Quote from: awdman on October 09, 2009, 10:46:17 PM
is this the schematic? http://schematicheaven.com/boogieamps/boogie_vtwin.pdf
Hi awdman,
Yes! that is the schematic I based my ideas on.
It is a most intelligent way to intergrate Valves with opamps.
Here is a rough circuit drawn from memory of how I built mine,,, bare in mind this was many years ago but might help you to come to a better understanding of how to go about such things.
Note the mistake on Vtwin drawing; *R24-270k* around U1b is *Wrong* 27k will make it much more civilised.
I did not use all the addon bits just the clean section thru the tone and onto the pwramp output.
I've moved on from this stuff as I've found that it is better to throw money and time at the business end of an amp,, ie, A Tube Poweramp is more useful as that is the one thing SS can't do to well.
Having said that, a Valve preamp circuit like this will certainly improve a SSAmp.
I can't stress enough that any *One off* ciruit like this you really need to spend a lot of time breadboarding it all *RD FIRST*,,,Then build,, Otherwise there is a good chance you are just adding to the land fill.
Have fun, Phil.