Tested on the Amplitrex AT1000, with results shown in the table below. Actual manufacturer Tungsram. Number 12AX7. Small signal (i.e. 12AX7) tubes are generally checked for noise and microphonics; power tubes (i.e. 6L6) are usually not.
Upon request, you can also get a Pioneer sticker for the hood (as in the last photo). For sale: DUST COVER FOR PIONEER RT-701/RT-707. It is a replica, not the original Pioneer! The cover is supposed to be attached to the front panel, which protrudes by 1.5-2 mm.
Here we have for sale is an excellent rare Tungsram 12AX7 ECC83 Tube. Very rare tube here! Early production example with the highly sought after silver/nickle welded plates and foil disk getter. Strong tube with years of life left to enjoy in this great tube.
Upon request, you can also get a Pioneer (or logo + Pioneer) sticker for the hood (as in the last photo). For sale: DUST COVER FOR PIONEER RT-901/RT-909. It is a replica, not the original Pioneer! Transparent, (Option No. 1).