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Old 10th December 2010, 06:27 PM   #651
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Hello

With 200VA transformer it will be OK.
You will lose 2-3V when loaded may be 4V , don't forget it is a Class A amp! Depend on the bias how high you set it up...
I used 300VA transformer and it was warm my transformer.
The amp bias was over 1A in cold, after1 hour or so 1.2 - 1.3A/ channel..

Greetings

Last edited by gaborbela; 10th December 2010 at 06:33 PM.
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Old 10th December 2010, 06:36 PM   #652
osscar is offline osscar  Latvia
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Thanks, I hope so, i will try to load it tomorrow - i still need to get 100R and 220R trim pots for tests - 470R i have but it seems for me to big for GR grade Jfets. I think that the higher voltage as usual -due low voltage drop diodes in rectifier. With standard bridge voltage is lower.
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Old 10th December 2010, 07:05 PM   #653
neazoi is offline neazoi  Greece
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Quote:
Originally Posted by osscar View Post
modu

Look here !

Just checked PSU voltage- 16V without load, seems a bit too high.
I like this company! they accept paypal too. the REAL good ones have 250Euros, this is too much! but the smaller ones are wuite affordable
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Old 10th December 2010, 07:16 PM   #654
osscar is offline osscar  Latvia
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Yes, in my country it is difficult to find a suitable radiators for class A.
So count aluminum radiator prices + Aluminum and auux.materials (drills, sanding paper etc)- just over 100EUR.
This time I decided to buy
Shipping was very fast, but I forgot to order a perforated chassis ...another option - par-metal.com cases from ebay, but delivery to Europe more expensive.
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Old 11th December 2010, 12:07 AM   #655
neazoi is offline neazoi  Greece
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I feel like it is time to post some updated photos of mine.

Amplifier was setup on 500mW drom and a little bit more when heated
Is it class-A or is it too low that drops into AB??

Here are the photos with my homemade box too. The LED is silicon carbide and yes it is dim

The I/O connections (male ones) are not good yet
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File Type: jpg DSC04673.JPG (25.0 KB, 618 views)
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Old 11th December 2010, 12:49 AM   #656
bluevas is online now bluevas  Indonesia
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Hello guys, i made hiraga with 12 volt and using original components only i using BL grade for jfets with 390 ohm resistor instead 1k ohm. do we have to match every transistor? i never have matched transistor and my le monstre reach over 1 ampere bias and i need to reduce because i have no good heatsinks. what should i do to reduce? should i change the jeft to 2SK246 GR or reduce the 390 ohm resistor? Any suggestions? thank you guys.
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Old 11th December 2010, 01:09 AM   #657
neazoi is offline neazoi  Greece
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Quote:
Originally Posted by bluevas View Post
Hello guys, i made hiraga with 12 volt and using original components only i using BL grade for jfets with 390 ohm resistor instead 1k ohm. do we have to match every transistor? i never have matched transistor and my le monstre reach over 1 ampere bias and i need to reduce because i have no good heatsinks. what should i do to reduce? should i change the jeft to 2SK246 GR or reduce the 390 ohm resistor? Any suggestions? thank you guys.
As previously suggested you only have to alter the 1K restistor at the base of the driver transistors to adjust the bias. See here for the alignment process I did. Le monstre
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Old 18th December 2010, 08:24 PM   #658
osscar is offline osscar  Latvia
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Tonight I launched monster in test mode :

Click the image to open in full size.

ISC outputs, GR grade Jfets - still don't have pot , so i use 2x 100R and 1K for bias - its around 0.4Amps.

Click the image to open in full size.
square wave 20Khz

Click the image to open in full size.
clipping

About monster sound- don't know yet, but if there is such osciologram, I suppose that sounds
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Old 22nd December 2010, 06:03 PM   #659
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Did I get it right???

I read through it, and extracted the following advise:

1. Get original transistors
2. Use 100 Ohm trimpot
3. For JFets use V type not GR or BL, because V is replacement for Y
4. If Current in output Stage does not fit, change resistors on the collectors of cascode transistors
5. Desired outpot stage current is 800mA (for original design)

Open question: Which board should I take???

The one used at:

Audio Constructions

Which is the size of the PCB (If I have to print, I need the scale factor...)

Regs, Dirk
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Old 22nd December 2010, 07:24 PM   #660
osscar is offline osscar  Latvia
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Hi,
You can find in this thread PCB pdf file and print it at 1:1. Do not forget to turn around the FETs. PCB size was 5x6 cm if i not mistaken. I made a little bigger size from one side to have a place 4 screws. You can also use other transistors, only then you will need to experiment with cascode resistors and pot ..Bias approx around 0,5-0.6A if i understood correctly.
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