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Description
Platinum matched pair ECC83 12AX7 EI Yugoslavia Telefunken Long Smooth Plates 17mm NOS NIB rebranded UnitedTwo (2) fully tested NOS tubes, platinum matched pair of rare ECC83 12AX7 EI made in Yugoslavia on genuine Telefunken made tooling machines, rebranded United National. They are real vintage NOS tubes in original boxes made back in late 80s early 90s in EI tube factory in Nis, Serbia. (Elektronska Industrija Nis) If you like sound of Telefunken's smooth plates ECC83 12AX7, you'll like these too, because they are (almost) exact copy. The only
Two (2) fully tested NOS tubes, platinum matched pair of rare ECC83 12AX7 EI made in Yugoslavia on genuine Telefunken made tooling machines, rebranded United National.
They are real vintage NOS tubes in original boxes made back in late 80s - early 90s in EI tube factory in Nis, Serbia. (Elektronska Industrija Nis)
If you like sound of Telefunken's smooth plates ECC83 12AX7, you'll like these too, because they are (almost) exact copy. The only differences are in thickness of halo getter and in "staples" which are facing each other.
I have few 100 pcs boxes of these tubes and I had enough time last few months to carefully measure them on my Metrix and Tesla tube testers for plate currents and Hickok for transconductance and to make platinum matched pairs with balanced triode sections.
You can find them rebranded Telefunken, Philips and Siemens, because all three factories had contracts with EI. These are pre war tubes, with exceptional quality, made with 1st class materials, because of that many of them have been rebranded like long life premium versions E83CC and sold by Siemens and Philips in their boxes.
You can also find them relabeled Telefunken with diamond mark on the bottom last few years! Diamond bottom mark is done on laser machine, and if you want to avoid that and to be sure that you are buying genuine Telefunken ECC83 12AX7, just take a look at getter and how staples are faced. Diamond bottom is not proof any more ...
If you want to know more about Telefunken ECC83 12AX7 and different types of smooth plate and ribbed plate versions you should read this article on my site: www.tubes.rs/ecc83-telefunken-12ax7/
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4.6 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
LOVE ❤️
I’ve only had this for a few days but I am in LOVE with it and maybe a little obsessed.
Even my husband commented on how clean our floors were after the first use. The mapping feature works very well; better than my previous robo vac. I love that it takes the everyday maintenance out of the equation by cleaning/drying the mop heads itself.
I wish the instruction manual had more info in it, as well as what some of the features on the app entail, but I’m sure google can provide that info.
I’m very pleased with this product.
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Reviewed in the United States on November 3, 2025
★★★★★ 5
If it doesn't connect to Wi-Fi do a hard reboot and start download again.
I have had this for 2 days. I could not connect this to my WiFi. I wanted to do a hard reboot but the small pamphlet doesn't explain how, the pamphlet is basically useless. I looked on line and performed it then set it back up. It now works really well as a vacuum. I haven't tried the floor washing yet but the vacuum portion is really very good cleans better than my other older two well known vacuums combined. The other two older robot vacuums I never needed to program to have them vacuum but this one you need too. It won't work without it. It wasn't had to program either.
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Reviewed in the United States on September 30, 2025
★★★★★ 3
Narwal
The mop feature works really well on floor that are bare, it does not do a very good job on vaccuming area rugs and it can not get on top of thicker rugs to vaccum. IF you have bare floor or area rugs that can be easily removed it is great. I love the mop wash mode.
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Reviewed in the United States on August 17, 2025
★★★★★ 5
I'm in love with this thing
A few tweaks in the app and it cleans like a dream . I don't have pets but I have kids and this takes a load off my shoulders , It's pretty quiet , and the mops the whole floor , the battery life is pretty good for multitasking , it lasts all 800 sq ft of the bottom of the house
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Reviewed in the United States on January 17, 2026
★★★★★ 5
Perfect fit, quick fix & vacuum works like new
Number of Items: 1, Style: X10 Pro Omni Accessories Kit, Number of Items: 1, Style: X10 Pro Omni Accessories Kit
The Eufy RoboVac X10 Pro Omni replacement accessories kit fit perfectly-filters, brushes, and mop pads all snapped in without tools. Instructions were clear, and the vacuum’s back to full suction and mop performance. Good quality materials, fair price, quick fix.
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Reviewed in the United States on March 30, 2026