signs your pramp and power tubes need replacement


Having a little early fatigue from listening to newly aquired tube amp.
128x128lesvan

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I just bought a VTL IT-85 and I the sound is great very liquid..... but my ears started hurting, not good......... Thiel 1.5, PS audio plus spkr wire, Nordost Red Dawn Ics. The VTL just replaced a Mcintosh C15 and MC122 combo. Now I did check the tubes with a meter and the Ohms are reading 15 istead of 10........... the manual says to take it in for service with any reading other than 10............ the DC voltage was good. I guess I'm gonna send it to VTL. Does anyone know what the wrong ohmage reading on tubes mean.