The Very Best Amplifier I Have Ever Heard!!!!

[Nikos]

Re: Golmund clone

Goldmund clone box
First quick setup Results:first listening amazing sound inside the box. No hum at all, zero dc offset. detail and soft amplifier neutral sound !!!!
2x500VA /2X50V .Front end power supply +- 81V.
AND SOMETHING BAD REALY BAD I MUST MAKE ANOTHER BOX.

 

[mrsavage]

Purchase four (4) of more PCB's

I would like to purchase four (4) of these PCB's. Can we startup this Group
Buy again? Or can you supply me the Gerbers Files for this PCB? I could
then order my own PCB's. Let me know.

 

[Machina]

Ok im fighting with this amp again. I bought and tryed 2N5565, 25$ four two pieces. No big change, normal voltage Vcc/Vee 63V/61V. Same schematic posted http://www.diyaudio.com/forums/soli...lifier-i-have-ever-heard-241.html#post3935555
Only when i replaced R16 180R, R17/18 390R. Voltage jumps to 70V max on Vcc, Vee 68V. Vas stage is very hot, specially T7/8. Voltages between R1/2 2,97V and 2,98V. R3/4 75mV/74mV.





Note that its not ideal wave.

Dc out jumps from allmost 0 to 22mV.

 

[Nikos]

Ok im fighting with this amp again. I bought and tryed 2N5565, 25$ four two pieces. No big change, normal voltage Vcc/Vee 63V/61V. Same schematic posted http://www.diyaudio.com/forums/soli...lifier-i-have-ever-heard-241.html#post3935555
Only when i replaced R16 180R, R17/18 390R. Voltage jumps to 70V max on Vcc, Vee 68V. Vas stage is very hot, specially T7/8. Voltages between R1/2 2,97V and 2,98V. R3/4 75mV/74mV.
View attachment 425308

View attachment 425309

View attachment 425310
Note that its not ideal wave.
View attachment 425311
Dc out jumps from allmost 0 to 22mV.

Can you measure the voltage on R16=180Ω?
Nikos

 

[Nikos]

Re: Golmund clone

Golmund clone box

 

[Machina]

Ok amplifier can behave strangely. Sometimes voltage can rise to about 99V Vcc/Vee, dc is almost 55V, behaving like T7/8 is not working, because its no voltage on R16 , and can back to normal working area, when touching source resistor R3/R4? On R1/R2 177mV/97mV, R3 68mV & R4 83mV. On output scope shows nothing, just voltage.
When working R16 2.09V, R17 2,19V and R18 2,25V.
Yes it changes when i try to measure voltage on R3/R4!!

 

[Nikos]

Ok amplifier can behave strangely. Sometimes voltage can rise to about 99V Vcc/Vee, dc is almost 55V, behaving like T7/8 is not working, because its no voltage on R16 , and can back to normal working area, when touching source resistor R3/R4? On R1/R2 177mV/97mV, R3 68mV & R4 83mV. On output scope shows nothing, just voltage.
When working R16 2.09V, R17 2,19V and R18 2,25V.
Yes it changes when i try to measure voltage on R3/R4!!

Mystery
can you put BD250C-249C?

 

[Nikos]

GREECE ONLY GREECE
NEVER DIE!!

 

[Machina]

This is not the fault of voltage stabilizer.

 

[Machina]

Ok I'm sick of this amplifier not working for me.

 

[Nikos]

Re: Golmund clone

Golmund clone box

 

[AndrewT]

The left and middle have a "fog", with lots of analogue "graininess".
The right pic has some evidence in the far right top corner.

What causes this effect?

Low light?
Bright light out of pic?

 

[Nikos]

Hi Mr Andrew
Any advice for good amp pictures ?
Of the most cases your opinion is acceptable.

 

[AndrewT]

"daylight" rather than artificial light is a big help.
Direct sunlight creates deep shadows with no detail.
Rest the camera on a support. Doesn't have to be a tripod.

 

[Nikos]

All these photos are from my old mobile LG990i
My old camera FM2 NIKON still shooting.. All time clasic. All on my hands
Now for the amp have you say something ?....
Nikos

 

[AndrewT]

I have said enough about this range of amplifiers.

 

[Ian Finch]

The question is what you think of the amplifier. Does the sound quality live up to that world beating "The very best amplifier I have ever heard" title?

If you were looking for comments on the build, I'd post this in the sticky thread "Post your solid state pics here". It seems quite a good build and interesting by the way, in that you appear to have milled rather than etched the PCB or that just due to the source pattern?

 

[Nikos]

Re: Golmund clone

Golmund clone box

 

[Nikos]

Re: Golmund clone

Fine tuning step by step inside the box
test 100khz -200khz with 8Ω load = 44.7 V RMS before clip 126 pk-pk = 250 W
1khz with 1mf - 8Ω
10khz with 1mf - 8Ω
20khz with 1mf - 8Ω
90 mA per mosfet.

 

[Nikos]

Golmund clone

The question is what you think of the amplifier. Does the sound quality live up to that world beating "The very best amplifier I have ever heard" title?

If you were looking for comments on the build, I'd post this in the sticky thread "Post your solid state pics here". It seems quite a good build and interesting by the way, in that you appear to have milled rather than etched the PCB or that just due to the source pattern?

Ian Finch
http://www.diyaudio.com/forums/soli...lifier-i-have-ever-heard-240.html#post3897811