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Old 23rd December 2010, 09:58 AM   #661
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Hi Osscar,

seems I've overlooked this. Could you send it to me per mail???

V type for JFets is best suited?

Regs, Dirk

Looking forward to get your sound impressions...
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Old 23rd December 2010, 10:28 AM   #662
osscar is offline osscar  Latvia
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hi,
Look again attached PDF file!

i will tell about the sound after few days- currently working with enclosure.


regards,

Oskars
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File Type: pdf lemonstreorgtransistors.pdf (48.5 KB, 323 views)
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Old 23rd December 2010, 12:17 PM   #663
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Thanks!!!!!!!!!!!!!!!
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Old 23rd December 2010, 04:15 PM   #664
jouff is offline jouff  Reunion
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Default JFet's grade

Quote:
Originally Posted by HVfanatic View Post
Hi Osscar,

V type for JFets is best suited?
No, they aren't ! That strange idea was emitted on this thread because one thought it was a printing mistake between "Y" and "V" !!
It is not.
"Y" grade does exist : i'have got some.
Their Idss is very low, so the closer grade is "GR". You will perhaps have to use a 200ohm trimpot in order to get a 1.2 - 1.5 mA current in the cascode.
You can find easily Toshiba 2SJ74GR/2SK170GR singled or matched on the web.

If you need some other info on trans for this amp, just let me know.
And don't forget the first class passive power supply !

Rgds
PYJ
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Old 26th December 2010, 09:24 AM   #665
osscar is offline osscar  Latvia
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Today Just finished my Le monstre, pots still don't delivered to me, so i soldered instead of pot to fixed resistors - for one channel 2x680R - works fine - bias 0.7A DC offset - in range of 10mV. Other channel - 2x 100R -bias around 0.7A , DC offset - 150mV , i will solder pots when received them.
Supply voltage around 13.6V with load.
Now will be listening tests.

Thanks to all DIYers from this thread - Lineup, Gaborela, Nezoi , and others who create PCB and explain things. And also thank you Mr. Hiraga

Inform you about sound later

Click the image to open in full size.

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Old 26th December 2010, 10:25 AM   #666
osscar is offline osscar  Latvia
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sorry - source resistors 2x68R.
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Old 27th December 2010, 06:05 PM   #667
osscar is offline osscar  Latvia
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After a two-night listening, I can tell you something, compared with F5:

Monstre have more gain;
it is not as sharp as F5;
Detailed - like F5;
Bass - very good, but more rounded then in F5;
Microynamics - very good.
I really like the classical and instrumental music with this amp and it not so hot like F5.
Le monstre sounds good at very low levels also...

I am a bit confused - different they sounds, but at the same time the same in some way
I like electronic music with F5 and also Le monstre sounds very good.
In winter i will use F5 -in summer - Monstre
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Last edited by osscar; 27th December 2010 at 06:08 PM.
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Old 27th December 2010, 06:35 PM   #668
wahab is offline wahab  Algeria
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Very nice case and build , Osscar.
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Old 27th December 2010, 06:40 PM   #669
osscar is offline osscar  Latvia
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Tnx Wahab!

I myself still wonder - how much it is - 8W
its not sounding but singing amp
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Old 27th December 2010, 07:37 PM   #670
masag1 is offline masag1  Germany
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Default Hiraga 8 Watt Pcb

My Friend Klaus did a very nice Pcb for me.

Look for the short signal traces!

Use a Silver Mica for feedback compensation, 1,5nF to 2nF, watch the scope.

You can tray to test Bulk Foil or Tantal-R or Riken Resistor in the feedback path, you can trimm the sound with the 220R resistor.

With kind regards

SAm
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