AudioCircle

Audio/Video Gear and Systems => Tube-o-phile Circle => Topic started by: sugbob21 on 3 Jan 2018, 04:34 pm

Title: Rogue sphynx tube rolling
Post by: sugbob21 on 3 Jan 2018, 04:34 pm

is it safe to swap out JJ 12 AU7 tubes and replace with Tung Sol 12 AT7 's ?
Can anyone recommend a tube upgrade if I can't ?

thanks

Title: Re: Rogue sphynx tube rolling
Post by: sfox7076 on 3 Jan 2018, 05:03 pm

You can, but there is going to be a change in the level of gain.  It won't blow anything up, so you can try it, but it is not ideal.  Just get some 12AU7s. They made thousands.

Title: Re: Rogue sphynx tube rolling
Post by: Escott1377 on 3 Jan 2018, 10:25 pm

I thought it was the other way around due to mu factor and heater current?

In other words, if a 12AT7 is required, a 12AU7 can be a sub and not vice versa based on what the minimum that the circuit will provide?