From a lot of 100, you can get a good selection of such quads. So a good dealer separates the bad from the good, and offer the good ones to his loyal customers, with fine matching data. This makes them very suited for professional sellers that have really good equipment. Unclear matching, and not enough burn in. So what leaves the factory, is a strange mix of mainly good tubes, and a few bad ones amongst them. They get away with that, and they know it. These seem to have the best price / performance ratio, but the Chinese mix a few bad tubes under the good, always. Number3: The most realistic good choice: Chinese KT88. So my number #2 choice here is the original WINGED-C Svetlana. So the C-Logo is the proof for genuine tubes from St. Petersburg' may only be used if made there indeed. Just the C-logo, new Sensor did not get under their control. In fact Svetlana Petersburg sued New Sensor for this, and the result was some kind of arrangement. your hunt may be successful.Keep apart the Winged-C Svetlana which are the ones made by Svetlana, and the S-LOGO not made by Svetlana at all, by made by REFLEKTOR and sold by NEW SENSOR. And typically not buy it on Ebay without return option. I would say, this is something to buy only from reliable professionals. Be careful with used tubes of this kind, because prices are still very high, but a great brand will not protect you from being sold tubes at the end of life. The holy grail of course, not available, and no realistic solution for that reason. As you can blindly trust most other data, such as leakage etc. NOS with good test data, which is all you need. So what is good is good, and what is bad is bad, I just say it here. Please excuse me for being a bit direct, but I do not want to contribute to any fairy tales and other kind of obscure stories. ![]() What follows is only my personal opinion, from selling tubes since the last 25 years. They were fine when I received them, but sometimes tubes can be on stock for a few years, and I had several that developed gas. ![]() Problem with NEW SENSOR tubes, was for me, they develop gas on stock. For the half the price you have Electro Harmonix by NEW SENSOR, and to me they seem identical. So I do not recommend the expensive GOLDEN LION tubes, sold by NEW SENSOR. Also, the quality of New Sensor doesn't even close. The Golden Lion tubes made by new Sensor have nothing to do with the originals, made by the MO Valve company. You can think of this what you want, and you should. The GOLDEN LION tubes, sold by NEW SENSOR, are made in the Reflektor factory in Saratov Russia, and inside I see the plain old Electro Harmonix construction, as they used always, which resembles their 6L6 optically. They do not use the original tools, neither are their new tools copies of the original tools. NEW SENSOR in New York today owns the brand rights of the 'GOLD LION' brand. The M-OV or MOV Valve company does not existing anymore. As you know, tubes are consumable and need to be replaced from time to time, NOS tubes run out and at that stage you are left with what is being produced today, so one might as well look at what is considered good in 2020 > The main reason for looking at new production is that generally speaking it should be the same or even better than NOS, but mostly, I/we can collect them for use in the future. ![]() I have collected source links at the bottom of the page. Using older brands as a reference is fine since does older tubes is what started it all. NOS tubes of yesteryear (besides reference) has to be left on the sideline. The former focuses more on keeping the cost relatively low yet maintain a "representative" sound profile and build quality, while the later focuses more on absolute premium in both aspects, also here, the cost is of less value. Locate or establish a high quality budget friendly KT88 ( B) or a premium KT88 ( P) which is in production (very important).
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