I found these pics of a vintage DR103, it has 3 subtle mods that I can see in the photos, and as indicated on the schematic:
1) There is a capacitor installed across the V1A plate load resistor (value unknown)
2) The V1A coupling capacitor appears to have been changed, but the value is not known
3) There is a capacitor installed across the V4A and V4B (phase inverter) plates (again, value unknown)
(It also has the Canadian Importer "1-wire" cascaded gain mod, I do know what that is and what it does).
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Without knowing the exact values, can an expert please help me to understand in theory what these capacitor alterations would do?
The REAL Joe