There were quite a few SF TR model variants over the years, which one did you have?
The mid-late 70s ones tended to use bass pots with ~30% taper, hence they were a lot more bassy at the typical control settings than the BF or earlier SF models with a 10% taper bass control.
The mid-late 70s ones tended to use bass pots with ~30% taper, hence they were a lot more bassy at the typical control settings than the BF or earlier SF models with a 10% taper bass control.
I think that the typical BF models, eg TR, mitigated blocking distortion (perhaps unwittingly) by means of the 1nF coupling cap to the LTP / power amp.
But apart from all that, I never would play a Twin with JBLs loud enough to induce severe blocking distortion.
Actually I'm not really convinced that blocking distortion generally/necessarily means bad sound. If you look at the schematic of a JTM45 (or a '59 BM), it should be prone to lots of blocking distortion. Also I found that I mostly prefer 0.1µ to 0.02µ power tube coupling caps.
Sorry for distracting.
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