Siemens German made, 6155 RS685/RS1007 output power tetrodes, tested, clean and ready to plug into finals of your amplifier. These have 1980's date codes, are in original boxes as shown and show no signs of ever being used.
The price is per tube. Limited quantities available.
This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery
Most of the boxes have markings for both RS685 and RS1007, from what I can tell there is no difference (if you know what difference there might be, please let me know), all the cross references I have list both types as equivalent to 6155 (which is functionally similar to 4-125A except it has no base ring). Also equivalent to QB3-300 and QY3-125 (why are there so many numbers for what's basically all the same thing?)