829 or GU-29 audio amplifier schematics?

[soundbrigade]

Well, 829/832 classifies as UFO-tubes and this is what??
UFU-tubes meets slimy monster from the Lousiana swamps

I have always wanted to do something crazy like this.

[adalin]

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

[soundbrigade]

Adalin, you're from Gothenburg??? You must take it to the DIY-summit on 21/4. You've heard about that?!
Else check HiFi-forum

What is the chassis made of? It looks either as molten bakelite or clay or an old motorblock for a BMC Cooper .......

[7N7]

I like these double beam tetrodes too. I have made curves for the ones Tom listed (should be QQVO6-40 Tom!)and also for QQVO7-50 and YL1071 (the best of the lot).

Copies with pleasure on request.

7N7

[lumeimei]

Picture of my FU 32(chinese) 832A

[alexg]

Originally posted by lumeimei
Picture of my FU 32(chinese) 832A

Can you share the schematic? Thanks.

[alexg]

Originally posted by Audio_idiot
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

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.

[mauro070463]

HI all, I know that a lot of time past from the last message, but 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 !

[SlonSpb]

Originally Posted by mauro070463

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 !

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.

[coresta]

The 829 is exactly a twin 807 in the same bottle ...