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New KT150 tubes?

Has anyone any experience with these pretty new tubes. There are already one or 2 amps I know of, that use them. The review of one of these amps in a UK magazine suggested they were a little warmer and more natural sounding than the nearly new KT120's

The article also suggested they were a straight swap for KT120 based amps, with no adjustment necessary. They are more than twice the cost of KT120's, but still not too costly compared with NOS tubes. I know changing from KT88's or 90's to 120's. did require some amp modification. I have an ARC reference 75 and might want to try the new tubes at some point, ARC don't seem to have a customer E-mail service, to ask the question
david12

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jmead19
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I purchased a quad of kt150s from uncle kev at upscale.

I've had them in my primaluna prologue premium integrated for about three weeks now, replacing the stock el-34s. Wow! what an upgrade. Finally giving me that deep bass punch; it struck me like I bought a new amp when i dropped the needle on Talking Heads Stop Making Sense. At the same time all the sweet midrange is still there.

Absolutely no issues. The tube cage does need to be removed
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