Do you know this?
Yes. What's in it? I'm an engineer in other engineering fields but not electronics. I know only the basic of electronics, don't know about amplifier design.
Like I build the other amps
. Why asking that? When I had time I will hunt the specified transistors I don't have at hand, but meanwhile I will use parts that I have on hand. Will use my stochino power supplyBut the critical part is, I will build it "crazier" than even the Goldmund engineers. I think there is the secret.
Like I build the other amps
But the critical part is, I will build it "crazier" than even the Goldmund engineers. I think there is the secret.
There is the secret 'how to get gold from iron', I think MERLIN work for 'Goldmund'
Attachments
No, I haven't heard any Goldmund. And I will build any amplifier that is considered "better" by "anyone". Of course better is a subjective thing here. That's why I have learn to relate what I hear with what I see in the schematic, and also to find out whether I and the designer share the same "understanding" about sound perception, so to avoid building too many amps.
Of course, I will build your design if you dare to share your BEST design, even though I cannot understand why such schematic should sound good for example. Just say it is your best design, best sounding amplifier you have ever heard, then I will be tempted to build it (of course I heard about that Pioneer hehe).
Any expert that likes the sound of a mosfet might share the same preference as I'm. Some other cannot understand why these lateral mosfet are liked by others for example. Some don't understand why some have to have high slew rate amp. Older Hitachi laterals just sound better than Hitachi laterals I found after 2000 (isn't that a good joke
).By having lateral mosfet with minimum of 100V/us slew rate, I'm expecting to have a "musical" and "fast" amplifier. "Fast" is a subjective term that is relatively easy to understand, and easier to relate theoretically, but "musical" is more fuzzy. It is easy to have a "fast" amplifier that is not musical. It is also easy to have a musical amplifier that is not fast.
When I say "fast", basically I refer to what I hear, not physical metrics. When I relate to transistors, this "speed" often has relationship with gm, fT, and when I relate to schematic, it is slew rate. To get a high slew rate from a low gm transistor like lateral mosfet, isn't that a challenge?
Back to "fast" versus "musical", many can hear the good aspects of fast amplifier, especially the dynamics capability...
High power amplifier just tend to be more dynamic, but often less musical. That's why I limit my power requirement to minimum and close to 60W. Many of you just happy with 100-250W amplifier. But those Goldmund engineers (like I read from papers you all have posted) said that they have difficulty to keep the quality of a smaller amp into the higher power one. They lied or not, I think we share the same "understanding" about the perception of sound, that's why I wanted to try this design (actually I wanted to build one in a night before I know it is a Goldmund but after I knew, I slowed down for reason I believe you know
).Amplifier is not everything for me. Loudspeaker is the most important one. I want an amplifier that match with a specific speaker I have at hand. I have built some amplifiers, and each of them has certain quality that is not available in the other. Having one amplifier that has everything I like, that's my never ending projects. But I'll keep any amp that I CAN LIVE WITH, even if it has many limitations.
Jay,
Go to see thread: http://www.diyaudio.com/forums/solid-state/165024-best-amplifier-world.html
Nelson: "This being the entertainment business, There is no
such thing as the best amplifier, just as there is no
best wine or best car.
There is a best wife, however, but she is taken".
I say: there is best wife - The Next One.
My favorite amp this days is SR50 from post #24 in thread: http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-3.html
Regards
Go to see thread: http://www.diyaudio.com/forums/solid-state/165024-best-amplifier-world.html
Nelson: "This being the entertainment business, There is no
such thing as the best amplifier, just as there is no
best wine or best car.
There is a best wife, however, but she is taken".
I say: there is best wife - The Next One.
My favorite amp this days is SR50 from post #24 in thread: http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-3.html
Regards
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Why are you pointing me to that thread? To tell me that there's no such thing as best amplifier? Hehehe don't worry, I have been around long enough to experience dejavues...
I'm not searching for the best amplifier. I have been there. I found it mostly from loudspeaker design. Amplifier building is just a hobby. But I just want to build those considered the best by others... just to limit the amount of the project. More than 80% of my amps are mono
I know there's problem in perceiving the quality of a mono amp, but what the hell, it's just a hobby...Hey, even if I'm not a bipolar guy, I have been planning to build the SR50. It is not coincident that I didn't recognize your F100 but had an eye on the SR50. The high voltage power supply is also interesting, I have to try that one. Expensive bipolars for a power supply? You must be joking
Why are you pointing me to that thread? To tell me that there's no such thing as best amplifier? Hehehe don't worry, I have been around long enough to experience dejavues...
