- Best for vintage tube amplifier owners or audio enthusiasts restoring equipment requiring matched ECC40 pairs with traceable provenance and factory testing. - Open box condition means tubes are functional and tested but packaging is unsealed; expect full operational capability without original factory sealing. - Seller has 3,664 feedback ratings at 99.9% positive over established history, indicating consistent reliable transactions in vintage tube category. - Shipping is $12.95 with in-stock availability; no expedited option mentioned, so standard handling timeline applies. - Matched pair of Philips Miniwatt ECC40 (also labeled AA61/CV3884) manufactured in France; both tubes tested and documented near-new condition. - Before purchase, confirm test results documentation is included and verify tube serial numbers match the listing description to ensure actual matching pair authenticity.
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