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Old 19th February 2013, 11:03 AM   #1
Tyimo is offline Tyimo  Hungary
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Default Jim's Audio Goldmund Telos 390 clone

Hi!
Is there someone who has already built it?
JFET Input High Speed MOSFET Power Amplifier PCB Telos | eBay

Greets:
Tyimo
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Old 22nd February 2013, 08:13 PM   #2
Cuda is offline Cuda  France
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Same question
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Old 22nd February 2013, 11:17 PM   #3
meltman is offline meltman  United States
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Does anyone know what comprises the output stage in this amplifier?
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Old 23rd February 2013, 11:57 AM   #4
Tyimo is offline Tyimo  Hungary
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Quote:
Does anyone know what comprises the output stage in this amplifier?
Same question too!
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Old 4th March 2013, 12:39 AM   #5
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I have the schematic of these amplifier.
The Telos compare to the Minesis much cheaper amplifier (new price was $14 000).
If I read well the circuit each mosfet has it own driver so it must be matched very well.
The orig used MPSA43/93 but someone replaced in the circuit with 42/92 because that more commonly produced (available).
I was interested on these amp but after people built the Minesis and their result report, I think I stick with my mosfet amplifier.
After Wahab sim outperform the Minesis all do in real life was not tested yet. But soon will be..
Greets G.
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Old 4th March 2013, 05:53 AM   #6
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Goldmund Telos 2500 similar it's schematic. But not C4 & C5. Drivers are 2SC2690A/2SA1220A (very hight Ft) and lower current for Vas (R11 is 220R).
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Old 4th March 2013, 11:53 AM   #7
Cuda is offline Cuda  France
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gaborbela , the left schematic is the Telos from Ebay ?

Is is the same schematic as the nemesis 29 except the R22 and R23 witch are before the driver stage

the right schematis is your mosfet amp ?

Last edited by Cuda; 4th March 2013 at 12:00 PM.
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Old 4th March 2013, 06:25 PM   #8
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Goldmund is offering private sales online of demo and out of production models.
Never seen that before. There sales must be dropping.
https://sales.goldmund.com/
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Old 4th March 2013, 07:34 PM   #9
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Hello Cuda
Yes you right..
These Telos is a older model (I believe no longer in production). I was interested on these amp (clone) to. Someone offered the stuffed PC boards for $240.
Orig. sold for $14 000 so it can not be so bad no to test it specially now you can get the PC boards.
I will see how will perform my amp, on sim easily outperformed the Goldmund M. which was cloned. But we all know between sim and real sound can be huge difference.
In case I'm not satisfied with my amp probably I'll test these GM clone.
Since I have the semis for..
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Old 5th March 2013, 03:28 AM   #10
fab is offline fab  Canada
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I know peoples who have successfully built an amp using that pcb and parts list and it sounded fine. However I would think there could be some issues in some case where the MOSFET have a very high VGSoff where the resulting bias would be too low. There is no procedure provided to the builder to adjust specifically for a target bias. I am pretty sure that the real Goldmund amps have all similar bias... But what is it?

Fab

Last edited by fab; 5th March 2013 at 03:31 AM.
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