Friedman C45 setting on Marshall mods and og BEs

[SpiderWars]

My memory is failing me and I cant remember the exact history. As I recall the old modded Marshalls had a C45 switch that changed the circuit between the first and second gain stage using the same 1M Volume (gain) pot. The 'stock' setting was basically the one-wire mod and used a 2n2 coupler with the 68k/68k divider. The other setting (the C45 setting) used a 22n coupler and then had a treble peaker circuit of 470k//470pF with 220k to ground instead of the simple divider.

I think the og BE amps had this switch but did it go away at some point? Do the BE Deluxe amps have it? I think the 68k/68k divider evolved to some slightly different values for more gain, like 68k/82k or even 68k/100k.

In any case, I've used this C45 arrangement but without changing the coupler; keeping the 2n2, in two different amps now and I like it better. I preferred the straight divider when using the 22n coupler with the C45 mod but with the 2n2 I like the C45 better. I'm using a 470p//470k with 270k to ground and usually comparing to a 68k/82k divider (one amp still has the switch which I call '6-pack' because the C45 is a little fat and sloppy). I'm also not shooting for high gain, just cranked plexi with a little extra.

I was just removing the diodes and putting the switches to better use and noticed it.

3-way bright (1n-OFF-4n7) and pull Boost on gain pot.

 

[fusedbrain]

My BE100 is from 2015.
It has a fat switch to parallel a .022uf cap over the .0022uf coupler, and C45 switch.
The C45 switches the voltage dividers, as you said. Position 1 is 68k/68k, and pos 2 is 560k/220k, with 680pf over the 560k.
Edit: I typed 280k, it should be 220k.

 

[Bxlxaxkxe]

The current BE deluxe does still has the C45 switch

 

[SpiderWars]

My BE100 is from 2015.
It has a fat switch to parallel a .022uf cap over the .0022uf coupler, and C45 switch.
The C45 switches the voltage dividers, as you said. Position 1 is 68k/68k, and pos 2 is 560k/220k, with 680pf over the 560k.
Edit: I typed 280k, it should be 220k.

Cool, yeah that's right there were some different values in there and the separate Fat swith. I increased the 220k (270k in my case) to 470k and liked the slight extra gain so now its just the typ Marshall 470k//470p with 470k to ground. This amp has been a work in progress. It's better now than ever but still not like my Superlead.

 

[V2a]

68k/68k lowers the gain and tightens up the low end. So when you go with the C45 divider, try using a 1n5 or 1n coupling cap (to tighten low end) and a 220k or 270k anode resistor (vs. 330k; to lower gain).

 

[SpiderWars]

68k/68k lowers the gain and tightens up the low end. So when you go with the C45 divider, try using a 1n5 or 1n coupling cap (to tighten low end) and a 220k or 270k anode resistor (vs. 330k; to lower gain).

The tighter low end was something I liked and was sometimes needed in the previous amps. But sometimes the amp can do it and not get farty/flubby or out of control.

 

[Variable]

The current BE deluxe does still has the C45 switch

50 or 100 watt? I have the BE-50 Deluxe and it doesn't have C45. It has Sat and the three way Gain Structure switch on the back.

The 100 watt does have it, though. But you lose out on the Buxom Betty clean with the 100, which IMHO is the whole reason to get the 50 (not knocking the Plexi clean because it's great too and does something different, but the BB clean is nuts).