I just looked at some on ebay. The tubes that are being sold as a 7316 alternate for 12au7's are stamped 7316.
8 responses Add your response
@ZD542 I get email alerts for this tube and the vast majority of tubes given that name are not real. The tubes have to come from Holland the Heerland plant was the place Philips decided to make this tube. That simple criteria is frequently not even fulfill they should be labeled as Amperex. Amperex should be on tubes not contracted for industry. When I see a industry pull I am more convinced about it's being a 7316. Tubes can be labeled 7316 but do not fulfill the other code requirements. The label isn't the way you decide if it is a true 7316, in the very it must be a Philips made at Heerlen the only place they were made.
That said, I don't know what the current inventory of 7316 tubes is on ebay is at he moment. Recently there were Tungsram tubes being offered with that appellation clearly on the tubes with 7316 printed on the tube. I get similar offers by email every morning. The tubes I have seen over the past year are simply not all 7316s. The fraction of the true tube. seems to be smaller and smaller.
I have seen this before with a scarce tube type getting big money. Overnight every body has some to sell.
thanks for your thoughts and posts.