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811A Tube amp DIY project. This direct heated triode design uses the Svetlana SV811-3 Tube. 
Push Pull 6550 monoblocks DIY project
Submitted by costas sarris on Sun, 17/02/2008 - 17:38.
Push Pull 6550 DIY audio tube amps by costas sarris (1995)
The idea of building a DIY audio vacuum tube amplifier based on high-quality materials begins in the early 90's. Initially had to answer the question "Classic Push Pull or a Single ended amp ?" So starting the design somewhere in 1994 I decided to design οn a blank piece of paper, a pair of monoblocks push pull tube amps with a power supply in a separate chassis which would not use solid materials but rectifier tubes.
In the first photo appears the two channels of my tube amps DIY design which consists of 2 mono blocks with a tube power supply in a separate chassis.
The construction began in 1995 and completed in 1997.It's based on the draft circuit layout dynaco st70 but with several variations.These concern both the use of materials and in topology, because from the start I decided that the construction be implemented in three different units, two for the power amplifier , and one for the tube Power supply unit.
The whole project is housed in three P-shaped chassis which have been coated by 10mm thick rose wood attached to an internal "nerve".
The chassis is aluminum, thickness of 2mm and screwed on the side walls of the wooden coating with stainless screws.
In Power supply unit, because of the transformer weigh used to transverse aluminum are veins to avoid possible damage of the chassis.
The design is simple (Push-Pull) uses the 6550 power output tube, while the phase splitter and the driver stage uses an EF86, and an ECC83 per channel respectively.
You can find the 6550 Svetlana tube data in tube data pages.
Tube amp schematic
This is the final schematic diagram
and the PSU
costas sarris
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Push Pull 6550 monoblocks Tube amps DIY project, by costas sarris 
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excellent chassis ! I like
excellent chassis ! I like this clever dual mono construction.
Congratulations for your
Congratulations for your beautiful work!
I think you hay have posted
I think you hay have posted the wrong PS schematic.
Adam Austin
Hello Adam, What do you mean
Hello Adam,
What do you mean wrong PS schematic ?
costas
I think Adam means Orcad
I think Adam means Orcad PSpice program that use to draw schematics.
What is the power output in
What is the power output in watts? This is a very interesting project!
Never measured exactly but
Never measured exactly but it is rated about 45 watts in Ultra linear mode using the Svetlana 6550C tube.
Your amp look great are your
Your amp look great are your material list available
Thanks
Great piece of amplifier,
Great piece of amplifier, the "simply" way always attract me.
But, in order to reproduce your project, what kind of output transformer do you use ? what is the power rating of the OPT ? and, the primary impedance is 3400ohm ? The UL Grid Taps at what percentage are ?
Thanks a lot.
Michele
All OPTs in all my projects
All OPTs in all my projects are custom made designs. Primary impedance of the OPTs in this project are 3400 ohm / 60W /400mA. About the UL taps in this project, 20 % of the primary winding is common to the anode and screen-grid circuit.
cheers !
costas
Erotisi: ton m/t exodou pou
Erotisi:
ton m/t exodou pou ton briskoume?
kapoio katasthma?
Agorazeis kapoion etoimo
Agorazeis kapoion etoimo opws Lundahl or Hammond h apo thn Ellada katopin paraggelias apo kapoion pou ftiaxnei m/t exodou. Egw tous kanw paragelia analoga me ta xarakthristika pou thelw, se kapoion erasitexnh kataskeyasth sthn Servia (Beograd) einai hand made kai arketa akrivoi alla me poly kala ylika.
costas
Ok, Costa mipws boreis na
Ok, Costa mipws boreis na mou peis tin diefthinsi i to tilefono aftou tou Servou na parageilw gia mena?
Efxaristw!~
Giorgos
Giorgo you have mail costas
Giorgo you have mail
costas
the 12ax7 and the ef86 are
the 12ax7 and the ef86 are heated by the 6550???
does it need a preamp to run it?
thanks.
Lucas
You can either heat them
You can either heat them independently or use the same tap from the power transformer (depends on the currents of your PT)
I would recommend to feed into separate DC currents.
I use a pre amp.
costas
nice work!!! i like the
nice work!!! i like the style of the cassis!
i think i will build this amp for me, i love tube sound and i need THE amp to push 2 200 watt speakes
i think this amp is the best choice becouse the 6550/kt88 are the best sounding tubes i have ever seen. i don't know about the 2a3 300b triodes.
what about the THD of this amp? what is the rated power of each monobloc?
i dont like the distorted (overdrived) sound in higher volumes. i like to hear the warm tube sound without hearable distorton.
can i use another tube in place of the EF86? in my country these tubes are too much expensive and i dont want to spend a lot of money in just one tube. i have a quad of EH kt88
and 4 JJ 12AX7.
whats the input sensivity of this amp?
sorry for too much questions, thats all i need to know to get this amp im my system.
thanks. lucas.
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