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Dynaco st-70, tube discontinued, any other solution


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Good Day,


i have a Dynaco st-70 back-up amp, but i learn this week, that my preamp tube are now discontinued.


Any upgraded possible? 12ax7?


price for 7199 are skyrocketing? so i am searching alternative and if possible, better sound?


Also i have el34 Mullard, new stuff, will it sound better with 6ca7 big bottle E-Harmonix?




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"Like it, but no 12ax7, solution?"


A 12AX7 is a dual triode, a 7199 has a triode and a pentode in the same tube (as does the 6U8A).


In the Dynaco the pentode is for voltage gain, the triode is the phase-splitter.

Edited by djk
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