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New tubes in Rogue M-180 Monoblocks

I understand the M-180s now ship with the KT-120 power tubes, instead of the KT-80. You can also simply replace the KT-80 with the KT-120 if you already own these amps. I'm curious whether anyone has done it and what their impressions are as far as the difference in sound. Is the over $300 upgrade worth it?
actusreus

Showing 4 responses by roscoeiii

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roscoeiii
1,155 posts
 
On the issue of the recommended bias for KT120s, in the Stereo 90, the bias meters are off by 5mA (as stated in the manual), so to bias to Rogue's recommended 40mA, the meter should read 35mA.
roscoeiii's avatar
roscoeiii
1,155 posts
 
From what I have read about KT-120s in Rogue amps, the KT120s seem to get pretty universal praise.

Note that some Rogue amps need some modification in order to run KT120s. Best to confirm that your Rogue can use these tubes.
roscoeiii's avatar
roscoeiii
1,155 posts
 
As I mentioned, the bias meter on the Stereo 90 reads 5mA low. As is stated in the Stereo 90 manual. I don't know about the other Rogue models. But for the Stereo 90, when the meter reads 35mA, the actual value is 40mA. And an actual value of 40mA is also what I was recommended by Rogue.

Other people with KT120 tubes have recommended a higher bias than this.
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roscoeiii
1,155 posts
 
Dhcod,

Are these tubes KT120s?
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