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Reviews Categories | Electron Tubes | Sovtek / Ryazan 811A Help


Reviews Summary for Sovtek / Ryazan 811A
Sovtek / Ryazan 811A Reviews: 1 Average rating: 5.0/5 MSRP: $(missing—add MSRP)
Description: Thoriated-tungsten-filament type used as AF power amplifier and modulator and as RF power amplifier and oscillator. Requires small four-contact socket and may be operated in vertical position base down or in horizontal position with pins 1 and 4 in vertical plane.
Product is in production.
More info: http://www.vaco.ryazan.ru/HTMLs/oscillating-lamp/SV811A.htm
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VK3BL Rating: 5/5 Feb 11, 2016 02:07 Send this review to a friend
Svetlana 811As by another name  Time owned: 0 to 3 months
Its not well known, but Ryazan was the OEM factory for Svetlana's 811A product. If you look closely, you can even see the Ryazan logo on Svetlana 811A tubes.

The only difference between the NOS Ryazan G-811 tubes and the Svetlana 811As is that Svetlana 'dressed' the tubes up with a ceramic base and a little ceramic insulator on the plate cap; other than that the tubes are exactly the same with the same internals.

Ryazan NOS tubes can be had even cheaper than the Chinese/Shuguang FU-811 ('811A').

After having a 3/4 Shuguang tubes develop cracks in the plates along the bends after 15 hours transmitting time (run within 45 Watts CCS), I decided to explore my options.

I recently purchased a set of 4 from the eBay seller electrikua and couldn't be happier.

Even though they were NOS, the glue on the base and cap plates were fine (unlike the Centron 811As floating about), and they powered up at 1700V idle with no glitches!

I will write a follow up review after more testing has been done, but for now ill ask this:

Why settle for poorly made Shuguang tubes when you can buy 4 Ryazan tubes - exactly the same internally, made at the same plant as Svetlana 811As - for $70 USD? Bargain!

 


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