Russian 6R2P for small amp.

[Junm]

Hello to the tube people here, I'm a tube newbee and just finished my 1st tube project (aikido preamp ) and want to build a matching amp using this russian tube that my friend sold to me at 0.70usd a piece.

I have 8 of this and i want to make a low wattage amp and put it to use either SE or PP but i prefer PP. My friend told me that its a small brother of GU-29 (a double beam tetrode).

Does anyone here can help me out with some schematics. I can't find one on the internet so I brought it here. I will attached the Datasheet in russian of this rare tube. Please help me out friends...

[Wavebourn]

Hi!

Actually, it is a small sister of GU-17 tube. It was used in small UHF transmitters that hung on balloons that transmitted weather measurements on ground bases, so parameters in the datasheet were given for such disposable conditions: 6.5W per anode for 100 hours only.
I would recommend to use no more than 4W per anode so it would live longer life.

[Junm]

Originally Posted by Wavebourn

Hi!

Actually, it is a small sister of GU-17 tube. It was used in small UHF transmitters that hung on balloons that transmitted weather measurements on ground bases, so parameters in the datasheet were given for such disposable conditions: 6.5W per anode for 100 hours only.
I would recommend to use no more than 4W per anode so it would live longer life.

Thanks wavebourn for the info, i'm really expecting you to come in....so what is the ideal plate to plate impedance and bias current with a 200v supply? Can they be connected parallel just like priboy to increase anode dissipation?.

[Wavebourn]

Originally Posted by Junm

Thanks wavebourn for the info, i'm really expecting you to come in....so what is the ideal plate to plate impedance and bias current with a 200v supply? Can they be connected parallel just like priboy to increase anode dissipation?.

Yes, you can connect them in parallel, of course, to get like 8W of dissipation per tube. Speaking of load and current, try to find it using load lines that you prefer. There is plenty of information about load lines here on the forum, including step-by-step instructions.

[Junm]

I have schematics of ELL80, will it be applicable to this? are this 2 similar.....

[nightuser]

GU-17 is biger brother for this tube (x1.5 times more power). I am not professional, but...

Try this.

ololo be prepared for troubles with encoding

http://www.radiostation.ru/home/graphics/usil_a01.gif (audio amp)

In this schematic tube is NOT so forced like it is recommended in datasheet. And i's mode of operation is not like recommended. it makes it life longer (up to 1000 hours instead of 100).

i can't give you a comprehensive help, but if something extremely important, you can ask. but without warranty. sorry.

[piano3]

The lowest few curves looks good for a high impedance current sink

[Junm]

Originally Posted by nightuser

GU-17 is biger brother for this tube (x1.5 times more power). I am not professional, but...

Try this.

ololo be prepared for troubles with encoding

http://www.radiostation.ru/home/graphics/usil_a01.gif (audio amp)

In this schematic tube is NOT so forced like it is recommended in datasheet. And i's mode of operation is not like recommended. it makes it life longer (up to 1000 hours instead of 100).

i can't give you a comprehensive help, but if something extremely important, you can ask. but without warranty. sorry.

Back from holiday.....hi nightuser....thanks for the site and schematics you shown....this will give me a better idea and basis to work on. I will try the design and what a coincidence... i also has 10 pcs of 6N16B 2 triode on hand to use as splitters. i just prepare now the OpT and supply trafo.

Ra-a in the schema is 5600ohms, Supply is 250Volts...and Pout is 5.6watt in PP mode using single tube... this is enough for me. and how about having another tube in parallel with the other.....will it be possible to reach 10watts?

[nightuser]

I can not say anything about how to double output power as it is not present in article. and i am not professional. Author only said that it is possible to get up to 8 Watts with single GU-17.

also some translation:

in this schematics 6n16b tube works in its recommended mode. input sensivity for maximal output power is 2x0.81 V_effective (as i understand effective == RMS). Input stage gain is 20 dB. you can use balansed input or single-ended (is SE choosen, you need to connect one input (in bottom left corner) to gnd and apply signal between other (upper) input and gnd).

For your information, RH means RLoad (R Load in raussian is "R nagruzki"). KTP as i understand means Coefficient of transformation.

[Junm]

Originally Posted by nightuser

I can not say anything about how to double output power as it is not present in article. and i am not professional. Author only said that it is possible to get up to 8 Watts with single GU-17.

also some translation:

in this schematics 6n16b tube works in its recommended mode. input sensivity for maximal output power is 2x0.81 V_effective (as i understand effective == RMS). Input stage gain is 20 dB. you can use balansed input or single-ended (is SE choosen, you need to connect one input (in bottom left corner) to gnd and apply signal between other (upper) input and gnd).

For your information, RH means RLoad (R Load in raussian is "R nagruzki"). KTP as i understand means Coefficient of transformation.

Well i got a lot clearer idea from you...google translation somestimes i cant understand...it good you elaboarate that... i will definitly try this schema using 1 tube first for testing...thanks again.

to tubes experts here, any comments on the linked schematics if ever used two tubes in parallel?