Hiraga "le monstre"

[HVfanatic]

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...

[osscar]

hi,
Look again attached PDF file!

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


regards,

Oskars

[HVfanatic]

Thanks!!!!!!!!!!!!!!!

[jouff]

Originally Posted by HVfanatic

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

[osscar]

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

[osscar]

sorry - source resistors 2x68R.

[osscar]

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

[wahab]

Very nice case and build , Osscar.

[osscar]

Tnx Wahab!

I myself still wonder - how much it is - 8W
its not sounding but singing amp

[masag1]

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