>
>Re tuning the input networks on any GG amp:
>
>I know this has been said before, but I'll say it again.
>
>First determine the cathode impedance of the tubes in your amp. Ask
>somebody, look it up, or calculate it if you're into S&M.
>
>Take a small carbon or good metal film resistor of a value equal to the
>combined impedance of the tubes in you amp and tack solder it from the
>cathodes to ground.
>
>Do not even plug your amp into the AC mains. Just stick your favorite
>impedance bridge onto the input connector, jam the relays over if
>necessary, and tune away. No HV, no hassle, no problem. Be sure to take out
>the resistor when you are finished.
>
>Been doin' it that way for about 30 yrs now, never missed the mark yet.
>
>73,
>
>Larry - W7IUV
>
>--
I´ve done the same for years and years and
it works just great.
73, Jim SM2EKM
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