- Best for tube amp builders or restorers seeking affordable 7591A replacements who accept tested singles rather than a tight matched pair. - Used condition with base damage noted; tubes test functional but below excellent spec (6950 and 8070 micromhos versus 6630 pass threshold), suitable for non-critical amp positions. - Seller doubledtoobs has 1355 feedback ratings at 100.0% positive, established vacuum tube specialist. - Free shipping, in stock and ready to ship. - Two Fisher 7591A tubes, United States origin, both tested on Amplitrex AT-1000 fixed bias mode; not matched pair but confirmed working singles. - Before purchase, confirm base damage does not affect tube function in your specific amp circuit and verify 7591A socket compatibility with your amplifier model.
Generated from listing data by BayPoint AI · Verify details on eBay before purchase.