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Appears that 13D4 preceded 13D5. These have the old style STC logos with BVA stamp. Etched tube type 1571 - one of the 12AU7 codes that was also used for Brimar ECC82 types like CV4003, 12AU7, CV4034 etc. From what we know, Brimar made 3 industrial ECC82 types, 13D4, 13D5 and later 13D8.
Matched Pairs - Like New Early 1960s BRIMAR 13D4 Industrial 12AU7 ECC82 CV4003 Long Plate tubes STC Production. Lightly used. Made in England. Real fine 12AU7 tubes, one of our favorites. Repacked in white boxes from bulk.
NOTE: Labels are not perfect on all tubes. Printing from that era is fragile and comes off easily with contact.
Tested and matched on Hickok 752, just recently calibrated and modified by Hickok expert to all Solid State to eliminate drift.
Price = $75 for the Matched Pair.
- Matched Pairs - Like New Early 1960s BRIMAR 13D4 Industrial 12AU7 ECC82 CV4003 Long Plate tubes STC Production. Lightly used. Made in England. Real fine 12AU7 tubes, one of our favorites.
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