kitaarpeer
Hey guys.
I know absolutely nothing about electronics. Would it be able to extract and reuse the spring reverb from a blown Marshall 8040? It's out of production, so I cant source the blown bit (the speaker is fine though, just something on the board that blew).
Any help would be much appreciated!
Attila
Dont butcher it .....
here an Idea ! use that "blown" amp as a donor for your personalised all valve amp build, not to sure who the amp builders are in your area are , but there is Karel Mars some where in the western cape , I am sure there are outhers close by
AlanRatcliffe
You can remove the tank if you want, that, the speaker, cabinet and knobs are about the only re-usable things.
bluesman
If you were closer to Bloem, I'd be happy to help you with a valve project. Good advice ids to keep peverything from the blown amp, ya just never know?
Gearhead
Karel is near Paarl, right around the corner from you.
Even being out of production really does not mean the bit that blew is no long available. I'd bet that it is available from more than half a dozen places within 100km from where you stay, plus another half a dozen online stores.
makepeace
This looks like a valvestate amp (hybrid of solid-state and tubes). I haven't checked it out, but it most likely has a valve pre stage with solid-state for the rest of the pre's and the power stage..
Which means... the reverb is probably driven by opamps, which will have most of the components on the main board, so its unlikely that it will be easy to separate the circuit from the main amp circuit.
My first instinct would be to find out what part has blown, and try and replace it and get the whole unit working again. In the likely case that its a passive such as a dry/fried cap in the power supply circuit, it should be cheap and easy to fix, however there are other considerations such as transformers, opamps and transistors that could be screwed, in which case you would have a bit more trouble. it should still be fixable as long as there aren't any pre-programmed micro controllers, as these are hard to come by. don't know the circuit so wouldn't know if this is the case.
If you come to the conclusion that its not viable to fix the whole thing, your best bet, if you really want to get the reverb out of it and into a stand-alone form, would be to check the input and output impedance of the tank and try and adapt a solid-state drive and recovery stage to it. You should be able to find some schems on the net.. But if you end up taking it to a tech, whoever you take it to should know how to handle it. You also need to consider and compare the costs involved in a project like that to buying a production reverb, because you'd pretty much be paying for engineering the unit from scratch, unless you are capable of doing it yourself.
Good luck
