These are made in India by BEL factory with Philips/Mullard tooling and engineering in the 1970's-80's. These have "V" factory code and identical plate structure with 3 holes to Mullard ECC81 tubes. That's why these are often referred to as "Indian Mullard". These are mostly labeled and boxed for National which is brand name owned by Richardson Electronics USA. The other labels are Haltron B309, Ultron and Trigon/UK.
Quantity in Stock : 160 pcs
Price : US$7,00/each; US$16,00/matched pair
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