Clone Goldmund Amplifier

[hien.t.nguyen]

values on the gate resistors: 820 ohm for N channel and 470 ohm for P channel with lateral mosfet is 10N20+10P20

 

[dungdochi1978]

which class this amp working on?
only high power ? quality? distortion?noisy? bandwith?...

 

[hien.t.nguyen]

Original Metic 3 used driver MJE340+350

 

[hien.t.nguyen]

which class this amp working on?
only high power ? quality? distortion?noisy? bandwith?...

Amplifier working in class AB
Harmonic Distortion < 0.001%
Noise 116dB with intergrated amplifier
Noise 122dB with power amplifier
bandwith
10Hz-70Khz: +/-0.1dB
1Hz-200khZ: +/-1dB

capacity depends on model myclone

 

[tommy1000]

Original Metic 3 used driver MJE340+350

Wow look what turns up after four months! Thank you!
Can you show us the input stage also?
I think that the CCS is different from the MM9.2?
And one OPA134?

 

[hien.t.nguyen]

Yes,i can

CCS used ZTX694B

 

[hien.t.nguyen]

Your picture is this chanel,i see R72,C31 in the your picture

 

[tommy1000]

Any change in this parts?

 

[hien.t.nguyen]

Wow look what turns up after four months! Thank you!
Can you show us the input stage also?
I think that the CCS is different from the MM9.2?
And one OPA134?

Can you show more pictures? i want to see layout original

 

[hien.t.nguyen]

Any change in this parts?

OK,it is R56 = 33K and R62 = 10K => Vb = (10/43)xVcc

Your post #108 is schematic Goldmund module job4,it used 56K and 33K,lateral mosfet output is K1058+J162,I have also this schematic but I dont know it use in what model Goldmund?

 

[tommy1000]

The pictures I have is from here:
GOLDMUND Metis ƒVƒŠ�[ƒY‚ð“O’ê‰ð–U‚·‚é�I�I -otaiaudio-
?ánh giá preampli và ampli Goldmund Metis 2 và 3 | Qu?n Tr? M?ng - QuanTriMang.com

Hope this helps.

 

[hien.t.nguyen]

The pictures I have is from here:
GOLDMUND Metis ƒVƒŠ�[ƒY‚ð“O’ê‰ð–U‚·‚é�I�I -otaiaudio-
?ánh giá preampli và ampli Goldmund Metis 2 và 3 | Qu?n Tr? M?ng - QuanTriMang.com

Hope this helps.

Thank you share link,I know Vietnamese

 

[tommy1000]

OK,it is R56 = 33K and R62 = 10K => Vb = (10/43)xVcc

Your post #108 is schematic Goldmund module job4,it used 56K and 33K,lateral mosfet output is K1058+J162,I have also this schematic but I dont know it use in what model Goldmund?

It is from Mimesis 330.

 

[tommy1000]

What about output DC and oscillation protection?
Controlled by the CPU? or is it analoge?

 

[hien.t.nguyen]

What about output DC and oscillation protection?
Controlled by the CPU? or is it analoge?

No,CPU control Volume(PGA2310 or PGA2311) and selector input (by relay) + display.

Protect DC and Oscillation,... by analoge.

Output Current is not protection.

 

[hien.t.nguyen]

It is from Mimesis 330.

I think JFET input will hot because
Vc= (33/(56+33)xVcc)-0.6 # 26V,
I2c = 2mA x 2 unit = 4mA
P2c= 112mW => Hot => have DC at output.

 

[hien.t.nguyen]

Chinese clone have use heatsink for dual jfet,can they use schematic M330?

Link

Ö±¿Ì¸ßÎÄ GOLDMUND 29ºó¼¶ ¹¦·ÅÌ×¼þ-ÌÔ±¦Íø

 

[tommy1000]

I see what you mean. They will run hot. But they are rated at 650 mW total. (the genuine 2N5565). Maximum junction temperature is 150 degrees C.
Chinese clone is Mimesis 29, using MPSA for VAS and driver. They usually have a DC adjust but this one don't.

 

[hien.t.nguyen]

I see what you mean. They will run hot. But they are rated at 650 mW total. (the genuine 2N5565). Maximum junction temperature is 150 degrees C.
Chinese clone is Mimesis 29, using MPSA for VAS and driver. They usually have a DC adjust but this one don't.

Have a few different of models at the cascode stage and the Vas,
- schematic M3
Cascode stage
Iccs= 4mA,Vc= (10/43)x60-0.6 # 13V
Pc(2N5565) = 53mW
Vas
Ic(vas) = (2x1.5-0.6)/367.5/2 = 3.25mA
Pc = 220mW/1BJT


- Schematic M330( job4)
Cascode stage
Iccs=4mA,Vc= (33/89)x60-0.6 # 22V
Pc(2N5565) = 86mW
Vas
Ic(vas) = 4.66mA
Pc = 330mW/1BJT

- Schematic T5000
Cascode stage
Iccs=4mA,Vc=5.1-0.6 = 4.5V
Pc(2N5565) = 18mW
Vas
Ic(vas) = 4.66mA
Pc = 330mW/1BJT

 

[tommy1000]

Yes, they have different configurations. The schematics all have revisions so if those revisions ever was used we do not now. The MPSA42/92 are rated at 625 mW so I think it is not a problem.