Re: Ferrograph 4 with Amp problems.
The Series 2 and Series 3 power supply circuitry is basically the same as the Series 4 schematic above, with C24 (16uF/500V) and C26 (8uF/500V) again being the filter/smoothing and reservoir capacitors respectively.
The other dual can capacitor (C29 16uF/500V & C30 16uF/500V) looks to be a bit taller, so your reservoir capacitor (C26) will be in the slightly shorter can (as shown in the Series 4 Power Unit image above).
David
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