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PostPosted: Thu Jul 12, 2012 4:39 pm 
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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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PostPosted: Wed Nov 01, 2023 10:09 pm 
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Power Scaling Kits from KOC / London Power have considered many of the difficulties discussed here. In order to maintain tone at lower volumes, KOC employs a bias tracking circuit that may be adjusted for a "fat" bias.
snake io
The London Power circuit is set up between the caps and the OT center tap, caps and screens, etc., which is what I find appealing about it. Because of this, you may instantaneously disable power scaling for a clean channel or assign varying degrees of power scaling to distinct OD channels. This results in instantaneous voltage changes.


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PostPosted: Mon Jan 22, 2024 10:07 pm 
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Reaching out to the manufacturer directly or checking their official forums or support channels might immaculate grid provide insights or recommendations regarding modifications for the Triwatt amp.


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