The sellers of these tubes are a fragmented lot and I have read that there were tubes that did not make the grade smuggled out of the factory that are being sold. These tubes may have a shorter life. I have had good dealings with h_salience an auction site seller.
I would like to see a seller add descriptions of the basic sonic character of the many varients.
The issue with the coveted NOS/old production is that good examples are hard to find and they are close to or higher in price than the new production.
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