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In my experience of servicing VTLs across 20 years or so,

VTL amps are often designed running the output tubes WAY over their screen and anode voltage ratings!

I even confronted Luke Manley about this once at a hifi show, and he admitted it but said the tubes they supply are built to special standards and you HAVE to use their tubes in their amps.

To this I say B***S***!

If they have a special tube built, then it should have a special number and not cause techs all over problems when they re-tube a VTL using what would appear to be perfectly acceptable tubes.

I've gone as far as changing VTL's to cathode bias to try and maintain some reliability - it worked but lost some power.

Allen

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