You can get 50watts from this, no trouble doing a stereo setup, mines monoblock, 805`s are cheap and easy to source nos or Chinese, i suggest geting nos RCA or Amprex or National Union, GE.
Sounds great and has good SET power.
http://www.diyaudio.com/forums/attachment.php?s=&postid=554384&stamp=1106011421
And for a great 845 Stereo kit, $1064us, great price, this is the best i`ve seen and very good quality.
http://www.diyfidelity.com.au/product_info.php?cPath=0_28&products_id=29
Cheers George
Sounds great and has good SET power.
http://www.diyaudio.com/forums/attachment.php?s=&postid=554384&stamp=1106011421
And for a great 845 Stereo kit, $1064us, great price, this is the best i`ve seen and very good quality.
http://www.diyfidelity.com.au/product_info.php?cPath=0_28&products_id=29
Cheers George
Ah, yes. Nick Sheldon (and friends) built this - a 3kW single ended valve amp! 
Simon Busbridge built an 833A amp running at a B+ of 2,400V for an output of 100W. The valve dissipates 350W on the anode and 100W in the filament! They look like about the size of a small refrigerator and needed wheels to be moved. Sadly details (and some very nice pictures) seem to have disappeared - the webpage was here but it doesn't seem to be working any more.
Certainly a nice contrast to those 1500mW little baby triode 'amps'
Gee, this might be a worthy rival to the Pass Monster thread!
Simon Busbridge built an 833A amp running at a B+ of 2,400V for an output of 100W. The valve dissipates 350W on the anode and 100W in the filament! They look like about the size of a small refrigerator and needed wheels to be moved. Sadly details (and some very nice pictures) seem to have disappeared - the webpage was here but it doesn't seem to be working any more.
Certainly a nice contrast to those 1500mW little baby triode 'amps'
Gee, this might be a worthy rival to the Pass Monster thread!
I can't understand why would you like to build a more than 10W SE amp!
There are so many disadvantages.Think about the iron and I mean the OPT.I believe that SE OPTs bigger than 10W are worse than OPTs smaller than 10W.And the main reason for this is the gap.
With today speakers that are 90dB or more you don't need more than 10W. Give all the money for a simple SE amp. It will be better than a more complicated one.
There are so many disadvantages.Think about the iron and I mean the OPT.I believe that SE OPTs bigger than 10W are worse than OPTs smaller than 10W.And the main reason for this is the gap.
With today speakers that are 90dB or more you don't need more than 10W. Give all the money for a simple SE amp. It will be better than a more complicated one.
Re: looking for powerfull Single Enbded diagram.
Konnichiwa,
I know quite a few, however even fewer are ever published, simply because they invariably require very high powersupply voltages which in turn require a level of skill and experience from the builder that is non too common.
And of course people with that kind of experiece do tend to know what to do and do not need to ask for: "powerfull Single Ended ( stereo integrated) amplifier diagram", at least they know how to turn a very basic diagram into a stereo Amplifier, integrated or not.
I would suggest therefore you stick the time being to a little less complex projects and avoid expensive and potentially lethal disappointments.
It is possible to make quite good sounding and powerfull push-pull amplifiers and the much discussed 6S33 is capable of around 18W power coutput with optimised amplifiers and you could always go PSE for double that, all this with a relatively low HT of 175V. Or for fun make it an SRPP/Gomez Output stage which can give a similar level of power with a simple parallel feed output transformer.
The results would certainly outperform by a large margin any 845 or 805 Amp I have heard and probably most 211 Amp's as well. The 833 Stuff I heard was in system context that made impossible to judge their sonic character as the whole system I heard them in sounded very bad.
Finally, I would argue that any speaker that cannot operate well with around 10 Watt is in dire need of re-design anyway, as it will invariably be plagued by excessive compression and distortion.
I have had the chance to hear the two known (to me) 833 Power Amplifiers in commercial production (the Lumly one based on S. Busbridges work and the Wavac), both in conjunction with very expensive systems, which however had fairly low sensitivity speakers. Using large orchestral music these Amp/Speaker combinations sounded much more artificial, constricted and befuddeled then a simple set of Tannoy Corner Reflex Boxes with 15" Tannoy Red Coaxial Speakers and a 300B SE Amp (what i had at the time). Worst, they well run out of steam (arguably in larger rooms than mine) well before my own system did.
My experience up to now has been that high power SE Amplifiers invariably begin to loose what makes SE Amp's interesting and if combined with low sensitivity speakers you might ahs well have bought a cheap transistor amp, for all the ability of the resulting system to make sound real.
Sayonara
Konnichiwa,
flyingman said:
I know quite a few, however even fewer are ever published, simply because they invariably require very high powersupply voltages which in turn require a level of skill and experience from the builder that is non too common.
And of course people with that kind of experiece do tend to know what to do and do not need to ask for: "powerfull Single Ended ( stereo integrated) amplifier diagram", at least they know how to turn a very basic diagram into a stereo Amplifier, integrated or not.
I would suggest therefore you stick the time being to a little less complex projects and avoid expensive and potentially lethal disappointments.
It is possible to make quite good sounding and powerfull push-pull amplifiers and the much discussed 6S33 is capable of around 18W power coutput with optimised amplifiers and you could always go PSE for double that, all this with a relatively low HT of 175V. Or for fun make it an SRPP/Gomez Output stage which can give a similar level of power with a simple parallel feed output transformer.
The results would certainly outperform by a large margin any 845 or 805 Amp I have heard and probably most 211 Amp's as well. The 833 Stuff I heard was in system context that made impossible to judge their sonic character as the whole system I heard them in sounded very bad.
Finally, I would argue that any speaker that cannot operate well with around 10 Watt is in dire need of re-design anyway, as it will invariably be plagued by excessive compression and distortion.
I have had the chance to hear the two known (to me) 833 Power Amplifiers in commercial production (the Lumly one based on S. Busbridges work and the Wavac), both in conjunction with very expensive systems, which however had fairly low sensitivity speakers. Using large orchestral music these Amp/Speaker combinations sounded much more artificial, constricted and befuddeled then a simple set of Tannoy Corner Reflex Boxes with 15" Tannoy Red Coaxial Speakers and a 300B SE Amp (what i had at the time). Worst, they well run out of steam (arguably in larger rooms than mine) well before my own system did.
My experience up to now has been that high power SE Amplifiers invariably begin to loose what makes SE Amp's interesting and if combined with low sensitivity speakers you might ahs well have bought a cheap transistor amp, for all the ability of the resulting system to make sound real.
Sayonara
Konnichiwa,
Previous setups of my system are here:
http://www.arduman.com/aa/Sayfalar/thorsten/thorsten.htm
Some more speakers around the house are covered here:
http://www.diyaudio.com/forums/showthread.php?postid=231369#post231369
http://www.diyaudio.com/forums/showthread.php?postid=234860#post234860
My exact current setup at home for the full system is:
Speakers are the commercial version of the Acrylic Baffle System, called 3d Sonics Transparence, mine are the "SE Version" prototypes with custom modified Supravox fieldcoil fullrange drivers, Horn Supertweeters and my usual Sub:
http://www.realhi-fi.com/products/sonic.html
Not sure what they will retail at, sensitivity is 97db/2.83V/1m and in room LF cutoff (-6db) of the Dipole part is around 50-60Hz.
Amplifiers are 300B SE based on the abridged WE 91B Circuit, all described here:
Oh no - YAWE91B300BA (Yet Another WE 91B 300B Amplifier)
Alterantive I have the 3D Sonics Monoblocks at hand as well, plus a few others.
Line Preamp is the Music First Audip Passive Magnetic Preamp:
http://www.mfaudio.co.uk
Digital Source are either CD Player or SACD Player from 3D Sonics (Prototypes again), what that means is passive I/V conversion and pure Valve analogue stage circuitry plus other tweaks as they work out.
http://www.realhi-fi.com/products/sonic.html
Analog source is the same as in the last system posted here:
http://www.arduman.com/aa/Sayfalar/thorsten/thorsten.htm
Cables are also all 3D Sonics Prototypes.
Here a picture of the sort of looks the whole 3D Sonics system manages. Speakers shown are the standard Prototypes, not the fieldcoil driver versions.
Sayonara
resident said:
Previous setups of my system are here:
http://www.arduman.com/aa/Sayfalar/thorsten/thorsten.htm
Some more speakers around the house are covered here:
http://www.diyaudio.com/forums/showthread.php?postid=231369#post231369
http://www.diyaudio.com/forums/showthread.php?postid=234860#post234860
My exact current setup at home for the full system is:
Speakers are the commercial version of the Acrylic Baffle System, called 3d Sonics Transparence, mine are the "SE Version" prototypes with custom modified Supravox fieldcoil fullrange drivers, Horn Supertweeters and my usual Sub:
http://www.realhi-fi.com/products/sonic.html
Not sure what they will retail at, sensitivity is 97db/2.83V/1m and in room LF cutoff (-6db) of the Dipole part is around 50-60Hz.
Amplifiers are 300B SE based on the abridged WE 91B Circuit, all described here:
Oh no - YAWE91B300BA (Yet Another WE 91B 300B Amplifier)
Alterantive I have the 3D Sonics Monoblocks at hand as well, plus a few others.
Line Preamp is the Music First Audip Passive Magnetic Preamp:
http://www.mfaudio.co.uk
Digital Source are either CD Player or SACD Player from 3D Sonics (Prototypes again), what that means is passive I/V conversion and pure Valve analogue stage circuitry plus other tweaks as they work out.
http://www.realhi-fi.com/products/sonic.html
Analog source is the same as in the last system posted here:
http://www.arduman.com/aa/Sayfalar/thorsten/thorsten.htm
Cables are also all 3D Sonics Prototypes.
Here a picture of the sort of looks the whole 3D Sonics system manages. Speakers shown are the standard Prototypes, not the fieldcoil driver versions.
An externally hosted image should be here but it was not working when we last tested it.
Sayonara
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