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Posted
1 hour ago, King Tut said:

What’s a tube roll?

Substituting different preamp tubes in order to change the characteristics of the amp; 12AU7 for 12AX7, Tungsol for JJ, that sort of thing.

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Posted
1 hour ago, Muzz said:

Substituting different preamp tubes in order to change the characteristics of the amp; 12AU7 for 12AX7, Tungsol for JJ, that sort of thing.

Yes , correctly .... (N)OS / new ....

I have had the Amp a week now ... Have a gig tomorrow , so have not tried yet ...

Posted
3 hours ago, Niiranen said:

Yes , correctly .... (N)OS / new ....

I have had the Amp a week now ... Have a gig tomorrow , so have not tried yet ...

There’s three tubes in there iirc

Posted (edited)

That's not true in my experience.  The 12AU7/ECC82 has a smaller amplification factor, µ, and has a greater anode dissipation but cannot draw more power replacing a 12AX7/ECC83.

Edited by BassmanPaul
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