A real one here:
Notice the shielded cable,, twisted heater wire, Shield around input socket, Coax used for tone pots, and intereconect points, large distance between sensitive components.
http://forum.metroamp.com/viewtopic.php?f=3&t=23078
Also From Roccoforte Amps own site; Click on optional extras ,,, note the $200 fee for DC heaters. Trust me you need it.
BTW your signal without hi imp buffer will be roughly 7 times SMALLER assuming the TDA input Z is say 20/30k with a good chance of bass loss.
The preamp was built for looking into a Hi imp Not a low one.
Yes the tone still works but nowhere near as good as it should.
Just thought I would mention it and YES I did go to the trouble of simulating it before I opened my mouth.
No it's not a TW amp but the *idea* of 10k cathode R on V3 comes from TW,,
It forces half wave clipping which enhances the Power tubes as they go into compression but on it's own into a super clean SS poweramp,,, I doubt it's worth/usefulness. A preamp of triodes does not maketh the Tube sound,,
That comes from the power tubes.
Without power tubes being compressed via the big signal swing from the triodes (which I should add is comparitively clean cept for some half wave clipping) then it won't distort like an all valve amp.
My guess is a bit of half wave rattle which is way to big for the opamp/poweramp input and the power chip is just slamming into the rails which will be distorting and MAY?? sound ok I guess.
From my own experience I'd go with one Ax7 unless you have a tube power stage.
Your setup has a 300 volt supply and those triodes won't do much distorting on there own you need to use diodes if you want triodes to distort like a PP pentode output stage. Or consider the SiAB (Stack in a box) concept as it is more suited for running into SS.
Even if you fix the ground problems your board has to many tracks to close together.
If you want heater tracks pull them all down to one side of the PCB Away from everthing else.
To generalise; You can't take the front end from an All Valve Amp design and just plug it into a SSpower Amp and expect it to sound even remotely like a Roccaforte.
I respect your commitment to your idea but I'm just hinting that it might be the wrong way to do it,,,Just my say,, best of luck with it. Phil.
Notice the shielded cable,, twisted heater wire, Shield around input socket, Coax used for tone pots, and intereconect points, large distance between sensitive components.
http://forum.metroamp.com/viewtopic.php?f=3&t=23078
Also From Roccoforte Amps own site; Click on optional extras ,,, note the $200 fee for DC heaters. Trust me you need it.
BTW your signal without hi imp buffer will be roughly 7 times SMALLER assuming the TDA input Z is say 20/30k with a good chance of bass loss.
The preamp was built for looking into a Hi imp Not a low one.
Yes the tone still works but nowhere near as good as it should.
Just thought I would mention it and YES I did go to the trouble of simulating it before I opened my mouth.
No it's not a TW amp but the *idea* of 10k cathode R on V3 comes from TW,,
It forces half wave clipping which enhances the Power tubes as they go into compression but on it's own into a super clean SS poweramp,,, I doubt it's worth/usefulness. A preamp of triodes does not maketh the Tube sound,,
That comes from the power tubes.
Without power tubes being compressed via the big signal swing from the triodes (which I should add is comparitively clean cept for some half wave clipping) then it won't distort like an all valve amp.
My guess is a bit of half wave rattle which is way to big for the opamp/poweramp input and the power chip is just slamming into the rails which will be distorting and MAY?? sound ok I guess.
From my own experience I'd go with one Ax7 unless you have a tube power stage.
Your setup has a 300 volt supply and those triodes won't do much distorting on there own you need to use diodes if you want triodes to distort like a PP pentode output stage. Or consider the SiAB (Stack in a box) concept as it is more suited for running into SS.
Even if you fix the ground problems your board has to many tracks to close together.
If you want heater tracks pull them all down to one side of the PCB Away from everthing else.
To generalise; You can't take the front end from an All Valve Amp design and just plug it into a SSpower Amp and expect it to sound even remotely like a Roccaforte.
I respect your commitment to your idea but I'm just hinting that it might be the wrong way to do it,,,Just my say,, best of luck with it. Phil.