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The timmy just adds more diodes depending on which position the switch is in, it’s not changing type (all silicon). Broadly speaking Ge clippers are smooth (in muff terms, we use these in the Ultrastoner to keep it nice and sludgy, but double them up so as not to lose too much vol), but you lose a lot of signal. LED clippers are much harder and let most through so seem louder (we use these in the TSM680 which are much harsher sounding). Si clippers are somewhere between the two (most muffs use these).
Germanium diodes are like 6V6s - low headroom, soft clipping.
Silicon diodes are like 6L6s - medium headroom, medium clipping.
LEDs are like 6550s - high headroom, hard clipping.
But like power valve types they don’t change the basic sound of the circuit - that’s more determined by the topology and other component values, just like a Tweed Deluxe won’t sound like a Blackface Twin if you replace the 6V6s with 6L6s.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Wouldn't be terribly hard to mock up and test with a little SPST switch, of course.
It's not like a 4-speaker cabinet where there is a difference between series-parallel and parallel-series - although the voltage division is likewise still the same, the link affects the damping factor because it alters the effective resistance each speaker sees from the other three.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I think it's this but it's early :
The forward voltage drop of the diodes in series is doubled, conducting only on higher peak voltages ... adding in the switch in one position gives symmetrical clipping at around 600mV moving the switch to the other position gives asymmetrical clipping of positive voltages of 600mV or so due to the single diode
At peak voltages above around 1100mV the top set will conduct in addition to the single lower pair meaning more compression of the peaks .... switching to the single diode means the same but lower voltages are asymmetrical clipped like as OD1
I could and probably am wrong