Gamut D200 clone !!!

[MikeBettinger]

Hi Analog guy,

I dont understand your posts. Are the pics a clone or the real deal?

seeya

I'm afraid I don't understand either. Is the amplifier shown in the pictures posted in posts 5 through 17 the real Gamut (I'm assuming) or the clone? Is the smaller drive board posted 18 the clone PCB that you purchased to build a clone amp? Or am I confused?

Thanks Mike.

 

[ANALOG GUY]

Only post#18

Only post#18 is cloned version
I used it with Aleph P1.7 in balanced mode it's OK, maybe I think Borbely EB2000/402 + Gamut D200 is a better choice.

Thanks
analog guy

 

[jacco vermeulen]

A.G.,

which power mosfets did you use with your clone main board ?

 

[ANALOG GUY]

Many type in collection

LOW COST : IRFP044N, IRFP240, IRFP150
HIGH COST : GT20D101 in parallel

When trimming VGS I have to set mini distrotion (at least) on junction of quasi complementary.

 

[jacco vermeulen]

Re: Many type in collection

LOW COST : IRFP044N, IRFP240, IRFP150
HIGH COST : GT20D101 in parallel

Is the single pair output stage not what makes it a Gamut ?

 

[Holger Barske]

I think you guys have read this: http://www.gamutaudio.com/faq.htm
Answers some questions.
And, as having reviewed a D200 in 2000 or 2001, I remember one thing for sure: it certainly is not a PWM amplifier. And: Ole Lund Christensen told me that the use of large single power MosFets as output stage ist vital for this amp.

 

[ANALOG GUY]

Sorry, I'm wrong

In post#4, I told about PWM but It's only super quasi complementaty amplifier.

Gamut used power module mosfet with PWM technology.

I'll contact Mr.Koran to explain this schematic for me but I afraid of publication method on web (Patent Pending), I'm only studying GAMUT operating and used for home entertainment only.

Regard
analog guy

 

[courage]

Interesting thread so far.

Any of you guys know a source for spice models for the BUZ900X4S & BUZ905X4S?

Also noticed that data-sheets are preliminary, but given the fact that these Mosfets are already used in commercial amplifiers I assume more detailed data-sheets are available?

Thanks in advance.

 

[ANALOG GUY]

My new miner change

I paid for new GAMUT's Cloned PCB from Mr.Koran again for 250USD , It'll arrive to me on 2-3 days after now
It's included power IGBT ?!? not single phase power mosfet ?!?

Now I used Mission 782SE SPK but I think Mission is very small for new amplifier, any suggestion about new SPK ?

Thanks
analog guy

 

[jacco vermeulen]

new GAMUT's Cloned PCB from Mr.Koran

You should call him Mr. Clonan !
Why all these variations and not try the real thing, A.G. ?

 

[Nelson Pass]

Any of you guys know a source for spice models for the BUZ900X4S & BUZ905X4S?

Since the data sheets show 4 parallel MOSFET chips inside
these devices, how do we justify the notion that the amplifier
would have a single device output stage?

 

[jacco vermeulen]

Mr. Pass,

i recall you mentioning you tried similar high power mosfet packages from American manufacturers on some of your SE designs.
Also that matching of the 4 mosfets in the device is less stringent than suggested by you for an Aleph output stage.

Your last post on the Magnatecs suggests encore that they are a convenient way of spending a lot more money, without an additional bonus ?

 

[TomWaits]

More output for Nelson Pass?

Obvious upgrade or not? O.k. we'll ignore these holes in the board? Were the engineers having a battle? It seems someone wanted 4 outputs paralleled

 

[destroyer X]

Analog guy, thank you by the nice thread, and God bless your fingers

with this nice hability to produce good images.

I am enjoying very much your thread.

regards,

Carlos

 

[courage]

Since the data sheets show 4 parallel MOSFET chips inside these devices, how do we justify the notion that the amplifier would have a single device output stage?

You've got a point there Nelson. Actually two of these devices are used per side in - as I understood - a push-pull configuration.

 

[ANALOG GUY]

Answer is...
1. Balanced/RCA Input
2. Opamp diff for voltage gain
3. Phase splitter separated each phase
3.1 Phase splitter (+)
3.1.1 Amplifier with mini current amplifier to drive single mosfet as a speaker (single mosfet = 8 ohms speaker)
3.2 Phase splitter (-)
3.2.1 Amplifier with mini current amplifier to drive single mosfet as a speaker (single mosfet = 8 ohms speaker)
4. Combine (+) and (-) output from each power mosfet together as AlephX and Ayre V5X output concept (Bridge Amp)
5.Listen to it !!! (Now I called it Gamut D200X)

I received email from Mr.Koran but he don't send me a schematic. OK, I see it's a secret !!!
Do you believe me ? he he he

 

[Nelson Pass]

i recall you mentioning you tried similar high power mosfet packages from American manufacturers on some of your SE designs.
Also that matching of the 4 mosfets in the device is less stringent than suggested by you for an Aleph output stage.

I have some of the IR equivalents, but unfortunately these
modules being made for switching, the manufacturers are under
no constraint to match the 4 internal parts.

Mostly likely they are from the same lot code, but this does not
ensure Vgs matching and makes it more risky to use them in
linear circuits, where one device can hog the dissipation.

Given that, it's much cheaper and more reliable to match four
devices and give each it's own Source resistance.

 

[ANALOG GUY]

Yes,it's an upgrade

Obvious upgrade or not? O.k. we'll ignore these holes in the board? Were the engineers having a battle? It seems someone wanted 4 outputs paralleled

Yes, I think it's an upgrade but if you have only 1 biggest mosfet you don't need parallel mosfet together.

200WRMS/CH enough for me !!!

Thanks
analog guy

 

[ANALOG GUY]

Yeah !!! I received schematic !!!

Mr.Koran had sent me a schematic for Gamut D200 MKIII, But he doesn't share me a power supply schematic.

Notice : Its operation in my posted #36
Thanks for many question from email

ANALOG GUY

 

[kimschips]

Thank you so much Analog Guy!!

Is it possible to see component values?

Thanks again!

Kim