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Old 23rd January 2009, 06:56 AM   #11
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Default Re: nice new post´s

Quote:
Originally posted by therapy_fan
if you have any schematics, datasheet´s of 2J27L, 12J1L, 1T4, C3G or any of the other audio tubes i would be really thankful
You can get VT spec sheets from Frank's
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Old 23rd January 2009, 08:26 AM   #12
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I find this site by Max Robinson contains lots of ideas for both simple and more advanced projects.
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Old 23rd January 2009, 11:01 PM   #13
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Default Some projects with 2SH27L (=2J27L)

Dear Matthias and others,

As promised I'll start here with links to some projects on the web using the Russian battery valve 2SH27L (=2J27L).

First, a link to a nice collection of datasheets for this tube, with a translation of the Russian text into German:
http://www.fragjanzuerst.de/rb/2SH27L.pdf

Then, four links to various receiver projects (mainly "audion" receivers, in other words, simple "straight" receiver designs):
http://www.jogis-roehrenbude.de/Lese...den-Audion.htm
http://www.jogis-roehrenbude.de/Lese...ss/Negadyn.htm
http://www.mydarc.de/dk3wi/html/mw-a...und_18v_a.html
http://www.jogis-roehrenbude.de/Lese.../Audion2V4.htm

A link showing some simple oscillators:
http://www.elexs.de/roe2SH27L.htm

Finally, some amplifier designs.
A single-ended power amplifier from Hungary with 2SH27L and 4P1L: http://www.jgytf.u-szeged.hu/~kadar/...1l/page_01.htm
And a push-pull amplifier from Germany with twenty-two 2SH27L tubes ! : http://www.jogis-roehrenbude.de/Lese...schreibung.htm

I have built and tested a preamp stage with the 2SH27L based on the previously mentioned schematic from Hungary (University of Szeged), it works very well. I add a hand-drawn schematic, please note that the cathode resistor is a 2k Cermet trimpot. This should be adjusted in such a way that the anode voltage is 67 V (= the anode current is 2 mA).

Hopefully these hyperlinks will be copied properly to the diyaudio forum, and the handdrawn schematic will be readable.

Best regards,

Aren van Waarde
aka arensattic
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Old 24th January 2009, 07:52 AM   #14
Bitrex is offline Bitrex  United States
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Quote:
Originally posted by ray_moth
I agree that 1T4 (a.k.a. DF91?) is a nice miniature 7-pin battery pentode. It needs 1.4 v for the filament. I built my very first single tube grid-leak detector AM headphone receiver with reaction control using this little tube, with a Repanco LW/MW tuning coil.

I built a regenerative reciever kit that used two 1T4 tubes, one as an RF amplifier and the other as the regenerative detector. Unfortunately one evening a while back I got the supply terminals confused and put the 45 volt B+ across the tube heaters. Thanks for reminding me I need to pick up some more.
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Old 24th January 2009, 12:29 PM   #15
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Default nice

Thx for the awesome replays. i will absolutely out the 2SH27L pre amp stage! twenty-two 2SH27L amp omg! that was a really nice amp!

btw i just ordered a Tube amp! an Dynavox VR-70E for just under 400euro i just had to buy it! seen some wery impressive
modifications on an vr-70 so i had to try one out!


thx again for the nice replay i will try out the nice looking schematic seems strait forward enogh.

Mattias
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Old 29th January 2009, 09:01 PM   #16
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Default Some projects with C3G

Dear Matthias and others,

It is a little busy right now, but here are some projects for the C3G pentode (I don't have experience with this tube myself):

First, a few headphone amplifiers:

http://www.jogis-roehrenbude.de/Lese...C3g-KH-Amp.htm

http://www.jogis-roehrenbude.de/Lese...schreibung.htm

http://www.jogis-roehrenbude.de/Lese...ns-C3g/c3g.htm

Then, a few RIAA preamplifiers (for turntable cartridge):

http://www.jogis-roehrenbude.de/Lese...schreibung.htm

http://www.ak-tubes.de/

Finally, a funny tutorial about calculating preamp stages with a pentode like the C3G:

http://roehrenfibel.files.wordpress....tus-2-band.pdf

I must apologize for the fact that all these documents are in German (no problem for a Dutchman like me, but perhaps a problem for other readers). You may try Babelfish for a mechanical translation from German to English, also: the schematics are simple and straightforward.

Best regards,

Aren van Waarde
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