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PostPosted: Mon Jan 22, 2024 10:34 am 
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Joined: Thu Oct 13, 2016 10:04 am
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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


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PostPosted: Mon Apr 08, 2024 11:43 pm 
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I reduce the power to the 12AX7 channel, the volume drops and distortion starts sooner than it does on the EF86 channel.
only up


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PostPosted: Thu May 23, 2024 2:36 am 
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Joined: Tue May 21, 2024 6:59 pm
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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


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