Dear Steevo,
if you don't mind me asking, I would like to have the xtochino amplifier files.
Would you please send it to dexter@tekom.net
many thanks in advance.
if you don't mind me asking, I would like to have the xtochino amplifier files.
Would you please send it to dexter@tekom.net
many thanks in advance.
Dear Steevo,
if you don't mind me asking, I would like to have the stochino amplifier files.
Would you please send it to ejno@vp.pl
many thanks in advanc
if you don't mind me asking, I would like to have the stochino amplifier files.
Would you please send it to ejno@vp.pl
many thanks in advanc
I have put the article for the Giovanni Stochino Power Amp On the following Web Link http://steeve101uk.googlepages.com/home
so I dont have to email it if you want it.
so I dont have to email it if you want it.
stochino
Hi Sam,
The PCB of your design - was it one sided or two sided? Would you mind sharing with us your design? Free or for some charge. As you did not experience any problems (eg HF oscillation) it was really good design.
I know that Bora was redesigning Stochino's amp to work with bipolars. I do not know if he finished this task. I saw only a few experimental versions. Hes version was also going towards notable simplification. Quite interesting. As most speakers are not very sensitive I prefer more powerful version of Stochino using IRFP240/9240 mosfets. It might be also interesting to try it with more powerful lateral otput devices such as top Exicon.
cheers,
Hi Sam,
The PCB of your design - was it one sided or two sided? Would you mind sharing with us your design? Free or for some charge. As you did not experience any problems (eg HF oscillation) it was really good design.
I know that Bora was redesigning Stochino's amp to work with bipolars. I do not know if he finished this task. I saw only a few experimental versions. Hes version was also going towards notable simplification. Quite interesting. As most speakers are not very sensitive I prefer more powerful version of Stochino using IRFP240/9240 mosfets. It might be also interesting to try it with more powerful lateral otput devices such as top Exicon.
cheers,
Might not be "ideal" pair anthough the name i similar..
I think if I remember correctly I used 9140 och 240, or 440 and 9240, dont remember now..
And regarding 640/9640, go throw them in the sea, I've never been able to get them to be able to take som serious abuse..
Depending on the location, taking the rails higher than 45vdc might pose a risk for the 9140.
I had excellent results with IRFP9140/IRFP240 on Greggy Ball's SKA GB50D amp and JAM's mosfet A-40 version of the Pass classic.
Thanks to Ilimzn, and the web wonder.
Watch out not to buy IRFP9140N, flush 'm if you have.
A lot of vendors offer the 9140s but they'll send you the N version of the IRFP9140. (even wholesalers, as i've found out the hard way)
I made the mistake before i read Ilimzn's warning on the 9140N, but it did save me from wasting plenty time on trouble shooting.
Initially, i also used the 240/9240 combo on the SKA. On electrostats, the 9140 is clearly the better sparring partner for the 240. Read the posts of the Croatian expert.
(IRFP9140 prices vary a great deal, it pays off to shop around)
I had excellent results with IRFP9140/IRFP240 on Greggy Ball's SKA GB50D amp and JAM's mosfet A-40 version of the Pass classic.
Thanks to Ilimzn, and the web wonder.
Watch out not to buy IRFP9140N, flush 'm if you have.
A lot of vendors offer the 9140s but they'll send you the N version of the IRFP9140. (even wholesalers, as i've found out the hard way)
I made the mistake before i read Ilimzn's warning on the 9140N, but it did save me from wasting plenty time on trouble shooting.
Initially, i also used the 240/9240 combo on the SKA. On electrostats, the 9140 is clearly the better sparring partner for the 240. Read the posts of the Croatian expert.
(IRFP9140 prices vary a great deal, it pays off to shop around)
Attachments
best N-P high voltage and power matches
Hi,
True, IRFP9140 is a good match for IRFP240, notably better than the 9240 at voltages below 100.
There is also not a great problem to find a few good N-P matches for use at lower voltages and powers. The problem is if one needs higher (120V plus) and power (over 100-150W per device). So the question is:
what are the best higher voltage/power N-P matches available on the market today?
Any success stories here going beyond 240/9240 and 640/9640 combinations?
cheers,
Hi,
True, IRFP9140 is a good match for IRFP240, notably better than the 9240 at voltages below 100.
