simulate ultralinear transformer with resistors?

[imaradiostar]

Is it possible/worthwhile to simulate ultralinear tube operation by connecting the screens to a resistive divider connected between the plates and the centertap of the output transformer? Would this just end up sounding like triode mode?

jamie

[mooreamps]

I don't believe it would alter the plate transfer curve, as one would expect with ultra-linear operation. It would only lower the plate current of the power tube depending on the values selected in the resistive divider.

-g

[imaradiostar]

Makes sense- I read up on ultralinear operation and it seems like the effect is more related to the current feedback through the TF and less about a voltage being between plate and B+. There are plenty of inexpensive UL outputs out there between Triode Elec and Hammond so I figure I'll just try them when the need arises.

Till then I'm going to add negative feedback to my circuit and I might try a triode/pentode mode switch, just to see if it's complementary to this amp.

jamie

[Steve Conner]

I'm sure it would work fine. But the catch is that in order to make it work, you'd need low value resistors which would waste a lot of your output power.