See this thread, where my modding process is described:
viewtopic.php?f=59&t=116020
Final list of mods done by me:
1) Mercury Magnetics transformers
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2) TAD/Mojo Dijon dirty signal and tone caps (
stock are WIMA's)
3) ERO/Roederstein MKT1813 cathode bypass caps (
stock are Evix MMK for 1st gain stage, tantalum for Structure and MF for Factory Gain Mod)
4) Mallory 150 PI output caps (
stock are WIMA's)
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5) R6 1st gain stage SPDT 2-way switch: 820R//0.68uF | 1.5K//1uF (
switch between stock and modded values)
6) R11 2nd gain stage: 2K7//2.2uF (
stock is bare 4.75K resistor)
7) R43 Structure resistor – 20K (
gives stock 2.38K total cathode resistance in H Structure position switch)
8) C2 Structure cap removed (
no need of this as cathode bypass cap is solder fixed to R11 resistor)
9) R12 3rd gain stage for Red bypass SPDT switch: .22uF+2.7K | -- | .68uF+10K (
Marvel Mod)
10) R19 3rd gain stage for Blue and 4th gain stage for Red bypass SPDT switch: 1uF | -- | .68uF (
aka Plexi Cap in some other amps)
11) C224 1nF dirty Boost cap removed
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12) C1 1st CC cap – 2.2nF//2.2nF (
not a mod actually, stock is 4.7nF)
13) C23 & C24 PI output caps – 47nF (
stock are 100nF)
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14) C40 470pF Excursion cap removed
15) R62 L Excursion resistor –> 1M linear pot // 320K resistor = ~250K (
Poweramp Resonance Pot)
16) Resonance cap SPDT switch: 2.2nF | --- | 470pF (
switched to 470pF goves stock config)
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17) dirty Treble linear pot (
stock is audio/log)
18) 10K Presence pots (
stock are 25K)
Regards, Andy