I'm an owner of a small manufacturing company in Central Illinois. We are making audio equipmnet. Currently, we are putting in production a new Mono Block 100W Power Tube Amplifier. We have purchased a pair of these brand new tubes for the very first amplifier we have built. One of the tubes had an intenal short and started a fire. It destroyed the PCB and magnetized the output transformer due to excessive current. I believe that there are two problems with this situation. Number one is a very poor quality of these tubes. The GM of the tested pair was just 4200. According to the tube spec it should be at least 6000 or better. It indicates to me that the tube is not manufacturing to the min spec. Second, the tubes before they are sold to the customers should undergo a test at Antique Electronics. I would not recommend to buy tubes made by this company and from Antique Electronics as well.

I would like to add that my over all experience with tubesandmore.com was exceptional. From the easy to navigate website, to the purchase process and to the fast delivery. This is a business model for others the envy.

I purchased these after one of the Gold Lion reissue's failed in my Willsenton R8. I put in the the original Willsenton KT 88s and all was ok and sounded good but I wanted something better so I tried these. The Psvane's were carefully biased and listened to for hours and several times often over the next few days. I like to listen to all types of music, the Psvane's bass was good, sound stage ok and they had a good upper extension not really bright but ok. The mids were just barely ok but the really bad thing is they are really harsh, and with most vocals, especially female they would get really muddy.

I was running a pair of KT-88 Gold Lions in my DIY Dyna MKiii clones and one of them gave up the ghost. Instead of buying one tube I wanted to get another matched pair but after seeing how much they had increased in price since my original purchase, I decided to give the Psvane a try at half the price. I was surprised at how well they sounded right out of the box. I ran them against my other MKIII clone that still had the Gold Lions in them. I really couldn't tell that much if any difference. I decided to purchase a second pair of Psvane KT-88's for the second amp. I've got about 30 hours on them and I'm very well pleased. I just adjusted the bias so I'm anxious to see how they continue to perform.

As a benchmark for this review I am using the Tung-sol 6550 (new sensor) which with the current state of affairs are unavailable in the USA. I purchased a balanced quad of the KT-88C as a backup to the Tung-sols. There is also another designation of Psvane KT-88 without the C. From the photos they look identical to these but I could not find any specific information as to their differences, if any. Now, I am using these in a Black Ice F-22 which comes with its own bias meter (mA meter). Thus, I can constantly observe the state of each of the output tubes individually and from their drift ascertain their condition. First observation is that these tubes come with minimal burn-in as it took around 100 hours of adjusting the drifting bias for them to finally settle in. In my case that was not too much trouble as I had the built-in meter and I could readily check the bias. But I am not sure it would be optimal for the amps where biasing is only done once at the beginning as by the time they settle in the drift will mean that they may operating out of spec. In terms of size these bottles are big so make sure you have enough space around your sockets. One more thing I noticed with these tubes vs. the Tung-sols is that they run much hotter, I had to crank up the bias to get them to their operating specs. And finally, in terms of sound these tubes have an adequate low end (bass) and the highs I guess are ok to my ears (which tap out at around 16KHz) but I personally found the middles lacking. When I plugged the Tung-sols back in the system, the mids where more spacious and less muddled and the bass was in par. In conclusion, you cannot beat the price for these tubes if you absolutely need to get the job done but you get what you pay for.

BOUGHT A QUARTET OF THE KT88C'S TUBES and i was really surprised at the similarity of sound quality to none other than the rare now, svetlana 6550c from the st. Petersburg factory that i believe closed down or caught on fire or whatever in 2012. What was not expected, was the detail in the bass notes with fullness Maybe the chinese psvane people are turning things around! HIGHLY RECOMMENDED.