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RE: Decipher This

GEO,

The big problem with mesh tubes is they tend to draw more grid current for some reason. The Moth's and other directly coupled amps that did not have good time constants for the power supplies, would tend to push the grid forward when turned off and this would cause the output tube to arc over.

There was tons of stories like this with the EML and other mesh plate tubes. But I think the problem was the design of the tubes. I have a boat load of NOS mesh 45's and never had problems other then just dieing. But the newer ones I had customer problems and tons of people they just died and I don't direct couple them.

I think they are using gold grids now for these tubes to better insulate them from drawing grid current.

Thanks,
Gordon
J. Gordon Rankin

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