I'm looking for audio amplifier schematics using 829 or GU-29 tubes. After searching this forum, no schematics of my "taste" could be found for these tubes... The following interesting schematic was found for the little brother of the 829, the 832:
http://www.audiohobbyist.com/projects/832.htm
Does anyone have a comparable schematic for an amplifier with the 829 or GU-29 tube (more output than 832)? SE schematics are also welcome!
Kr,
Martin
http://www.audiohobbyist.com/projects/832.htm
Does anyone have a comparable schematic for an amplifier with the 829 or GU-29 tube (more output than 832)? SE schematics are also welcome!
Kr,
Martin
Thanx!
These schematics are new for me, maybe I should start searching with Russian characters 🙂
Today, I've located the sockets for these tubes at an affordable price, it will take some time before I've located all parts for a complete amp.
These schematics are new for me, maybe I should start searching with Russian characters 🙂
Today, I've located the sockets for these tubes at an affordable price, it will take some time before I've located all parts for a complete amp.
Coldwar
You might want to take a look at
www.ultranalog.com
coldwar.
You will find a lot of usefull info there.
I build this fine sounding amp some years ago.
Regards
You might want to take a look at
www.ultranalog.com
coldwar.
You will find a lot of usefull info there.
I build this fine sounding amp some years ago.
Regards
For those who are interested in amplifiers with these kind of tubes, I've found a nice project with a tube comparable to the 829 on Jogis page:
http://www.jogis-roehrenbude.de/Leserbriefe/Alexander-Bromme-3E29-SE/3E29.htm
For this SE amplifier, the JAN 3E29 tube is used (which is mentioned to be similar to the 829).
http://www.jogis-roehrenbude.de/Leserbriefe/Alexander-Bromme-3E29-SE/3E29.htm
For this SE amplifier, the JAN 3E29 tube is used (which is mentioned to be similar to the 829).
This is a nice 829B amp.
http://www.pmillett.com/829b_amplifier.htm
I have the tubes en sockets all ready 😀
http://www.pmillett.com/829b_amplifier.htm
I have the tubes en sockets all ready 😀
Saw this thread on friday and thought for myself, this I must try
I built a prototype today and I find it quite interresting I must say, the first thing I notised was that the amp is completely noiseless.
When I started the first channel to test it I thought it didnt work, there was no hum or fiss in my speaker. Then I turned the sinusgenerator on and sure, there was sound 🙂
I havent meassured dist and outputpower yet but there is potensial in this tube, I will build one in a real chassi, thats for sure 🙂
Got a bad pic from the prototype, I got no real camera so no closeups 🙁
tubeamp
I built a prototype today and I find it quite interresting I must say, the first thing I notised was that the amp is completely noiseless.
When I started the first channel to test it I thought it didnt work, there was no hum or fiss in my speaker. Then I turned the sinusgenerator on and sure, there was sound 🙂
I havent meassured dist and outputpower yet but there is potensial in this tube, I will build one in a real chassi, thats for sure 🙂
Got a bad pic from the prototype, I got no real camera so no closeups 🙁
tubeamp
Hi Adalin,
The results from your prototype sound very promising!
Did you use the 829/GU-29 or the 832/GU-32 tube for this setup? What schematic and operating voltage are you using?
Please keep us informed on your project and findings, I like the concept of using unusual tubes for audio applications 🙂
Kind regards,
Martin
The results from your prototype sound very promising!
Did you use the 829/GU-29 or the 832/GU-32 tube for this setup? What schematic and operating voltage are you using?
Please keep us informed on your project and findings, I like the concept of using unusual tubes for audio applications 🙂
Kind regards,
Martin
I have a small stock of 832-A philips and some qqe06/40 I can try both in the amp just have to change the bias a little, I got no 829 Im afraid.
distortion, hmmm worse than I expected. with the 832 @ 7W outputpower I have 2,5% and the 1% mark is at 4W measured with my ferrograph
but if one compare it with disortion
its allmost spot on.
Its not a high power unit 🙂 one can probably squeese out a few extra watts with qqe 04/60 I guess but i have not tried yet
distortion, hmmm worse than I expected. with the 832 @ 7W outputpower I have 2,5% and the 1% mark is at 4W measured with my ferrograph
but if one compare it with disortion
its allmost spot on.
Its not a high power unit 🙂 one can probably squeese out a few extra watts with qqe 04/60 I guess but i have not tried yet
Adalin,
From what I have found on 832 audio amplifiers on the Internet, the output power in PP does not exceed 10W (7W is OK). Do you apply feedback with your setup? If yes, what resistor value are you using in the feedback link?
Both GU-29 and GU-32 tubes are frequently found on Ebay for a reasonable price (between $3 and $5 each). For those who happen to have a pile of output transformers on the shelve, a nice (and cheap!) way to get some experience with the less common (but still interesting) tubes available 🙂
Kind regards,
Martin
From what I have found on 832 audio amplifiers on the Internet, the output power in PP does not exceed 10W (7W is OK). Do you apply feedback with your setup? If yes, what resistor value are you using in the feedback link?
