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Old 1st February 2011, 08:52 PM   #711
a.wayne is offline a.wayne  United States
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Oscar , what was the DF of the Monstre 10? What is the F5 DF ..... ?
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Old 2nd February 2011, 06:51 AM   #712
osscar is offline osscar  Latvia
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If I not mistaken, the standard F5 DF is 60 or something like that.
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Old 24th February 2011, 02:40 PM   #713
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I made some changes to my Le Monstre (such as a 'star ground' and a hybrid powersupply.). I have the original transistors bought at W. Walthers's shop in Paris: (noir et vert).

Reason: I noticed the output resistors of 1 ohm were taking more than 1 Amp (1,15 and 1,20 Amp) from 750 mA I had a fifteen ago. I parralled extra resistors to get 840 ohms on the cascodes (from previous 910) and this gave 950 mA bias. Not the big reduction I had hoped for.

So I decided to change things a bit.
My builds:
divers 02'11 2353Kerst 2010.jpg
I changed the transformer, now a Metalimphy 214 (bifilar wound!), used a new 40V/30Amp bridge. And I inserted a current sink (TIP142/TL431) along the power supply. Plus I added a set of 100.000.000 microfarad "super capa's" from NEC, these are specially advised by Hiraga.

Then I noticed a strange effect. The bias current dropped. Bias current is now 750 mA in cold state and 850 hot. Power supply is both plus and minus 12,99. Conclusion: the power supply matters.

Distortion:
divers 02'11 2357Kerst 2010.jpg
The amp shows a nice 2nd Harmonic at just 2,05 V RMS, with a 8 ohms load, of less than 0,2%.
Without a load it is 2,45 volt RMS. Now Osscar, this will allow you to calculate a Damping Factor (DF) calculation with this configuration . . .

The amp will give 7,2 V RMS on 8 ohms just before clipping. The distortion is then still about 1% - but now complex. With a higher bias of 1 amp and a slightly higher voltage of 13,7 volt I got a max. 7,8 Volt output.

Bandwidth: without a load: from less than 1 Hz to above 500 kHz; with load (non inductive) it is up to more than 350 kHz, but I have to reduce output to 4 volt RMS to see the upper limit.

Sound:
I notice very subtle vocals on my 'nasty and difficult' Quad ESL.

albert
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Old 24th February 2011, 10:02 PM   #714
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Thanks for sharing these results with us Al,

Explaining some of the mysteries of Le monstre

-Dan
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Old 25th February 2011, 08:37 AM   #715
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I took the time to drop the values in the DF formula
DF = V1 / (V2-V1)
V1 = output voltage of the amplifier with load resistor connected (2,45V)
V2 = output voltage of amplifier without a load (2,05V).
This is a very solid 1,0 at 8 ohms. And it sounds gorgeous!!!

PS - You can see the TIP146 on the housing in the second picture. It gets luke warm. Is there interest in the shunted power supply I developed?

albert
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Old 25th February 2011, 09:27 AM   #716
es44 is offline es44  Denmark
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Quote:
Originally Posted by triode_al View Post
Plus I added a set of 100.000.000 microfarad "super capa's" from NEC, these are specially advised by Hiraga.
Sorry, just out of curiosity. Do You REALLY mean 100 Farad ? I've never seen one of these.
In cars, i have often seen a few Farads hooked up close to these huge amplifiers all those young guys use to destroy their hearing.
Best regards
Ebbe
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Old 25th February 2011, 10:35 AM   #717
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Quote:
Originally Posted by es44 View Post
Sorry, just out of curiosity. Do You REALLY mean 100 Farad ? I've never seen one of these.
In cars, i have often seen a few Farads hooked up close to these huge amplifiers all those young guys use to destroy their hearing.
Best regards
Ebbe
Sorry Ebbe, typo, it's 100.000 microFarad in a small box - 2cm high and 2,7 cm dia. It comes with a flat ESR (non-inductive by nature). It is a 10V version that can withstand 13,5 volt without a problem.
divers 02'11 2358Kerst 2010 1.jpgI found my components in the local surplus market.

There is a 1 Farad version too of 10V, that Hiraga used himself in his design.
[There exist 100 F types for 3,3 volt on the market by the way too for power-supply backup purposes.].
albert
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Old 26th February 2011, 08:54 AM   #718
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interesting to use such a large capacitance and also batteries.... I still have never tried the battery version....

-Dan
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Old 2nd March 2011, 06:51 AM   #719
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Hello to all Monster lovers

What do you think about this KIT:
15W pure sound Class A amplifer kit Hiraga ! - eBay (item 220712678031 end time Mar-17-11 17:39:53 PDT)

it seems like all transistors are original and it worth attention?
will this amp match my acoustics: 3-Way Classic
(moderate listening levels, room below 20sq.m.)
Is it possible to get solid low end on Metallica or King Crimson for example ?
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Old 2nd March 2011, 07:52 AM   #720
WuYit is offline WuYit  Sweden
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Hi,
I`m very worried about the genuineness of those Toshiba devices...
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