Extracting the overdrive channel from a multi-channel amp.

[Ken Moon]

Chris, I hate to be harsh, but if your friend is a business person, he will know that he doesn't HAVE TO spend a lot of money trying to make an amp that nobody is in love with, just because he bought the company.

Hopefully, he got something other than this amp "design" for whatever he spent.

But those are sunk costs now, water under the bridge, yesterday's news. What matters now is how he proceeds towards his business goal, which seems to be to make and sell a simple, hi-gain amp he can build himself.

I can absolutely guarantee that there are at least a dozen guys on this board who could talk with your friend, recommend some videos and recordings, and help him define exactly what he wants from his new amp.

This should lead to a written Specification, so he has somewhere to start. Of course, changes and refinements will be made as needed, but without a design baseline, he will just be wandering aimlessly in the desert, searching for his happy place.

Once he knows what he wants, the circuit design becomes (I hate to say it this way but it's true) almost trivial. Then he can move on to the other trivial details, like cosmetics, parts sourcing, marketing, pricing, in- and out-of-warranty service, financing, etc.etc.etc...

Best of luck to your friend,

Ken

[roberto]

8% of the incomes of the company must be devolved to TAG.

[roberto]

Back home. Looked at the schematic.
It's at 99.9% a Marshall DSL.
Start from it.

Please, 8% to TAG plus 4% to me.

[Smokebreak]

Nice, Roberto

The only thing I can't understand is the lack of attenuation between stages 2>3, in 5 stage mode. DSL has 470K/470K divider there. What is the Q2 circuit there?

[John_P_WI]

Channel mute / anti-pop.

[Smokebreak]

Ok I see, signal gets grounded there. Well that means, as far as attenuation goes, there is only 1M to ground between coupler and 21K worth of series resistamce to 3rd stage grid. On paper, I would think that would be a mess, no ?

[mrbadwr3nch]

Chris, I hate to be harsh, but if your friend is a business person, he will know that he doesn't HAVE TO spend a lot of money trying to make an amp that nobody is in love with, just because he bought the company.

Hopefully, he got something other than this amp "design" for whatever he spent.

But those are sunk costs now, water under the bridge, yesterday's news. What matters now is how he proceeds towards his business goal, which seems to be to make and sell a simple, hi-gain amp he can build himself.

I can absolutely guarantee that there are at least a dozen guys on this board who could talk with your friend, recommend some videos and recordings, and help him define exactly what he wants from his new amp.

This should lead to a written Specification, so he has somewhere to start. Of course, changes and refinements will be made as needed, but without a design baseline, he will just be wandering aimlessly in the desert, searching for his happy place.

Once he knows what he wants, the circuit design becomes (I hate to say it this way but it's true) almost trivial. Then he can move on to the other trivial details, like cosmetics, parts sourcing, marketing, pricing, in- and out-of-warranty service, financing, etc.etc.etc...

Best of luck to your friend,

Ken

You're not being harsh Ken, just honest. The more I look at it and after reading what Roberto wrote about it being a DSL, the worse this amp looks.

I'm just going to put him on this thread and then we can all find out how dead set he is on redesigning this particular amp.

I don't know what all he got in the purchase, but looking at the website, it appears that there are a couple of guys that are into this amp and there are seven other guitar amps, three bass amps, etc. whatever.

I'll let you guys talk him out of monkeying with this thing. I've got my own stuff to build

[mrbadwr3nch]

Alright, apparently there's a few versions of this head. This one is a DSL copy.

I think I talked him into getting on the forum and found out he is not opposed to starting from scratch to build the simple hand-wired high gain unit.

We'll see if he gets on.

[ToneMerc]

Chris, I hate to be harsh, but if your friend is a business person, he will know that he doesn't HAVE TO spend a lot of money trying to make an amp that nobody is in love with, just because he bought the company.

Hopefully, he got something other than this amp "design" for whatever he spent.

But those are sunk costs now, water under the bridge, yesterday's news. What matters now is how he proceeds towards his business goal, which seems to be to make and sell a simple, hi-gain amp he can build himself.

I can absolutely guarantee that there are at least a dozen guys on this board who could talk with your friend, recommend some videos and recordings, and help him define exactly what he wants from his new amp.

This should lead to a written Specification, so he has somewhere to start. Of course, changes and refinements will be made as needed, but without a design baseline, he will just be wandering aimlessly in the desert, searching for his happy place.

Once he knows what he wants, the circuit design becomes (I hate to say it this way but it's true) almost trivial. Then he can move on to the other trivial details, like cosmetics, parts sourcing, marketing, pricing, in- and out-of-warranty service, financing, etc.etc.etc...

Best of luck to your friend,

Ken

You're not being harsh Ken, just honest. The more I look at it and after reading what Roberto wrote about it being a DSL, the worse this amp looks.

I'm just going to put him on this thread and then we can all find out how dead set he is on redesigning this particular amp.

I don't know what all he got in the purchase, but looking at the website, it appears that there are a couple of guys that are into this amp and there are seven other guitar amps, three bass amps, etc. whatever.

I'll let you guys talk him out of monkeying with this thing. I've got my own stuff to build

So 3 pages later, its determined this amp is nothing more than a Marshall DSL circuit.....nothingelse to see here folks!




TM