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Old 11th November 2011, 08:40 PM   #1
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Default What mean those russian electronic units ?

I was looking at this interresting schematic but I have a problem with some units :

Click the image to open in full size.

Is 6ГH just mean 6H ( 6 Henry ) ?

The C1 and Ck capacitors seem to be unpolarised, not electrolytics like usual ... 68000Mk and 2200Mk ...

Did somebody know what mean this mysterious "Mk" capacitor unit ???

PicoFarad, NanoFarad ???

Alain.


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Old 11th November 2011, 08:47 PM   #2
GloBug is offline GloBug  Canada
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The MK(phi) is Russian for MKF, which stands for uF. I think.
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Old 11th November 2011, 09:32 PM   #3
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Quote:
Originally Posted by GloBug View Post
The MK(phi) is Russian for MKF, which stands for uF. I think.
I don't think so because the filter electrolytic capacitors unit are already in "uF" on the schematic but the bypass unpolarised capacitors have the "Mk" unit ... Why ???

Also, 68000uF and 2200uF seem to be very high values for cathode bypass capacitors and they can't be paper or film capacitor (unless they are big like a garbage can) ...

Alain,
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Old 11th November 2011, 09:42 PM   #4
GloBug is offline GloBug  Canada
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Why not email and ask him?

Use google translate if needed.

My first guess was this : Metallized Plastic Film Dielectric (Self healing type)
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Old 11th November 2011, 09:46 PM   #5
Zen Mod is offline Zen Mod  Serbia
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considering needed values , those are certainly microfarads ; even if 68mF at first cathode is sorta highish in value

what's puzzling me , and what's usually sign of ignorance is - calling Loftin-White any tube direct coupled circuit .
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Old 11th November 2011, 09:47 PM   #6
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I want to know the dimensions of that 6800uF 500V capacitor
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Old 11th November 2011, 10:31 PM   #7
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I have a few 5600uf 420v Rifa cap about the size of a beer can... Dems lotsa jewels
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Old 11th November 2011, 10:41 PM   #8
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Yes, its a H and uF. The schematic attached is rather dumb. 68000uF cathode bypass is a nonsense. BTW, voltage on this monstrous 68000uF is rather low (several V probably).

I would be cautious to take schematic with so obvious flaws.

If you want to use similar but more proven design, take this schematic (it was printed in Russian-language Radio Hobby magazine published in Ukraine).

"" Loftin-White

Author says you can use output tubes 6S19P, 6P3S-E, GU50, 6S33S, 6S41S if you have corresponding output transformer.

Good luck !
Attached Images
File Type: jpg loftin2.jpg (18.7 KB, 668 views)
File Type: jpg loftin1.jpg (19.7 KB, 696 views)

Last edited by LinuksGuru; 11th November 2011 at 10:44 PM.
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Old 11th November 2011, 11:30 PM   #9
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Quote:
Originally Posted by LinuksGuru View Post
Yes, its a H and uF. The schematic attached is rather dumb. 68000uF cathode bypass is a nonsense. BTW, voltage on this monstrous 68000uF is rather low (several V probably).

I would be cautious to take schematic with so obvious flaws.

If you want to use similar but more proven design, take this schematic (it was printed in Russian-language Radio Hobby magazine published in Ukraine).

"" Loftin-White

Author says you can use output tubes 6S19P, 6P3S-E, GU50, 6S33S, 6S41S if you have corresponding output transformer.

Good luck !
I think the solution is in the text of your link and google translate ...

The russian sentence :

Quote:
Но наилучшим решением будет применение здесь полипропиленовых или бумажных (МБГЧ или МБГП) конденсаторов емкостью хотя бы 40-50 мкФ.
The google traduction to english :

Quote:
But the best solution is to use polypropylene or paper here (MBGCH or MBGP) capacitors at least 40-50 uF.
So, GloBug and LinuksGuru are right ...

But like said LinuksGuru said : "The schematic attached is rather dumb. 68000uF cathode bypass is a nonsense" ...

I think the C1 capacitor can be 470uF and Ck 47uF ... Plenty enough ... It is always funny to see how some people use a bazooka to kill a mosquito ...

Thanks to all !

Alain.
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Old 12th November 2011, 01:46 AM   #10
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by Zen Mod View Post
considering needed values , those are certainly microfarads ; even if 68mF at first cathode is sorta highish in value

what's puzzling me , and what's usually sign of ignorance is - calling Loftin-White any tube direct coupled circuit .
If you want to build a true Loftin-White amp, you don't need either of those caps, or power supply caps of the values shown. If you're serious about building it, I'll draw up a schematic.

Sheldon

Last edited by Sheldon; 12th November 2011 at 02:01 AM.
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