I I'm selling last 4pcb of excellent OME SIGMA-IV lateral mosfet audio reference power amplifier.
PCB Specifications:
After payment PCB Boards will be send next day with tracking number.
Here is picture of boards and schematic:
PCB Specifications:
- 70um copper (2oz)
- 1.6mm pcb thickness
- red solder mask
- white silkscreen
- hasl pads
- pcb drilled
After payment PCB Boards will be send next day with tracking number.
Here is picture of boards and schematic:
PCB Board Layout is using TOSHIBA and SANYO for IPS and VAS, HITACHI lateral mosfet for OPS.
As there is direct replacement for these semiconductors, using schematic that i post above replacement semiconductors are:
2SA970 <=> KSA992
2SA1407 <=> KSA1381
2SC3601 <=> KSC3503
2SK135 <=> ECF10N20 or ECF20N20
2SJ50 <=> ECF10P20 or ECF20P20
Other components is easy available from Mouser, Farnell, Digikey...
Replacement semiconductors have same pinout so it is compatible with this board.
As there is direct replacement for these semiconductors, using schematic that i post above replacement semiconductors are:
2SA970 <=> KSA992
2SA1407 <=> KSA1381
2SC3601 <=> KSC3503
2SK135 <=> ECF10N20 or ECF20N20
2SJ50 <=> ECF10P20 or ECF20P20
Other components is easy available from Mouser, Farnell, Digikey...
Replacement semiconductors have same pinout so it is compatible with this board.
If you like plastic lateral mosfet case then you should design your own board to accept plastic case.
This pcb of OME SIGMA is designed to use TO-3 case lateral mosfets that have a bit more open sound that plastic ones, TO-3 case allows better power disippation handling and it is thermaly coupled (not like on your picture one mosfets on left side and other to right side).
Using lateral mosfet in metal case gives you a better sound and better power disipation handling.
So, there is 2pcbs left, who is interested in buying please send me your country and i will replay to you with final price... boards with shipping costs.
This is one wonderfull lateral mosfet amplifier that sounds like tube amplifier, so if you like tube sound you definitly will be very happy with this amplifier.
This pcb of OME SIGMA is designed to use TO-3 case lateral mosfets that have a bit more open sound that plastic ones, TO-3 case allows better power disippation handling and it is thermaly coupled (not like on your picture one mosfets on left side and other to right side).
Using lateral mosfet in metal case gives you a better sound and better power disipation handling.
So, there is 2pcbs left, who is interested in buying please send me your country and i will replay to you with final price... boards with shipping costs.
This is one wonderfull lateral mosfet amplifier that sounds like tube amplifier, so if you like tube sound you definitly will be very happy with this amplifier.
All this is very confusing to my head. I just wanted to make the best choice in sound quality, but I can't find people willing to help us understand, I don't speak English, I use google translator.
All this is very confusing to my head. I just wanted to make the best choice in sound quality, but I can't find people willing to help us understand, I don't speak English, I use google translator.
✅ Is this a good Goldmund amp?
Every ear hear different sound as every women is beautifull on his own way. So the answer is build amp that you liked and compare with other amplifier. This is fun and diy friendly. Nobody have amplifier that sound best on all ears...so you need to build, test hear and compare. The one your ears like is your reference amplifier.
The decedion is upon you what you like or not
The decedion is upon you what you like or not
I don't like to buy kit from chinese sellers as they sell fake components to archieve low price and attract buyers. If you want to build this goldmund amp buy components from mouser, farnell or digikey and use chinese boards but need large picture of pcb layout because routing for audio needs separate grounds from power and signal.
I've been dragging the dream of having an amplifier for 20 years, I'm 57. Please don't tell me that I'll have to build several and test them.
My monthly income from my work here in Brazil is 283$ (month), some people earn it in an hour, others in a week. But this is my reality. I saved money during these years to fulfill my dream of consumption, I don't have a motorcycle, I don't have a car, I just want a good amplifier to age happily.
Why can't I find a video of "goldmund 29" on the internet?
I really don't feel safe with the Chinese.
I know Silvio...but i try to explain to you that there is no perfect amplifier that is best on world, if that amplifier exist you will already have it at home.
As there is no best women on world, there are beautifull womens in world but not the best looking women, if there exist that most beautifull women on earth you will merry her..this is example.
So answer to your question is...read online comments about sound from other members and decide what you want to buy and build. Nobody can give you solution to say buy this amp and this is high end amplifier, the best on world.
So decidion is upon you.
As there is no best women on world, there are beautifull womens in world but not the best looking women, if there exist that most beautifull women on earth you will merry her..this is example.
So answer to your question is...read online comments about sound from other members and decide what you want to buy and build. Nobody can give you solution to say buy this amp and this is high end amplifier, the best on world.
So decidion is upon you.
Hi, it is not problem to describe but as i say it is your choice what you want to build.
Above post numbers with letters are name of transistors and mosfets that is direct replacement from old semiconductor to new one that is easly available.
My opinion is that sigma is one very nice sounding amplifier that have tube sound, for me it is best amplifier that i have heard, it uses hitachi topology and output lateral mosfets that give tube reference sound.
Of course this is my opinion, other or you can agree with me or not.
Above post numbers with letters are name of transistors and mosfets that is direct replacement from old semiconductor to new one that is easly available.
My opinion is that sigma is one very nice sounding amplifier that have tube sound, for me it is best amplifier that i have heard, it uses hitachi topology and output lateral mosfets that give tube reference sound.
Of course this is my opinion, other or you can agree with me or not.
I trust your good taste, I already told you that I would follow in your footsteps in choosing.