The weakpoint of Switchcraft type jacks is that they have no defined ground contact point and pressure even though there is a lot of of area. It is easy to measure a contact resistance of 0.5 Ohms or more. If the total contact resistance (including the cabinet jack) could be reduced by 0.8 Ohms , this would increase available output power by 10% @ 8Ohms.
Of course the result will depend on the contact material's quality (the best being phosphor bronze)/strength of the new jack.
That's what match book covers are for. (low tech 'back in the day' repair jobs)
The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.
It seems to me the pictures are all the stereo version - the ground contact is still the cylinder the jack is inserted through, so only the 'hot' contacts are doubled. I'd guess the ground contact (on both these and the stock Switchcrafts) are larger that the hot contacts -- as long as the jack and plug fit snugly together!
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