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Old 21st August 2015, 01:50 PM   #1
Junm is offline Junm  Philippines
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Default 2K2M Tubes...any use?

I have several pieces of this GOLDEN TUBES... Looking at Google It only reveal this design... http://www.anc-tv.ne.jp/~suzuki3/amp_at20/image2.gif
and the Rodina Radio...

Did anybody use this tube in their hi-fi amp or preamp? I want to see any triode curve or any audio application?
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Old 23rd August 2015, 02:23 PM   #2
Junm is offline Junm  Philippines
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120 views but seems no one know about this tube...to our russian tube guys....anybody has the triode curved please??
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Old 23rd August 2015, 02:35 PM   #3
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Here you go

http://frank.pocnet.net/short/054/1/177.pdf

It is a vari-mu pentode so unless you trace the triode strapped curves to find a linear region they wont have much use in audio.

If you want some numbers, using RDH4 triode connection estimates, mu should be around 8, gm 1ma/V and rp 8k. All the same these numbers are useless since it is a vari-mu tube.
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Old 23rd August 2015, 03:30 PM   #4
mike567 is offline mike567  United States
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drive the suppression grids positive and it may be of use. schematic shows 53 volts+
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Old 23rd August 2015, 05:33 PM   #5
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Quote:
Originally Posted by mike567 View Post
drive the suppression grids positive and it may be of use. schematic shows 53 volts+
Suppressor grid is tied to the cathode (filament in this case). If you mean screen grid that would just mean operating the tube in pentode mode.
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Old 24th August 2015, 02:59 PM   #6
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Variable-Mu types--Only good for Radio Sets really.
--Used in IF Strips...
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Old 24th August 2015, 03:04 PM   #7
Junm is offline Junm  Philippines
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Quote:
Originally Posted by marcelop View Post
Here you go

http://frank.pocnet.net/short/054/1/177.pdf

It is a vari-mu pentode so unless you trace the triode strapped curves to find a linear region they wont have much use in audio.

If you want some numbers, using RDH4 triode connection estimates, mu should be around 8, gm 1ma/V and rp 8k. All the same these numbers are useless since it is a vari-mu tube.
If they are Vari Mu pentodes why they are used in early russian radios as pre and output tubes like this ones from GTubes,com
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Old 24th August 2015, 03:19 PM   #8
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Originally Posted by Junm View Post
If they are Vari Mu pentodes why they are used in early russian radios as pre and output tubes like this ones from GTubes,com

The are used as tuned RF amps if I´m not mistaken, nothing to do with audio. The output tubes aren´t actually 2k2m tubes but 2j2m (2Ж2М).

The fact that they are vari-mu doesn´t mean you cant use them in audio, just dont expect to swing their grid 2V without generating massive 2nd harmonic distortion. In a guitar amp it might be quite okay, who knows.
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