• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Anyone done their own curves for GM70?

Joined 2008
Paid Member
The two sets of curves easily found on the web have fairly substantial disagreements. The prettier set comes from an English only page, but without confirmation there's no reason to believe it over the less than wonderful (for audio) looking manufacturer's sheet. Has anyone done their own set?



  • GM70 Curves Russian Data..jpg
    GM70 Curves Russian Data..jpg
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  • GM70 Curves English Page.jpg
    GM70 Curves English Page.jpg
    86.5 KB · Views: 49