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Description
Platinum matched pair DF91 RTC NOS NIB rare old inclined square getter 1T4Brand: RTC Type: DF91 Country of Manufacture: France Auction is for two tubes (platinum matched pair) of rare DF91 RTC 1T4 old type battery type pentode used in many tube amplifiers, preamplifiers and radio sets. They are in original boxes, the same batch numbers and construction. Old type, great sounding DF91 1T4, one of the best together with Philips D getter and Telefunken. They are nicely and carefully matched from big batch on calibrated Metrix
Brand: RTC
Type: DF91
Country of Manufacture: France
Auction is for two tubes (platinum matched pair) of rare DF91 RTC 1T4 old type battery type pentode used in many tube amplifiers, preamplifiers and radio sets.They are in original boxes, the same batch numbers and construction. Old type, great sounding DF91 / 1T4, one of the best together with Philips D getter and Telefunken. They are nicely and carefully matched from big batch on calibrated Metrix U61B tester.
Great choice for Analogue Squared Paper Amps.
Registered airmail shipping.
If you buy any item on ebay from me and for if you are not fully satisfied for any reason or have any complains, please send me message before leaving negative or neutral feedback or opening a case. I really do care about your satisfaction and I’ll do my best to solve any kind of problem.
I collect tubes and tube gear for more then 30 years and I start to sell recently, please be sure to check my other items and visit my store for more rare NOS tubes and parts.
I have more than 200000 NOS tubes in stock and just small part is listed here, if you are interested in any specific tube or part, please send me message.
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4.4 ★★★★★
Based on 2130 reviews
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Product Reviews
★★★★★ 5
Vivid color and a wonderful audio sound!
Size: 24
Wow. With this price, the color quality of this monitor is amazing. Most surprising part is the speaker! The sound is so nice! My son use it to link his Chromebook to goto YouTube and enjoy to classic music played by Berlin philharmonic, wow!!! This is really a wonderful monitor!! Really a great product.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Nice monitor great value
Size: 24
I liked this so much I got 2. Nice size for a monitor, looks good, works good. No sound, camera or mic, so I bought a speaker and camera on Amazon too.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
A quality product
Size: 22
great picture quality
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Reviewed in the United States on June 9, 2026
★★★★★ 5
Koorui 34E6UC (34" 3440×1440, 180 Hz, 1000R curved VA panel) — But Missing Info Buyers Should Know
Size: 34"/WQHD/1000R/HDR400
Review:
I purchased two of the Koorui 34‑inch curved ultrawide monitors for a dual‑monitor setup, and so far I’m very pleased with them. The picture quality is sharp, the brightness is solid, and the “Normal” color preset looks natural without any adjustments. For the price, these 34‑inch panels deliver very good performance.
That said, there are a few important details the product listing and reviews don’t mention — and knowing them ahead of time would have saved me some stress during installation.
1. YES, the 34‑inch model DOES include stand‑offs (spacers)
This is not mentioned anywhere in the listing, and even Amazon’s Rufus incorrectly says they are *not* included. They actually come in the small accessory packet with the manual.
If you’re mounting these monitors, you will need those stand‑offs because of the recessed VESA pattern. They are already in the box — just not advertised. I rushed to order a separate spacer kit because the listing didn’t mention it, so I’m putting this here to help the next person avoid that.
2. One of my monitors flashed briefly until I disabled FreeSync
On one of the two monitors, I noticed a quick bright “flash” when moving the mouse. Turning off Adaptive Sync / FreeSync in the monitor’s menu fixed it instantly. The other monitor didn’t have this issue, so it seems to vary by panel.
Not a defect — just something to be aware of if you see flicker or brightness pops.
3. Color and brightness match well once set manually
After setting both monitors to the same brightness, contrast, and color mode, they match very well side‑by‑side. The “Normal” color preset looks the most accurate on these VA panels.
4. Build quality and packaging are solid
Both monitors arrived well‑protected, and the included cables work fine. The stand is basic, but I’m using monitor arms, so that wasn’t a factor for me.
5. Too early to comment on long‑term support or durability
I’ve only had these monitors set up for a few hours, so I can’t speak yet to long‑term reliability or how responsive Koorui’s support is. I’ll update this review if anything changes over time.
Bottom line:
These 34‑inch Koorui ultrawides are excellent for the price, especially for gaming or a dual‑monitor setup. Just be aware that:
- Stand‑offs ARE included (despite the listing not saying so)
- FreeSync may need to be turned off on some units
- Picture quality is great once you match settings manually
- Long‑term support is still unknown
If the listing had mentioned the included spacers, it would have saved me a last‑minute order — so I hope this review helps the next person.
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Awesome monitor! (my 3 year review)
So I've owned this monitor for about 3 years now and here's what I have to say about this monitor. The picture quality is actually really good. I got the 1080p version and I mostly use it with my Xbox series x and occasionally will use it for some lighter gaming on my gaming PC both work effortlessly well. The screen size is okay I think next time if it's in the budget I'll buy there 34 inch curved monitor. But for right now I'm sticking with this monitor until it dies and so far it's running strong 3 years later. Right now this monitor cost $80 which is an absolute steal at that price. I paid $130 for it and would say it's absolutely worth getting. There's no flickering. The setup process went smoothly. It's compatible with both my console and gaming PC! I absolutely love this monitor! I don't own the 27 inch version but I'd recommend going with either that size or bigger if you can afford it.
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Reviewed in the United States on December 10, 2025