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PostPosted: Thu Jul 12, 2012 4:39 pm 
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Location: DFW, Texas
Just wondering if any Triwatt owners have installed a Power Scaling, (VVR circuit) on this amp, and how it went?

Thanks,

Wm.


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PostPosted: Thu Jul 12, 2012 4:49 pm 
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The Triwatt has a pretty effective MV so there isn't much need for a VRM (VVR).

A VRM (VVR) will also be tricky because the bias voltage will have to be scaled along with the B+.

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PostPosted: Sat Jul 14, 2012 4:10 pm 
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+! to kurtlives' comments.

Basically, the VRM/power scaling concept doesn't really work well with Hiwatt type amps. These aren't Marshalls. When developing the Triwatt, which is based very closely on classic Hiwatt designs, it became very clear that there was a specific voltage sweet spot for the right classic Hiwatt tone. If you went much above that, it started to sound shrill. If you went below, it got mushy and lost definition. Just use the built-in MV. If you wanted to add anything to that, you could also install a post-PI MV, which a few folks have tried with regular Hiwatts and appeared to work well.

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PostPosted: Sun May 17, 2020 9:28 pm 
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zaphod wrote:
+! to kurtlives' comments.

Basically, the VRM/power scaling concept doesn't really work well with Hiwatt type amps. These aren't Marshalls. When developing the Triwatt, which is based very closely on classic Hiwatt designs, it became very clear that there was a specific voltage sweet spot for the right classic Hiwatt tone. If you went much above that, it started to sound shrill. If you went below, it got mushy and lost definition. Just use the built-in MV. If you wanted to add anything to that, you could also install a post-PI MV, which a few folks have tried with regular Hiwatts and appeared to work well.

Sorry, just thought Zaphod's comment about the a MV after the phase inverter might work. :oops:

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