Both GU-29 and GU-32 tubes are frequently found on Ebay for a reasonable price (between $3 and $5 each). For those who happen to have a pile of output transformers on the shelve, a nice (and cheap!) way to get some experience with the less common (but still interesting) tubes available 🙂
Kind regards,
Martin
I had planned to glue a 829SE together but I sort of came to a conclusion that the transformers intended for the job were too small so I am going to use a 807 instead.
The original idea was something like this:
http://www.pastisch.se/faktiskt/6sj7_829b.jpg
I have a pushpull design design similar to some 832PP-amps.
http://www.pastisch.se/faktiskt/k_6N9P_829B.pdf
The 6N9P is confusing. I can find a (Russian tube) 6N9C = 6SL7 in my lists and a 6N6P = 12BH7A but not a 6N9P...
The original idea was something like this:
http://www.pastisch.se/faktiskt/6sj7_829b.jpg
I have a pushpull design design similar to some 832PP-amps.
http://www.pastisch.se/faktiskt/k_6N9P_829B.pdf
The 6N9P is confusing. I can find a (Russian tube) 6N9C = 6SL7 in my lists and a 6N6P = 12BH7A but not a 6N9P...
Ooops the 829PP was already posted.
A 832PP is scheduled - got a pair of nice (blue) X-formers from Edcoreusa: 10W, 8Kohm Raa, 8ohm O/P.
I find no information what so ever about the Pout from 829 and 832 in PP and SE respectively.
A 832PP is scheduled - got a pair of nice (blue) X-formers from Edcoreusa: 10W, 8Kohm Raa, 8ohm O/P.
The 6SL7 is known in China as the 6N9P:
US 6SL7
Chinese 6N9P
Russian 6N9S
Since the last schematic I have posted is from China (there are some Chinese characters visible in this schematic), the 6N9P is used. I have ordered some 6N9S tubes for the preamp and phase shift section of this amplifier.
I plan to use PP transformers from a local company (www.klare.nl) for this setup, they sell 30W PP transformers (8K primary) at a reasonable price.
The Chinese schematic promises 20W (@ 10% distortion without NFB...) using the 829 as power tube. Most 832 setups report about 7W in PP.
US 6SL7
Chinese 6N9P
Russian 6N9S
Since the last schematic I have posted is from China (there are some Chinese characters visible in this schematic), the 6N9P is used. I have ordered some 6N9S tubes for the preamp and phase shift section of this amplifier.
I plan to use PP transformers from a local company (www.klare.nl) for this setup, they sell 30W PP transformers (8K primary) at a reasonable price.
The Chinese schematic promises 20W (@ 10% distortion without NFB...) using the 829 as power tube. Most 832 setups report about 7W in PP.
Thanks for the answers!
I belong to a Swedish HiFi-forum where there has been a discussion on so called UFO-tubes (UFO-tube spotting ) The duo 829/832 are tubes that look queer and pose a challange to be put into amplifying audio signals. And the idea of using ONE tube for a PP-amp is thrilling.
However I follow up with yet another question. How to you (who use these tubes) arrange for a connection to the "anode horns"?
I belong to a Swedish HiFi-forum where there has been a discussion on so called UFO-tubes (UFO-tube spotting ) The duo 829/832 are tubes that look queer and pose a challange to be put into amplifying audio signals. And the idea of using ONE tube for a PP-amp is thrilling.
However I follow up with yet another question. How to you (who use these tubes) arrange for a connection to the "anode horns"?
I haven't found a ceramic anode connector dedicated for this tube. Looking at the audio projects on Internet with these tubes, several improvised solutions can be found:
Wire-wrapping: looks like a very reliable connection, often found in mil-spec equipment. Only solid copper wire can be used for this type of connection.
Soldring: with a risk of damaging the tube, solder the wire directly on the anode pins. I'm not sure if the solder connection is reliable when heated by the vacuum tube.
PC connector: some brave people have trashed a powerconnector of a PC powersupply and removed the pins of one of the plugs. These connectorpins seem to have the right size for a good clamp on the anode pin. Advantage with this setup is that you can use flexible silicone wire soldered to the connector pin, without risk of damaging the tube.
Wire-wrapping: looks like a very reliable connection, often found in mil-spec equipment. Only solid copper wire can be used for this type of connection.
Soldring: with a risk of damaging the tube, solder the wire directly on the anode pins. I'm not sure if the solder connection is reliable when heated by the vacuum tube.
PC connector: some brave people have trashed a powerconnector of a PC powersupply and removed the pins of one of the plugs. These connectorpins seem to have the right size for a good clamp on the anode pin. Advantage with this setup is that you can use flexible silicone wire soldered to the connector pin, without risk of damaging the tube.
Just remembered, I bought new connectors för my Priboi in Russia - guess the pin size for 6R3S is the same as for 829/832 - else I have seen nothing.
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