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I have a really nice Mullard tube here made at the famous Blackburn factory. Both sides of rectifier test as NOS. This tube is perfectly balanced. Box for this one got wet and I threw it out. The tube is perfect in every way.
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.