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Old 23rd July 2014, 05:43 AM   #3591
egra is offline egra  Hungary
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Originally Posted by borys View Post
The new amp is on the way. I think I will never finish any of them in 100%, there allways will be some ''new amp'', never ending story.
Congratulations Borys! BG(X) with DC input and cascoded VAS. What's your listening impression?
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Old 23rd July 2014, 07:38 AM   #3592
borys is offline borys  Poland
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thanks egra
The amp will be completed this week so maybe at the weekend I will have some time to verify if it was worth of doing it. Amp names BG9
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Old 26th July 2014, 12:47 PM   #3593
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Hello, everyone, for the first time sent a message, this is my DIY amplifier of 0dB
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Last edited by hansenni; 26th July 2014 at 12:51 PM.
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Old 27th July 2014, 12:15 PM   #3594
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Originally Posted by hansenni View Post
Hello, everyone, for the first time sent a message, this is my DIY amplifier of 0dB

Click the image to open in full size.
Excellent work, congratulation.
According to which schematic is this?
Thimios.
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Old 27th July 2014, 01:13 PM   #3595
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Default Hiraga rebuild

Rebuild of my Hiraga 30 Watt Class A amp.
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Old 27th July 2014, 01:19 PM   #3596
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Default Inside

I soldered everything. No connectors left inside. This was a tip someone gave me so I did a complete rebuild.
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Old 27th July 2014, 01:25 PM   #3597
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Now waiting for original NEC 2SA634 transistors to arrive..... I hope they arrive quickly!

When this one is finished, I will also modify my B1 preamp the same way. No connectors of any kind, only soldered connections. Should be a big difference!
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Old 27th July 2014, 05:59 PM   #3598
fotios is offline fotios  Greece
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Quote:
Originally Posted by thimios View Post
Excellent work, congratulation.
According to which schematic is this?
Thimios.
Apparently is a true symmetrical design. There are four amplifiers total, bridged per two, to form the LEFT and RIGHT channel. And of course only balanced (XLR) inputs are offered of which the hot(+) is connected to the input of one amplifier and the cold(-) to the input of other. The speaker is connected across to the outputs of the 2 amplifiers, the pos. terminal at the output of "hot(+) amplifier" and the neg. terminal at the output of "cold(-) amplifier". There are some significant benefits offered by this topology.
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Old 27th July 2014, 06:56 PM   #3599
fotios is offline fotios  Greece
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Quote:
Originally Posted by hansenni View Post
Hello, everyone, for the first time sent a message, this is my DIY amplifier of 0dB
Nice implementation hansenni . Let me guess:
+/-40Vdc supply per amplifier, so in bridge mode 160Vpp max output voltage swing.

That means a max power per channel:
80Vp / 1.4142 = 56.5Vrms
56.5 X 56.5 / 8 = 400Wrms @ 8 Ohms / 1KHz
56.5 X 56.5 / 4 = 798Wrms @ 4 Ohms / 1KHz

I suppose your toroids are rated at 800VA each one (or say at 600VA if you include a good VI limiter per channel).

BTW what means "of 0dB"?
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Last edited by fotios; 27th July 2014 at 07:00 PM.
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Old 27th July 2014, 11:40 PM   #3600
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Originally Posted by fotios View Post
BTW what means "of 0dB"?
It means this is fully differential (bridge) impedance buffer stage, having 0 dB voltage gain. It accepts balanced signal from any low Z high voltage preamplifier.
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