Londoner L100A solid state guitar amp - info and help required

[J M Fahey]

Here is the preamp schematic. The Tone switch is a gyrator notch filter. I can't see the value of the silver capacitor on the tone board but if
I assume it is 1000PF the frequencies are: 1 - Flat, 2 - 230Hz, 3 - 1kHz, 4 - 3.4kHz. If you can read the value, let me know.
I couldn't draw the reverb section because the foil side is hidden by the footswitch jack. If you can move it and post a photo I can do it.
If you want to lift the power board and post a photo of the foil side I can do that too.

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Thanks Dmeek, incredible job, as usual.

What I find *weird* is that the exact same amp (differences are just "modernization" but design/ideas are the same) was made "on both sides of "the Curtain/Wall"" because Regent maker was an East German/DDR State run Factory.
So much so that components used are "Soviet Block" type.
Transistors are Tesla, made in Czekoslovakia, guess other components too.

Not sure where did "the Reds" get Reverb tanks, for example.

Also curious about what speakers were fit in those amps.

My point is that *maybe* East Germans copied a British amp (although an earlier discrete transistor version), the opposite sounds unlikely.
But the Londoner uses American transistors (RCA) and ICs (Texas Instruments) but Britiish Cliff jacks and capacitors.
No brand visible but those large Blue ones look same (or very similar) to those used by Marshall.

Mysteries of International trade.