Re: Mullard HSVT
Hello John
The VP23 valve is a variable mu pentode with a MO (Mazda Octal) base. The Mullard HSVT has a MO socket, third from the left on the first row, socket number 10. According to my valve list you do not need an adaptor, only card number 207 and the valve plugged into socket 10.
Regards Stan.
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