Tubes · 15. juli 2018

Yesterday I received a batch of tubes from France. It was a box with 5963 tubes, a special quality ECC82 or 12AU7 or 5814. These tubes 'made in USA' NOS (stated by seller), were used in the 1960's as computerparts, longlife 10.000 hours usually made for Hewlett Packard. These tubes are fairly unknown to the broader tube community as a very good replacement of types as ECC82 or 12AU7. However, I started testing the tubes - as I Always do when receiving new tubes- on my Amplitrex AT1000. I used...