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50w Single-Ended BAF2015 Schade Enabled
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Old 12th October 2018, 11:00 PM   #621
Zen Mod is offline Zen Mod  Serbia
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50w Single-Ended BAF2015 Schade Enabled
Papa sez it's good.

'nuff.
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Old 13th October 2018, 02:45 PM   #622
Soundhappy is offline Soundhappy  France
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Originally Posted by kacernator View Post
Is it worth building this class A space heater?
Monoblocks do warmth your soul with the music and heat up room in autumn and winter season's.
Interesting Single-Ended amplifier Transistors in stock

IXFN140N20P IXYS | Mouser Europe
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Old 22nd October 2018, 09:33 PM   #623
dmy is offline dmy  United States
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Rebuilt the amp with bigger heatsinks. The monoblocks have been running stable and with fans running at low speed, heatsink is moderately warm to the touch. I am currently driving it with a 6922 tube preamp. I've listened to it for the last few days, I am very happy with the results. Money and time well spent.
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Old 22nd October 2018, 09:39 PM   #624
kacernator is offline kacernator  Czech Republic
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Originally Posted by dmy View Post
Rebuilt the amp with bigger heatsinks. The monoblocks have been running stable and with fans running at low speed, heatsink is moderately warm to the touch. I am currently driving it with a 6922 tube preamp. I've listened to it for the last few days, I am very happy with the results. Money and time well spent.
Have you compared it to another amplifiers? Does it handle complex music passages well, like metal music or symphony? No smearing of deatail?
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Old 22nd October 2018, 10:23 PM   #625
dmy is offline dmy  United States
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Originally Posted by kacernator View Post
Have you compared it to another amplifiers? Does it handle complex music passages well, like metal music or symphony? No smearing of deatail?
It is hard to compare this amp to other amps because this amp needs a gutsy pre to drive. None of my other preamps is capable to drive it. I breadboarded the 6922 pre mainly for driving this amp and it is not my favorite pre for other power amps. So my impression was mainly for the amp and 6922 pre combination.

I have yet to throw some symphony music at it, but from what I hear so far, the tonal balance top to bottom is really good, there is ample of detail and the mid is nice I can listen to it for hours without feeling fatigue.
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Old 24th October 2018, 01:48 AM   #626
aspringv is offline aspringv  Australia
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Originally Posted by dmy View Post
Rebuilt the amp with bigger heatsinks. The monoblocks have been running stable and with fans running at low speed, heatsink is moderately warm to the touch. I am currently driving it with a 6922 tube preamp. I've listened to it for the last few days, I am very happy with the results. Money and time well spent.


Yep, those are definitely 'bigger heatsinks'!
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Old 24th October 2018, 03:46 PM   #627
vdi_nenna is offline vdi_nenna  United States
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Hey, quick questions for the mathematically inclined of you out there and also those of you who understand class A efficiency schemes.

As designed, this is a SE 50w class A amp. Does this CCS source provide more efficiency, like the Aleph CCS? How do you get to 50w from 60v and 3.2A?
E*I=P or 60v x 3.2A is 192w. At 25% we get 48w. 25% seems high. That seems too easy and I'm probably wrong.

What I'm trying to figure out is- If I made one with half as much voltage and current, would it be a 25w SE amp? Something tells me it wouldn't, but don't know how to calculate the total power and then the efficiency of this type class A.
With 30v * 3.2A=96w * .25= 24w.

Am I close?

Thanks,

Vince
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Old 24th October 2018, 04:08 PM   #628
vdi_nenna is offline vdi_nenna  United States
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25% is normal class A efficiency. (Choke loaded more efficient) Thought it was less than 20%.

What are amplifier classes and their power efficiencies?

Did I answer my own question?
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Old 25th October 2018, 01:30 AM   #629
RobLK is offline RobLK  United States
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Wouldn't you need at least a 40 volts dc supply to get 25 watts?
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Old 25th October 2018, 01:57 AM   #630
vdi_nenna is offline vdi_nenna  United States
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How did you arrive at that answer?
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