There is also not a great problem to find a few good N-P matches for use at lower voltages and powers. The problem is if one needs higher (120V plus) and power (over 100-150W per device). So the question is:
what are the best higher voltage/power N-P matches available on the market today?
Any success stories here going beyond 240/9240 and 640/9640 combinations?
cheers,
You need G-man Kanwar for that question.
I've been fond of fully balanced amps ever since i heard the Burmester 850s.
The 240/9140 duo is good for +500 watts/8, especially nice with crossed feedback as used in Pass products, taking distortion levels quadratically inversed down.
Funny enough, Burmester named his sustained class A input stage trick X-amp technique.
I've been fond of fully balanced amps ever since i heard the Burmester 850s.
The 240/9140 duo is good for +500 watts/8, especially nice with crossed feedback as used in Pass products, taking distortion levels quadratically inversed down.
Funny enough, Burmester named his sustained class A input stage trick X-amp technique.
Re: best N-P high voltage and power matches
Hi Janusz,
The higher voltage complementary Pair is IRFP350/9350.....400V +14/-11A devices From IXYS.......
Kanwar
janusz said:
Hi Janusz,
The higher voltage complementary Pair is IRFP350/9350.....400V +14/-11A devices From IXYS.......
Kanwar
Class G, Kanwar.
Class H may be more appropriate but they haven't made a movie called H-men yet.
(G-Men, James Cagney, 1935)
Class H may be more appropriate but they haven't made a movie called H-men yet.
(G-Men, James Cagney, 1935)
irfp9350
Thanks Kanwar,
Have you got maybe a datasheet for IRFP9350?
I couldn't find it on the net. IRFP350 is rather popular (IR, Intersil, Samsung etc). Has a high gate capacitance, which has to be delt with. I did not know that there is irfp9350.
Just in case - where one could buy these IXYS MOSFETS on the net?
Thanks again,
cheers,
Thanks Kanwar,
Have you got maybe a datasheet for IRFP9350?
I couldn't find it on the net. IRFP350 is rather popular (IR, Intersil, Samsung etc). Has a high gate capacitance, which has to be delt with. I did not know that there is irfp9350.
Just in case - where one could buy these IXYS MOSFETS on the net?
Thanks again,
cheers,
Re: irfp9350
Janusz, sorry i don't have the datasheet, because the IRFP9350 is discontinued and is now obsolete. but the pair is now replaced by IXTH11P50/IXTH22N50P complementary pairs...
janusz said:
Janusz, sorry i don't have the datasheet, because the IRFP9350 is discontinued and is now obsolete. but the pair is now replaced by IXTH11P50/IXTH22N50P complementary pairs...
ixys
Thanks Kanwar and Smithy,
Smithy, thanks for the link to your site. I have four original EW boards. Two are alredy partly filled in with components. I was curious about Sam's design - especially if it was one sided board.
How is your heatsing performing?
I intend to use very similar 30cm heatsinks with flange from Altronics. The flange will be at the right angle to the board - its bottom parallel to the bottom of the case so the fins will be up to maximize heat transfer to the outside.
The case is from Jaycar and is almost finished with PS bridges and a bank of filtering caps - 6x10,000uF/80V Nichicon KG. With two amp boards, regulated PS board and protection board there is no room for anything else so all the transformers are in a separate box already operational. Problem that I have no time to finish the amp at the moment.
cheers,
Thanks Kanwar and Smithy,
Smithy, thanks for the link to your site. I have four original EW boards. Two are alredy partly filled in with components. I was curious about Sam's design - especially if it was one sided board.
How is your heatsing performing?
I intend to use very similar 30cm heatsinks with flange from Altronics. The flange will be at the right angle to the board - its bottom parallel to the bottom of the case so the fins will be up to maximize heat transfer to the outside.
