Has anyone compared K150 tubes and the stock EL34s in Primaluna integrated/amplifiers?

@ samzx12

I have had the Mullard El34 Reissues in the PL Dialogue Prem Int Amp and felt the bass was ok. My biggest issue were cymbals(high freq) sounding rolled off at times. I then ordered the GL Kt77 and felt the treble was excellent and so far the bass is a little bit better, but I still need more break in. I only have about 70hours. Supposedly they need over 100hrs for the bass to appear.

I just recently got Cifte 12au7's. They have over 100hrs on them. I was surprised how smooth they were. I find them to be very musical. I was expecting from everything I read to be a thin, overly revealing type tube. They are not the thickest sounding , but are also not what I would call thin. I feel they are JUST RIGHT.

@ samzx12

Yes from everything I have read the Kt 77’s take 100-200 hrs for the bass to appear. My speakers are Eminent Technolgoy Lft-8b’s.

I’ll trade lush for some more air and separation with the Ciftes so far one my favorite 12au7 in the middle slot. I do like however the Tungsram 12au7 and the NEC Mullards quite a bit also.

@samzx12

The Tungsram have a neutral smooth sound like the Ciftes but more bass and less air.

The NEC Mullard Longplates are more neutral than your classic British Mullard. They were made by NEC in Japan using Mullard parts/tools. Labelled Hewlet Packard. They are really amazing. Some for sale NOS on ebay, seller name I think is Spincards. Very reliable person to do business with. They are probably my favorite 12au7. Great soundstage, nice extension on top and bottom. Mids are glorious