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Old 5th April 2011, 08:12 AM   #781
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Originally Posted by vizion View Post
What is the power consumption of 8w Hiraga amps ? 8w x 2 channels = 16w , 25% of 64w = 16w. So I'm guessing just 64w power draw for Class A.

Pretty cool running.
At 850 mA idle current from two rails of 13 volt (after CRC filter) it is 45 watts. That is cool for an almost "pure" class A.
My shunts absorb some 10-15 watts, and the power resistors in the CRC another 10 watts. The max power is then slightly below 8 watt indeed.

At 14,1 volt/1.100 mA it does get 62 watts. I have had that setting for years. It does then need a large heatsink then with a low thermal resistance to keep the classic output transistors below 45 degrees. This does give 8 watt.

SPU --> tube MM/RIAA; Kaneda pre; 300B SE driven by ECC35; Open Baffle PM2A, 2A9
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Old 5th April 2011, 08:54 AM   #782
lineup is offline lineup  Sweden
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Originally Posted by WuYit View Post
If only you knew just how devastating they are for the "AC curve", you probably would not say so.
In his 20w Hiraga amp, a later version, he has added such caps.
But that is a slightly different amplifier, with more gain, I think.
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Old 5th April 2011, 09:05 AM   #783
WuYit is offline WuYit  Sweden
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Yes, the caps were added for stability. Your modification lowers the open-loop gain and enhances linearity in every stage. Well done.
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Old 5th April 2011, 08:31 PM   #784
vizion is offline vizion  United States
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How does the sound compare to a mini aleph J (10 watts) ? There might be a little difference in sound. Hiraga's Monstre is push-pull and the J is single-ended among other things.
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Old 21st April 2011, 08:59 AM   #785
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Does the input must be modified in case of using XLR cables?
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Old 21st April 2011, 08:33 PM   #786
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hey, must the schematics of hiraga 20w version be somehow reworked in order to work off a car head unit (pioneer p88rs)
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Old 13th May 2011, 10:26 AM   #787
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I collected some of the transistors but i stopped the project due to several reasons.
So i have my transistors for sale for a reasonable bid ( i think $250 is reasonable for all, shipping included)

10 2SD844
10 2SB754
22 2SK170BL
20 2SJ74BL
10 2SD756
10 2SB716

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Old 13th May 2011, 10:37 AM   #788
neazoi is offline neazoi  Greece
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Do not forget about these power resistors too
A closely matched Quad
heated and then matched, easy paypal buy.

I have LOTS of them
Great DIY site: http://www.neazoi.com
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Old 13th May 2011, 11:11 AM   #789
WuYit is offline WuYit  Sweden
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can you give a discount on the fake 2SB754s?
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Old 13th May 2011, 11:20 AM   #790
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GL lot give very too high current from jFet... then to high noise in 2sc1775 and 2SA872... that is amplified by 2SB716 then 2SD844

Look at the "constant noise figure" of them ! We must not exceed about 1 mA in idle what that was expected by the designer

You have to gain at GR lot with an Idss at about 3mA no more
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