trinityamps.com

I recently installed the VRM module in my TC15, as per the instructions, full power supply regulation.
I am very happy with the results; makes the amp much more versatile for home use.
I do have one observation, and want to check if this is normal.

I have noticed that the 12AX7 channel responds more dramatically to the power reduction than the EF86 channel, in terms of drop in volume and faster onset of distortion.
I assume this is because the EF86 channel only has a single preamp gain stage being down-regulated compared to the four 12AX7 stages being down-regulated.
Has anyone else observed this?

thanks
Mark

I reduce the power to the 12AX7 channel, the volume drops and distortion starts sooner than it does on the EF86 channel.
only up

This is because the VRM affects each preamp gain stage, and with the 12AX7 channel having more stages, the cumulative effect is greater. The EF86 channel's single gain stage means it's less affected by the same amount of voltage reduction. This is consistent with discussions and observations shared by users on forums.

block blast

The VRM allows for greater control over the amp's behavior at different volumes, making it versatile for achieving various tones from clean to overdriven at manageable sound levels.
geometry dash

Hi Mark! Your observation is spot on. The 12AX7 channel responds more dramatically to power reduction because it has multiple gain stages, while the EF86 has only one. This difference is normal. If you want to balance the channels, consider experimenting with different tubes or adjusting the gain in the EF86 channel. Enjoy your amp!


level devil