• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

829 or GU-29 audio amplifier schematics?

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#42
well, this is more an experiment with materials rather than with the sound 😉

It probably wont be a killeramp sonically, But I like to experiment with different ideas and designs
 

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#47
Audio_idiot said:
Hi,

I design and build a low power Simple 832 pp not too long ago, sound bright, open, punchy and its nothing close to sweet to me.

Just watch out for the Screen Grid current. And since the cathode for the 2 beam tetrode are common, I have no idea as of how to balance the 2 plate currents.


Cheers
Click to expand...

Finally built my 932 PP amp, very similar to what you have posted, but I got the idea of the phase inverter (self inversion) from diyparadise.com on Yeo's Simple EL84 circuit.

I initially breadboarded the amp using a center tapped choke for phase inversion, then I tried Yeo's circuit, both sounds good, but I like Yeo's circuit, it has less parts.

First I tried using 6n1p for driver, too much gain, used 12au7, same thing. Now I am using 6j5 and it sounds good!

I just got a pair of 12b4 which I will try to use for the driver.

I can't believe the bass out of this tubes.

If I did not build monoblocks, you can build a three tube push pull, and you can tell everybody it is SE.


😀
 
#49
mauro070463 said:
I am interested to 829B (russian GU-29) PP amp. Did you have new reliable schematic for this tube affordable by a beginner? many thanks, in advance !
Click to expand...

Hi all
I`m from Russia (sorry for my English)
Here is a little explanations about GU-32

I don`t understand, why are you searching Russian GU-29/32
because it is truly American tube, RCA 831
and i`m planning to ebay RCA original, instead of GU 32

Some russian horned tubes
GU 32 tube passport link, pdf link (ГУ-32 in russian)

set of Double Beam Power Tube for Generating , copy of RCA tubes
photo (ГУ-19, ГУ-32, ГУ-29, ГИ-30), museum link
photo (6С33С , ГУ-29 ,ГИ -30 , ГУ -32 , ГУ -19-1 , 6Р3С-1)
ГМИ-90 and ВИ1-30/25, 33kV/40A, just for fun 🙂 The ruler in centimeters, not inches.

For understanding russian tubes naming wiki link,
designation system for high-power transmitter tubes:
G (Russian Г, for "generatornaya" = "For Generating". Little academic trick. Means that tube modulate power supply energy
U (Russian У) - ultra-shortwave (25-600 MHz) tube.
I (Russian И) - impulse tube.
most of them Ulyanovsk made, not Svetlana.

Price
In Russia GU-32 about 3 USD and GU-29 about 4 USD. Tube socket is rare, about 5 USD. proof link

Shematics
Google search request for GU 29 and 32 shematics

here is some popular links
1
2
3
4 // long flame
5
6 //need registration
7
8

and many more schematics, discussions, variants
u a welcome 🙂
I will be here short time. Any questions - ask me.
 
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#51
Hi SlonSpb....

I have several Gu-17(12w) and his little brother 6R2P (6.5w)...twin transmitting tetrodes which is i think belongs to the family of gu-29....do you have some shematics and links to share?
thanks...
 
#52
Junm said:
I have several Gu-17(12w) and his little brother 6R2P (6.5w)..do you have some shematics and links to share?
Click to expand...

Just google it! 🙂 And google-translate.
ГУ-17 схема

Initially this tube is for transmitter ~144Mhz like this
Bulgarian transceiver schematics
Bulgarian transceiver case
pcb

Due to 2.5 ma/V this tube requires good driver.
People are more like GU-29

some discussion, graphs, e.t.c.

Some schema
1
ГУ-17 in thetrode _http://www.audioportal.su/forums/attachment.php?attachmentid=5475&d=1177181740
ГУ-17 в triode _http://www.audioportal.su/forums/attachment.php?attachmentid=5476&d=1177181763
need registration
 
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