trinityamps.com

Just wondering if any Triwatt owners have installed a Power Scaling, (VVR circuit) on this amp, and how it went?

Thanks,

Wm.

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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http://pdfelectronics.com

+! 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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Great tones come in small glass jars!

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

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"The only problem with being retired is you never get a day off"

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.

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.

I haven't personally tried Power Scaling (VVR) on a Triwatt, but it's an intriguing modification. Power Scaling can be a great way to manage volume and achieve better tone at lower levels, especially for home use or smaller gigs. The Triwatt, with its Hiwatt-inspired design, should retain its character well with VVR. If anyone has tried it, I'd love to hear about your experience and any tips you might have! https://snake.io

Many users found that the VVR circuit allows for better control over their amp's volume, enabling them to achieve retro bowl desirable tones at lower volume levels without sacrificing sound quality.