The case is from Jaycar and is almost finished with PS bridges and a bank of filtering caps - 6x10,000uF/80V Nichicon KG. With two amp boards, regulated PS board and protection board there is no room for anything else so all the transformers are in a separate box already operational. Problem that I have no time to finish the amp at the moment.
cheers,
Janusz
I have been using the same heatsinks for years and they work well - never run too hot to touch. As I mentioned to you, I am swapping over cases at the moment - I used 2 3 unit rack mounts from Jaycar, but have custom built some aluminium cases which are at the anodisers now (bright red!). I am changing over my caps to 4 x Mundorf 33000uF per channel + using IXYS bridge. Years ago I designed a PCB for the regulated power supply, using LT1033/LT1085 regulators. I would have to look back to try to find the files (it was done in Protel) if you would like them.
I have 4 x unused Elna Cerafine 10000uF/100V caps + I will have 16 x used Elna Cerafine 10000uF/100V caps that I want to sell if you or anyone else (in Australia) are interested in.
I have been using the same heatsinks for years and they work well - never run too hot to touch. As I mentioned to you, I am swapping over cases at the moment - I used 2 3 unit rack mounts from Jaycar, but have custom built some aluminium cases which are at the anodisers now (bright red!). I am changing over my caps to 4 x Mundorf 33000uF per channel + using IXYS bridge. Years ago I designed a PCB for the regulated power supply, using LT1033/LT1085 regulators. I would have to look back to try to find the files (it was done in Protel) if you would like them.
I have 4 x unused Elna Cerafine 10000uF/100V caps + I will have 16 x used Elna Cerafine 10000uF/100V caps that I want to sell if you or anyone else (in Australia) are interested in.
Hi Smithy,
Thanks, but I have already designed a board for the regulated PS. I did it manually. I also have one board meant for the Silicon Chip amp (SC design) but it is not the best of designs.
I think you should have no problems with selling Elna Cerafine caps. These are among the fastest. Thanks for the offer but I already have 12 10,000uF KG Nichicons so I do not need more big caps at the moment. I believe I should have used at least 4x22,000uF per PS for two boards rather than 6x10,000uF. Maybe I'll go for an upgrade in a few years.
I remember that originally I thought about getting Sikorel caps, which are apparently the fastest (TNT tests) or at least were a few years ago at the ime of that test. Unfortunately their price was quite high so I opted for much cheaper KG Nichicons, which like Elna and a few other, were not that much slower anyway.
I never used IXYS fast bridges. I thought about using them but again the price put me off. So I'm using two International Rectifier 35A bridges - one for the positive and one for the negative rail - instead per box. But I am curious about your experience with IXYS bridges. Is the difference audiable? If yes I may go for 4x27A bridges when the time for some upgrade comes.
I use fast diodes in the regulated PS and in PSes of all other bits of my equipment such as preamps and active crossovers. Must admit that my ears cannot tell the difference but I know it must be there. Use of the quality caps and proper filtering in general makes a difference to my ears as well as some ICs (but not all) but the difference is not huge - except for the extremes of course.
As Stochino's amp will be much faster than any amp I have ever built the use of fast rectifiers might be ear justified. I'm curious. I have also never heard of Mundorf caps. How do these compare with Elna Cerafine?
The only esoterics I use are Black Gate NP caps in parallel with polys in the NFB of the Stochino amps but to hear their impact I have to wait until I'll finish the amp and plug it in.
cheers,
Thanks, but I have already designed a board for the regulated PS. I did it manually. I also have one board meant for the Silicon Chip amp (SC design) but it is not the best of designs.
I think you should have no problems with selling Elna Cerafine caps. These are among the fastest. Thanks for the offer but I already have 12 10,000uF KG Nichicons so I do not need more big caps at the moment. I believe I should have used at least 4x22,000uF per PS for two boards rather than 6x10,000uF. Maybe I'll go for an upgrade in a few years.
I remember that originally I thought about getting Sikorel caps, which are apparently the fastest (TNT tests) or at least were a few years ago at the ime of that test. Unfortunately their price was quite high so I opted for much cheaper KG Nichicons, which like Elna and a few other, were not that much slower anyway.
I never used IXYS fast bridges. I thought about using them but again the price put me off. So I'm using two International Rectifier 35A bridges - one for the positive and one for the negative rail - instead per box. But I am curious about your experience with IXYS bridges. Is the difference audiable? If yes I may go for 4x27A bridges when the time for some upgrade comes.
