Condition: NIB - Original Siemens & Halske "Made in Germany" in genuine blue/orange box and O-getter. This is the 7 Volt heater version of the 6DJ8/ECC88. Siemens ≠ production code etched in the glass. In most amplifiers the PCC88/7DJ8 can be substituted for the more expensive 6DJ8/ECC88/CV5358/6922. Recommended for: EAR 88PB, NAT Signature.