX7/ECC83 Tubes | $27.00 |
| RCA 12AX7 / ECC 83 Matched Pair NOS NIB | $41.00 |
| BRIMAR 12AX7 ECC83 TUBES (NOS) MATCHED PAIR | $83.00 |