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Rogue sphynx tube rolling

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sugbob21

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  • Posts: 166
Rogue sphynx tube rolling
« 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
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sfox7076

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  • Posts: 1327
Re: Rogue sphynx tube rolling
« Reply #1 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.
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Escott1377

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  • Posts: 560
Re: Rogue sphynx tube rolling
« Reply #2 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?
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