I use fast diodes in the regulated PS and in PSes of all other bits of my equipment such as preamps and active crossovers. Must admit that my ears cannot tell the difference but I know it must be there. Use of the quality caps and proper filtering in general makes a difference to my ears as well as some ICs (but not all) but the difference is not huge - except for the extremes of course.
As Stochino's amp will be much faster than any amp I have ever built the use of fast rectifiers might be ear justified. I'm curious. I have also never heard of Mundorf caps. How do these compare with Elna Cerafine?
The only esoterics I use are Black Gate NP caps in parallel with polys in the NFB of the Stochino amps but to hear their impact I have to wait until I'll finish the amp and plug it in.
cheers,
Hi Janusz
I've been using Hexfreds for the unreg and reg supply. I haven't tried the IXYS bridges yet, but they are much faster - will it be audible? Not sure, but I'll let you know when I get them finished. Mundorf make great caps. German made, very high quality but about 3-4x the cost of Elnas and from the specs are capable of delivering huge current. The physical size also works better for my new case (short and fat rather than tall and skinny!!), so I can mount the regulated ps board on top
I thought while I was going to the trouble of rebuilding the cases I would go the whole hogg and change the PS. I've got Tortech in Sydney winding a couple of custom encapsulated toroidal transformers - each one containg three separate dual secondaries to power the reg and unreg amp + protection circuit -to cut down on space used.
I agree on a tight fit - attached is a photo of my current config, all in one case. Don't remember how I managed to pull this off, but the new cases are much bigger, so should be less of a problem.
I also used Caddock resistors throughout and polystyrene/polyprop caps where possible and rather than testing for HV diodes, used higher voltage version instead. I think the electros on board are elna cerafine as well.
Smithy
I've been using Hexfreds for the unreg and reg supply. I haven't tried the IXYS bridges yet, but they are much faster - will it be audible? Not sure, but I'll let you know when I get them finished. Mundorf make great caps. German made, very high quality but about 3-4x the cost of Elnas and from the specs are capable of delivering huge current. The physical size also works better for my new case (short and fat rather than tall and skinny!!), so I can mount the regulated ps board on top
I thought while I was going to the trouble of rebuilding the cases I would go the whole hogg and change the PS. I've got Tortech in Sydney winding a couple of custom encapsulated toroidal transformers - each one containg three separate dual secondaries to power the reg and unreg amp + protection circuit -to cut down on space used.
I agree on a tight fit - attached is a photo of my current config, all in one case. Don't remember how I managed to pull this off, but the new cases are much bigger, so should be less of a problem.
I also used Caddock resistors throughout and polystyrene/polyprop caps where possible and rather than testing for HV diodes, used higher voltage version instead. I think the electros on board are elna cerafine as well.
Smithy
Attachments
Hi Smithy,
That is congestion!!!
Looks that Mundorf caps are even more expensive than Sikorel and your Stochino is a no compromise solution. I use Vishay low noise resistors in audio paths, Milne non-inducive resistors in Zoebel and sources and all caps other than electros are so called non-inductive polypropylenes.
One question about that higher voltage low reverse leakage diode. I could not find any high voltage diode of not much higher recovery time than those specified. So what diodes do you use there? Where one could get them?
And one final question about transformers. I got my two 625VA toroids from Harbuch. Unfortunatelly one is humming too much and should be replaced. It does not have to be encapsulated as it will be in another box - only quiet. Does Tortech do small jobs? It has to be 2x40V under load about 625VA. How much do your trafos cost? Who is the best person to contact there?
cheers,
That is congestion!!!
Looks that Mundorf caps are even more expensive than Sikorel and your Stochino is a no compromise solution. I use Vishay low noise resistors in audio paths, Milne non-inducive resistors in Zoebel and sources and all caps other than electros are so called non-inductive polypropylenes.
One question about that higher voltage low reverse leakage diode. I could not find any high voltage diode of not much higher recovery time than those specified. So what diodes do you use there? Where one could get them?
And one final question about transformers. I got my two 625VA toroids from Harbuch. Unfortunatelly one is humming too much and should be replaced. It does not have to be encapsulated as it will be in another box - only quiet. Does Tortech do small jobs? It has to be 2x40V under load about 625VA. How much do your trafos cost? Who is the best person to contact there?
cheers,