I have about 18 of these tubes, all NOS. They are a more rugged version of the 12AX7 and known for low-noise. Nice sounding tube!Bought in 1998 brand new and never been useView attachment 152508View attachment 152509
I have about 18 of these tubes, all NOS. They are a more rugged version of the 12AX7 and known for low-noise. Nice sounding tube!Bought in 1998 brand new and never been useView attachment 152508View attachment 152509
There are Ten versions of M8137, make sure you got the early oneI have about 18 of these tubes, all NOS. They are a more rugged version of the 12AX7 and known for low-noise. Nice sounding tube!
Don't add anode voltage right away, let these treasures awaken slow from their 60 years slumber.Imagine you have a hangover after a weekend of drinking you don't work well right away![]()
It’s a mix of older and newer. I bought them 25 years ago. So they are what they are.There are Ten versions of M8137, make sure you got the early one
Thank you so much for sharing ,most of them were 1960s
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