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Old 13th February 2011, 11:53 AM   #1
Trout is offline Trout  United States
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Default New Tube Manufacture?

I just saw this on another forum and thought I would check in here to see if anyone has heard anything about these.

Data Sheet for the 12AX7KVA

They also make a new 6EU7.
I could not find an English version of the site, but most web site translators work ok.

voshod
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Old 13th February 2011, 12:42 PM   #2
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Voskhod, isn't that where Electro Harmonix tubes are made?
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Old 13th February 2011, 12:56 PM   #3
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As far as I can tell EH/Sovtek/New Sensor or any of their 50 other assumed brands all come from St. Petersburg, Saratov, and Novosibirsk
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Old 13th February 2011, 02:17 PM   #4
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Yes, Voskhod make the standard Russian 6Н2П-ЕВ and related designs, which are used as ECC83/12AX7 substitutes. I believe they have been sold as Sovtek, or other New Sensor brands in the past. The old Sovtek 12AX7WA looks just like a Voskhod 6Н2П inside.

The 12AX7EH is much different, and looks like a real 12AX7.
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Old 13th February 2011, 03:32 PM   #5
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So would anyone know if the Sovtek 12AX7WA sounds different compared to the Electro Harmonix 12AX7EH ?
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Old 13th February 2011, 03:36 PM   #6
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Very Different, in guitar amps, at least.

The -WA has a weaker sound. -EH sounds more like ECC83
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Old 14th February 2011, 05:05 PM   #7
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Old 14th February 2011, 06:19 PM   #8
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I read an article in Audio Express a couple of years ago about a new Mullard 12AX7 design that has much wider bandwidth due to vastly reduced Miller capacitances. Has anyone tried this tube yet?
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Old 14th February 2011, 06:23 PM   #9
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That was the claim. We'll never know- the venture went belly up before it really got started.
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Old 14th February 2011, 07:01 PM   #10
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It is Voskhod's version of 12AX7, made from 6N2P with dark color of anodes and re-wired filaments.

Chinese 12AX7-B are similar.

Voskhod is Калужский Радиоламповый Завод (Kaluga town Radio Tube Plant)
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