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In Reply to: RE: A tube journey with lesson learned, Re; KT88 & KT150 posted by Mr_bill2 on January 19, 2024 at 09:37:25
i can not confirm your impression. my lyric Ti 140 can handle KT150 and i tried them critically again and again but never was satisfied with their bass performance which was lacking and sluggish to my ears.
may be your amp has a more sophisticated circuit supporting KT150 perfectly.
Bias not only affects power-tube performance, but it can also impact the sound and the lifespan of said tubes. As already mentioned, if the bias voltage isn't negative enough, then the tubes will run hot. This is sometimes referred to as "biased hot," "red plating," or "running hot," and it not only significantly shortens tube life but can also result in a lack of output power and punch. On the other side of the coin, if the bias voltage is too negative (a.k.a. "biased cold" or "running cold") the amp will sound dull and lifeless, and some unwanted and unpleasant-sounding crossover distortion could well occur — and, much as we guitarists love distortion, this type sucks!
So, just like the idle on a car, the correct bias-voltage setting on your amp is imperative for performance, tone, and tube life. Thanks for playing your wisdom and way with words forward,
Very nice integrated amp, made in Germany. What speakers are you running? What output tubes have you gone to, KT88 or maybe TS KT170 used in the Ti 100 MKII?
The QS V4s before being discontinued had a cycle refresh with upgraded transformers that were suitable for a wide range of output tubes, from the el34 to the kt150. So yes they had the correct voltage to handle and maximize the kt150 tube. Before the change he had like 300 screen v. Not enough to push the kt150s which do much better around 600 v.
You are incorrect in assuming the plate voltage on the V4s changed from 300vdc to 600vdc. The screen grids are at 300 vdc.
Yes, correction. Screen voltage.
Are the newest version still 300 screen v? Now disconnected.
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