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Durability is not less than 2000 hours. The weight of not more than 5 g Nuvistor 6N28B-B. This dual triode indirectly heated, designed for VLF. Do not have a clear microphone effect, thus, has a miniature size.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.