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

@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

aniwolfe thank you very much for the Mullard and Tungsram advice.I will check out the seller on Ebay. Happy listening.

samzx12,

I'm curious with your opinion concerning GL KT88 vs the KT77. I tried the KT120 and found them a bit glaring. I too, like aniwolfe, am using KT77 with Cifte tubes in my PL Dialogue Premium which sound wonderful. I'm using Cifte in the first 4 slots with the stock PL 12au7 in the last 2 slots. 

Keep us updated with the KT88

Ron I need to listen more to get a good grasp on the GL KT88.  So far they are favorable. Great bass control, top end extension is good with no brightness,  mid-range is nice but I'm trying to find the correct 12AU7 combo. The Cifte is in the front two and reissue Tung Sol in the last 4 slots. I am liking it so far and I will say this. I like the GL KT88 better than the KT150. For some reason the bass is fuller and stronger. YMMV but maybe the amp handles the 88 tube design better than the 150? Kind of shocking and I feel I have several hours on the 150 to get a decent feel for them. Maybe they need more time? Not sure how long most people feel they need, but I think with any tube after 25-50 hours one should get a good opinion or feel of the sonic characteristics. 

Just a quick update. I put the stock PL 12AU7 back in the last 4 slots in place of the Tung Sol and prefer the stock tubes. Also replaced the Cifte with NEC Mullard 12AU7 in the front 2 slots. Not sure what to think at this point the NEC have more definition and transparency. In other words more energetic without being bright.  Sill haven't rolled other power tubes yet for comparison.