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Old 13th May 2012, 10:08 PM   #1
tricomp is offline tricomp  Denmark
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Default Russian triodes ГИ-15Б arriving in a few days

Hi,

From a supplier that I otherwise do business with I saw the Russian triode ГИ-15Б advertized for sale at 2.50/NOS
The same tube without cooling-fin is ГИ-150 and that is a mere 1.95/NOS.

So, I ordered a few.

YES, it will be tricky to mount it properly.
YES, it will require some rough driving it.
YES, it was not designed for continous duty.
YES, 800V at the anode, which incidentally is connected to the cooling-fin, is a lot of supply voltage.
YES, it requires forced air cooling and that will produce some noise.

In spite of the above, did anyone here use it for audio?

It has GOT to be the cutest little metal-triode around.
Have a look at data and pictures.


rgds,

tri-comp
Attached Images
File Type: jpg gi15b.jpg (32.0 KB, 662 views)
File Type: jpg gi150-1-size.jpg (5.6 KB, 646 views)
Attached Files
File Type: pdf ГИ-15Б - ГИ-150.pdf (174.5 KB, 108 views)
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Old 14th May 2012, 01:53 PM   #2
tricomp is offline tricomp  Denmark
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Too extreme?

I was thinking about removing the cooling-fins and strapping the anodes to a heat-pipe as in what was invented by Sony (Maybe not invented, but used first by) for some of their 1970'ies hi-fi amp's.
A square block of copper with proper threading for mounting on the anodetap bolted onto the heat-pipe with insulating mica's between should be doable.
It's the mechanical details that presents a challenge. Serious driving from a FET or a CF is not so difficult to achieve.

It's NOT on the top of my list at the moment but something that will be interesting to investigate in the future.
For now I'll keep an eye out for a suitable heat-pipe from an old amp.
The heatpipes you find inside laptops are far too small and the ones on VGA-cards or even CPU-coolers are twisted and turned into something meaningless.

rgds,

/tri-comp
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Old 14th May 2012, 04:21 PM   #3
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Alexander TANk on Russian DIY forum plays with such tubes.

-27
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Old 14th May 2012, 05:39 PM   #4
tricomp is offline tricomp  Denmark
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Thanks, I'll have a look. Russian language is not a big problem in this house

Here's the Sony TA-F55 Heat-Pipe I'm thinking about using.
Still available as a spare-part, can you believe it...?

rgds,

/tri-comp
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File Type: pdf TA-F55 Heat-Pipe.pdf (84.0 KB, 106 views)
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Old 24th May 2012, 08:01 AM   #5
tricomp is offline tricomp  Denmark
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The tubes arrived with and without cooling-fins. Absolutely pristine in original styrofoam cans.
Now, to find the heat-pipe.....
...AND to make the mounting hardware fittings to attach anodes with the heat-pipe.

Maybe I should do a breadboard to see if this will work at all before jumping in too deep

AND, I was right. It IS the cutest little metal/ceramic tube you ever saw!

rgds,

/tri-comp
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Old 28th May 2012, 05:03 PM   #6
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How about making a chimney out of lexan or plexiglass tube? Then under the chassis mount a fan running slowly for some airflow. With enough air moving the plastic should be ok.
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Old 29th June 2012, 08:45 AM   #7
tricomp is offline tricomp  Denmark
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astouffer,

Thanks for the tip.
I was thinking entirely w/o a fan because of the noise produced.
I bought this Arctic AMD CPU-cooler as my electronics supplier had it on sale for next to nothing.
---> Freezer A30 CPU Cooling ARCTIC
Removing the fan and lowering it into the chassis maybe 1/3 will make it look reasonable. Otherwise it's a tower sticking up that will look silly.
I talked with my CNC-friend who says doing triode- and chassis mounting-fittings for this cooler is a left-hand job.
Probably it is ..to him!
I found a German HAM that did a short-wave PA with this tube.
He extracted from one tube 50W without violating anode-spec's running 600Va.
Now, if he can do that in continous mode it promises good for Audio IF I can get the AB2-drive right.
Now I'll be waiting for the mounting fittings....

rgds,

/tri-comp

Last edited by tricomp; 29th June 2012 at 08:49 AM.
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Old 30th June 2012, 06:14 PM   #8
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Corsair cpu water coolers are also in that price range . You could build a se in a tractor model using this as the engine water cooled radiator up front with lexan sides to protect from touching . A proletariat model as it where with all due respect . I hope it does not offend our Russian brothers. You could call it the Proletariat Triode. Or even 2 triodes in push pull .

Last edited by Triodethom; 30th June 2012 at 06:19 PM.
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Old 30th June 2012, 07:20 PM   #9
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Quote:
Originally Posted by tricomp View Post
I found a German HAM that did a short-wave PA with this tube.
He extracted from one tube 50W without violating anode-spec's running 600Va.
You can get it from one Gu-50 without any danger.

Hint: use it in cathode follower mode, with negative power supply, and interstage transformer.
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Last edited by Wavebourn; 30th June 2012 at 07:23 PM.
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Old 1st July 2012, 10:20 AM   #10
tricomp is offline tricomp  Denmark
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Quote:
Originally Posted by Wavebourn View Post
Hint: use it in cathode follower mode, with negative power supply, and interstage transformer.
I know what you're saying but that's uncharted 'There be Dragons' territory for me
I was imagining a class AB2-PP with anodes isolated from the heatpipe with Silicon Al2/O3 or Mica pads. They're fine below 1500V imo.
Also the implications of finding suitable driver- & CF-OP transformers are a bit overwhelming, to say nothing of the costs.
Here we are dealing with tubes sub 2,-/ea. and I may even go with Compactrons for Pre, P/I & CF just to see what can be done below $100,- ex. iron.

More input welcome,

rgds,

/tri-comp
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