I'm not searching for the best amplifier. I have been there. I found it mostly from loudspeaker design. Amplifier building is just a hobby. But I just want to build those considered the best by others... just to limit the amount of the project. More than 80% of my amps are mono
Hey, even if I'm not a bipolar guy, I have been planning to build the SR50. It is not coincident that I didn't recognize your F100 but had an eye on the SR50. The high voltage power supply is also interesting, I have to try that one. Expensive bipolars for a power supply? You must be joking
You can use any available bipolars for PSU
I build many amps for test, and I share only this I like. There is DIY versions (not best versions) with available parts.Regards
Hi Krisfr,
I can view the file much clearer now but there seems to be still some error in the content.
I have enclosed the op-amp module with a red rect. Kindly turn D7 +90deg so it joins R32 before 'leaving' the 'module'. Cannot find C26 in the original schematic.
Also add connection between 7 of module to C18, R24
Still trying to check other stuff. I will also try to make a BOM of it.
I can view the file much clearer now but there seems to be still some error in the content.
I have enclosed the op-amp module with a red rect. Kindly turn D7 +90deg so it joins R32 before 'leaving' the 'module'. Cannot find C26 in the original schematic.
Also add connection between 7 of module to C18, R24
Still trying to check other stuff. I will also try to make a BOM of it.
Attachments
Hold on I can gen a BOM
Do you have KiCad?
I can send you the schematic and you can edit it as you like, add and or remove as to what ever the consensus is...I am willing to share this with ANYONE...
I know I don't know everything about this amp and I am willing to learn and share.
I don't know if I will take the schematic to the board layout portion of the KICAD. My brain is still stinging from the schematic layout assault.
Suggestions are wanted and welcome.
I am too old not to be comfortable in my own skin and self confident enough to accept criticism without smarting, therefore I learn from my mistakes. INSULTS are not acceptable though. So take me to Amplifier school, I will tell you what I think about what you shared if I think it is warranted.
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How about a VOTE
New threads called
HITACHI Improved Design = HID
'Goldmund' is just another HITACHI based amplifier, no need for new threads, there is already threads for similar designs.
I had NO intentions of thread "hijacking" , or telling people not to build this design , I just did not feel this particular design was too DIY "friendly". Jay stated he would use parts "he had around" , but this design is much more picky than that. Speaking of this design , I did simulate it and with 22pF compensation, it was still fast and a LOT more stable. Also, there are 3 sourcings for these devices (MPSA92/42 -ON semi ,fairchild , and central semi) , all are different "creatures" with different Cob's , gains , and fab processes. This would also present a problem in cloning the original Goldmund.
The available models for the MPSA92/42 are dubious at best and might not fully reflect the final performance. This holds true for the whole Goldmund circuit's sourcing ... VERY critical.One might say "he just simulated it" ... I would agree, but by actually producing many things I simulate , I at least can come to a close approximation. Also , (in simulation) , the FFT of the original goldmund is very close to the symasym type high order harmonics reflecting the similarities in topology.
I was thinking of creating a output board to do both laterals and verticals , so everyone could actually use "what they had around".
At that point , the voltage stage could be independently refined. Speaking of voltage stages , I have subjectively auditioned ALL the variants of the hitachi scheme ranging from the simplest (goldmund/diode based VAS CM) to a cascoded emitter follower based topology with a gain of 110db. There is no "merlin magic" , just matching the part with it's best compensation to bring forth the best sound ... all just time and patience ... and more time ... (ascertain reliability , stability) this is diy , we don't have to rush a design out the door to the market in a timeframe. OS
Without listen we cannot say that Ostripper
You imagine this or that, based on your experience...your skills..you belief, your calculations... and you suppose things.....yep... alike all of us...but......
Reality is another stuff.
I would not say anything without listen first...well.... people is different.... i have enormous respect by the reality...and very low respect about theories and suppositions....but people goes travelling in this long horizontal cursor..from the rigth to left....i am half way in the reality side...... ahahahahahah!... i think so....who knows.
I have build so special things...so nice and theorically perfect, made by wise and skilled guys and gave a shot on the board so awfull result the sound reproduction.... that i would not be surprised if this one is really "the best wide world amplifier" or the "worst lemmon on earth"
regards,
Carlos
You imagine this or that, based on your experience...your skills..you belief, your calculations... and you suppose things.....yep... alike all of us...but......
Reality is another stuff.
I would not say anything without listen first...well.... people is different.... i have enormous respect by the reality...and very low respect about theories and suppositions....but people goes travelling in this long horizontal cursor..from the rigth to left....i am half way in the reality side...... ahahahahahah!... i think so....who knows.
I have build so special things...so nice and theorically perfect, made by wise and skilled guys and gave a shot on the board so awfull result the sound reproduction.... that i would not be surprised if this one is really "the best wide world amplifier" or the "worst lemmon on earth"
regards,
Carlos
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