@shakti good point re B4 label still saying ECC82.
I guess I was thrown by this comment by Lampi, suggesting maybe more than just shipping with different tubes, eg. a change to the operating points inside the analog section: Another big change is in the analog section where big and bold 12BH7 dual triode replaced ECC82 as output driver.
But of course one can run run higher plate current all else being equal if the circuit is up for it. (I actually run ECC32's instead of the 6SN7's on my B3 with Lampi's blessing, and they have higher heater current).
[Edit: additionally, it looks like the output impedance and output voltage have changed].
I guess I was thrown by this comment by Lampi, suggesting maybe more than just shipping with different tubes, eg. a change to the operating points inside the analog section: Another big change is in the analog section where big and bold 12BH7 dual triode replaced ECC82 as output driver.
But of course one can run run higher plate current all else being equal if the circuit is up for it. (I actually run ECC32's instead of the 6SN7's on my B3 with Lampi's blessing, and they have higher heater current).
[Edit: additionally, it looks like the output impedance and output voltage have changed].
Last edited: