Matched quad – These were used for a quick tone test on an old Marshall. 1 has a red sharpie mark on the top.
Item Tag: TAD-EL34-STR-4
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NEW TAD EL34-STR **QUAD** Tubes Sweet Tone 6CA7 Valves Tested Tightly Matched
Tube Amp Dr in Germany does the primary QC. CALIFORNIA PROPOSITION 65 WARNING.