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Comments
20 is fine. Marshall's cable looks very thin, but that's mostly because the plastic covering is a lot thinner than similar wire gauge cable has.
The bigger problem is those horrible switching panels Marshall fit to the modern 1960 - if you cab has one of those, remove the PCB and fit two standard Cliff panel-mount jacks in the holes, wire them in parallel and hardwire the cab for 16 ohms (or 4, if that's what you need).
http://www.ebay.co.uk/itm/CLIFF-ELECTRONIC-COMPONENTS-S2SNS-SOCKET-1-4-JACK-UNSWITCHED-2POLE/171118832795?hash=item27d77a2c9b:g:~t4AAOxyoVZTIj~8
Those switching PCBs are responsible for a significant number of blown amp OTs.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Which function do you use, the mono/stereo or the 4/16-ohm? If it's both it makes things more complicated…
Mono/stereo can be done safely using the jack switches since if one fails it still leaves the amp connected to half the speakers. 4/16 ohm can be done with a heavy-duty DPDT switch drilled through the middle of the panel where the slide switch is.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The Neutrik sockets will have exactly the same issue as the original ones - which aren't actually that crap, it's just that passing the speaker current through jack switches - especially on the back of a cab where the cables are likely to get tugged and strain the contacts - is just not a great idea from a reliability point of view.
It would be possible to use two jacks and two DPDT switches to do it all very reliably, but I would have to work out the wiring...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The four contacts on a Speakon are for bi-amping, not switches like they are on a 1/4" jack.
If you do want to use the Speakons, by far the easiest solution is just to wire the cab as two independent 8-ohm pairs, then use two cables from the amp to the cab for mono 4-ohm use, and make a special series cable for mono 16-ohm use if you need that.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein