Hi
I did this project not too long ago, the idea is separate the out-put tube (805) and the out-put transformers in 3 cabinets for stereo . key point is shorten the speaker's cable , I can put the out-put transformer unit close to the speakers and use very short wires for connection, but the cable for connecting the out-put tube and the out-put transformer unit has to be long enough for your set-up,and this cable is driving in 800 dcv and 120ma , no need thick wire, only make sure for safety .
this amp is all DHT (#26 WE300B RCA805) in transformer coupling with no feedback, all silver include all transformers in sound path, each tube has it's own power supply.
result ? perfect , even I only use the small bookshelf place in floor for test, sound stage is open behind and up in the air
Tony KY Ma
I did this project not too long ago, the idea is separate the out-put tube (805) and the out-put transformers in 3 cabinets for stereo . key point is shorten the speaker's cable , I can put the out-put transformer unit close to the speakers and use very short wires for connection, but the cable for connecting the out-put tube and the out-put transformer unit has to be long enough for your set-up,and this cable is driving in 800 dcv and 120ma , no need thick wire, only make sure for safety .
this amp is all DHT (#26 WE300B RCA805) in transformer coupling with no feedback, all silver include all transformers in sound path, each tube has it's own power supply.
result ? perfect , even I only use the small bookshelf place in floor for test, sound stage is open behind and up in the air
Tony KY Ma
Attachments
That's a very slick setup. It looks well done all around. Have you put copper flashing on the iron laminations for noise reduction?
actually that does not help much, the set up is very quiet enough because of separating the power supply
Copper strip doesn't reduce noisy laminations..A pot of varnish usually solves this.
Nice to see , and even better to hear i suppose !
Will you be kind to provide the out amp schema ?
TT
Will you be kind to provide the out amp schema ?
TT
pot a transformer cost too much money , also come up with material issue ,noise problem for a power amp mainly is hum, although the out-put transformer is set with the power supply, but it is step down trans, so no noise there, cooper strip mainly for cosmetic, 800v and over 200 ma will ring the choke in power supply, 120 ma is OK, separate power supply from the amp will erase all noise problems,
the picture show the amp's schematic I hope you can read and understand, I don't know how to use computer to draw, my computer knowledge's level is very low
the circuit is quit simple, most diyers can handle I believe , only 800v high voltage will be a little bite too high to someone. the 805 tube is working in positive bias, so it sound different compare to those negative bias amp (300B 211 845 etc,) they sound like a bucket of water with holes in the bottom, water flow out just by nature, but positive bias amp sound like water come out by pressure just like jet, make image to have real body feeling and close to the real sound, if you want to try this taste and you are not a diyer, you can buy one from WAVAC, but the price !!!!
all audio silver transformers are custom made by Electric Print Audio and power trans is from Harmond
Tony KY Ma
the picture show the amp's schematic I hope you can read and understand, I don't know how to use computer to draw, my computer knowledge's level is very low
the circuit is quit simple, most diyers can handle I believe , only 800v high voltage will be a little bite too high to someone. the 805 tube is working in positive bias, so it sound different compare to those negative bias amp (300B 211 845 etc,) they sound like a bucket of water with holes in the bottom, water flow out just by nature, but positive bias amp sound like water come out by pressure just like jet, make image to have real body feeling and close to the real sound, if you want to try this taste and you are not a diyer, you can buy one from WAVAC, but the price !!!!
all audio silver transformers are custom made by Electric Print Audio and power trans is from Harmond
Tony KY Ma
Attachments
Yikes. I'd rather run the low voltage secondary wiring to the speakers. The thought of 800Vdc running across the room is,un-nerving.
What speaker brand are you using ? Still have some job to do placing everything if you intend to use it .How much did you pay for the silver Electra Print outputs ? Thanks for the schematic .
TT
TT
This amp and set up is not for everyone, especially small kids and pets in home, but we diyer always want to do something different and see how it work. of cause safety always come first. people should have knowledge of high voltage for it. all parts ( connectors cables etc😉 should be safe for that range, that's why no power supply schematic posted, design one by your own or let people who can do it for you.
this is a powerful amp can deliver 40W,no speakers it can't drive, tube SE amp's power is not same as solid state amp that is the issue of sound loud ans sound with mass, the amp is working in my friend(the owner)'s system, for the sub woofer to add on from 80HZ and under . best thing for sub woofer is the bigger return in sound quality, another similar amp for full range (QUAD electrostatic), also add on a JBL 2405 for supper high (15K and over) with amp too. maybe I can ask him to post some pictures for you. the price of the transformers that I can't remember exactly around 10-12K US$ ( copper is 1/3 to 1/4 of the price) for the whole set (6 pcs) you can e-mail (electaudio@cox.net) for that ask Jack say friend of Tony Ma of Toronto maybe he will give you good price,
Tony KY Ma
this is a powerful amp can deliver 40W,no speakers it can't drive, tube SE amp's power is not same as solid state amp that is the issue of sound loud ans sound with mass, the amp is working in my friend(the owner)'s system, for the sub woofer to add on from 80HZ and under . best thing for sub woofer is the bigger return in sound quality, another similar amp for full range (QUAD electrostatic), also add on a JBL 2405 for supper high (15K and over) with amp too. maybe I can ask him to post some pictures for you. the price of the transformers that I can't remember exactly around 10-12K US$ ( copper is 1/3 to 1/4 of the price) for the whole set (6 pcs) you can e-mail (electaudio@cox.net) for that ask Jack say friend of Tony Ma of Toronto maybe he will give you good price,
Tony KY Ma
Dear Luigi
Fax bias is good but for negative bias needs protection, once fail will damage the tube, self bias is doing protection, but in positive bias when it fail there will be less current, the tube is save, one thing , in interstage transformer, both dc currents has to be in opposite direction
Tony
Fax bias is good but for negative bias needs protection, once fail will damage the tube, self bias is doing protection, but in positive bias when it fail there will be less current, the tube is save, one thing , in interstage transformer, both dc currents has to be in opposite direction
Tony
Power supply
Hi Tony,
Thanks for the great project. Can you post circuit of the power supply.
In case I place order for the transformers, are there any part numbers needed to mention? I have been following a 805 SET amp circuit from Japan since the 90s. Sadly the custom transformer supplier TANGO closed its door. Although there is new TANGO started but they do keep the old custom transformer specs. I am so excited to see your project and can't wait to start my own.
Thanks in advance!
Hamilton
Hi Tony,
Thanks for the great project. Can you post circuit of the power supply.
In case I place order for the transformers, are there any part numbers needed to mention? I have been following a 805 SET amp circuit from Japan since the 90s. Sadly the custom transformer supplier TANGO closed its door. Although there is new TANGO started but they do keep the old custom transformer specs. I am so excited to see your project and can't wait to start my own.
Thanks in advance!
Hamilton
It's a terrible design, running HV cables and low-level drive signals several meters toward the speakers. There are many good reasons why manufacturers and most DIY'ers don't do this. Too bad, it looks like a nice design otherwise.
Hi Mamilton
Thank for your interest, where are you locate in Canada ? this amp now is located in a small town Havelock, Ontario, half hour east from Peterbough, I built it for my friend who own a Chinese restaurant in there, if you have chance to pass through that area I am sure he will welcome for listening, He has a tri amp system similar amp in tube 838 for full range, 826 for supper high, this 805 for the sub low.
there are 4 power supplys per channel, I use 5dcv 6A power pad x8(picture) for all the tube's filarment ( not the rectifier) it only cost 10$ each form computer surplus, cheapper than make by ourself, 2 for 805 in 10v, 1 for 5v 300B another one for #26 reduce to 1.5v with resistor.I put all this in a metal case, a lot of heat need ventilation, power transformer all from Hammond #728 for 805 , 273X for 300B 270CX for #26 and rectifier 3B25, 3B28 or 866A for 800v 5V4G for 300B 6cA4 for #26, another transformer 166S2 for 3B25 or 866A's heater, circuit is very simple with choke in put and filter with caps choke 193G for 805 193C for 300B 155J for #26. after rectified the voltage will higher than what we want, I use a power adjustable resistor to check and work out how much to reduce, the only thing has to be care is to find a safety connector and cable for HV, there are threads talking about in here,I am using Neutrik Powercon for the job, it is for AC (250v 20A) use not rate in HV, but as long as no pull out with power on, it will be safe cable I use Taflon hook up wire to braid for it, because Teflon can last higher temperature it rate only 600v but two wires togetter means 1200v, so far no spark happen, just make sure power off and dischage( HV off filament on for a while) all the caps for off or connecting cable, anyway so far so good no problems, allway pay attention to HV with care, this days not too good for DIYER because ElectroSonic Canada close down the warehouse no more pick up only by mail, will take longer for a new project
regard Tony Ma
Attachments
Thank you for the reply, I know there will a lot of argueing for this idea. manufacturers of cause won't do this too cost more cabinets and more parts, but why speaker cables can have so many different sound qualitys, and poeple will pay high price more than a amp just for a cable, I guess to drive high current for signal has a lot of factors, in power plant they send out power in high voltage and reduce in the other ends for less loose, that is my idea came from. if you don't try you never know, and this amp is not suitable for everyone especially with small kids and pets in home but result came out supper compare to the conventional one, maybe not all system can notice the different but the hi end system must can
regard Tony Ma
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