Audio Research VS110, VS115?

Hi Daveyf and Fsonicsmith,

Thank you so very much for your useful information!

Daveyf, once putting new tubes into the D70 and having it biased, how long, on average, will the amp once again require biasing?

Thanks,

Adrian

Adrian, That is a very difficult question to answer... it probably depends to some extent on the quality of your tubes and the amount of turn on/turn off's that the tube cycles. Also, possibly there is a factor of how much ventilation etc. that the tube sees. In my case, I have had no drift of the bias setting after a couple of hundred hours, but i couldn't tell you how long that will last for.
I think that a more appropriate question would be how much is the typical re-biasing cost for a tech to do the work once the bias has floated or new tubes need to be inserted. That answer probably depends greatly on who is doing the work and again I would suggest asking questions of a nearby tech if you have access to one.

I started a new thread.  See Audio Research VT100 Mk1.