2Channel H difference between 2011-2013?

[nicolasrivera]

Its seems the H model has had some revisions over the years and i was wondering if anyone knows what are the main differences from a 2011 to a 2013 production model.

Thank you.

 

[Deleted member 5962]

Looks like only PRS knows. Maybe they'll chime in

 

[László]

Here's what the esteemed amp guru Em7 had to say about it in a thread here, back in 2012 (I googled your question):

"There have been many revisions to the 2-Channel “H” to reduce noise and/or improve performance. My amp is a first generation pre-phase inverter master volume 2-Channel "H" (a.k.a. Rev. B). Earlier 2-Channel "H" amps had a master volume that was located after the phase inverter. For those who are curious, a phase inverter is a circuit that takes a signal as input and outputs an in-phase signal plus a signal that is 180-degrees out of phase with the input signal (i.e., a mirror image of the input signal). A phase inverter is necessary when coupling a preamplifier to a push-pull power stage. A phase inverter may or may not provide signal gain. A post-phase inverter master volume takes advantage of signal gain within a phase inverter circuit (usually a circuit known as a “Schmitt splitter”) to add an additional gain stage that can be overdriven before the master volume. Phase inverter distortion is a big component of the classic “dimed” Marshall tone."

 

[nicolasrivera]

Here's what the esteemed amp guru Em7 had to say about it in a thread here, back in 2012 (I googled your question):

"There have been many revisions to the 2-Channel “H” to reduce noise and/or improve performance. My amp is a first generation pre-phase inverter master volume 2-Channel "H" (a.k.a. Rev. B). Earlier 2-Channel "H" amps had a master volume that was located after the phase inverter. For those who are curious, a phase inverter is a circuit that takes a signal as input and outputs an in-phase signal plus a signal that is 180-degrees out of phase with the input signal (i.e., a mirror image of the input signal). A phase inverter is necessary when coupling a preamplifier to a push-pull power stage. A phase inverter may or may not provide signal gain. A post-phase inverter master volume takes advantage of signal gain within a phase inverter circuit (usually a circuit known as a “Schmitt splitter”) to add an additional gain stage that can be overdriven before the master volume. Phase inverter distortion is a big component of the classic “dimed” Marshall tone."

Thanks, yes i read that prior to posting this thread, but wanted to know further details of if this change in the PI was the only thing changed, but when? what years was this change made? stuff like that.

From the PRS videos of PAul in his studios i seem to like more the sound of the H the the "new" Custom evolution.

Thanks for the help, hope i can gather more info before calling customer service.

 

[László]

I've found Doug Sewell and his crew to be very helpful in sorting this stuff out. I'm guessing if you email customer service, they'll update the info.