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Old 14th July 2009, 03:54 PM   #1
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Arrow Melody 400W Power Amplifier

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Hi everyone,

Does anyone have built this amp so far?
It looks good to me. I want to either build this or LYNX-3.
Which one do you suggest?

Would someone please clarify me why powerAms having an opamp in their first stage aren't so popular?(like PA-300 from Elektor)


Regards!
Ermac
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Old 15th July 2009, 07:42 AM   #2
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Here's the schematic:
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File Type: jpg 400w.jpg (77.3 KB, 2086 views)
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Old 15th July 2009, 08:55 AM   #3
AndrewT is offline AndrewT  Scotland
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it looks to me that someone has redrawn this with a 4pair output stage. They have increased the supply voltage without regard to what voltage suits the transistors specified.
It uses driver devices for the pr-driver and Vbe multiplier.
And uses driver devices for the VAS.
These devices should be low Cob, high gain (at low current), High fT at low current, high Vce0
Most of the voltage amp stage uses 546/556 these are 65V devices.
Do you really expect all of them to survive 140V? (i.e. Vc + |Ve| = 70+70 = 140)
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Old 15th July 2009, 09:53 AM   #4
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It can be used with 50-0-50V supply.
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Old 15th July 2009, 10:17 AM   #5
AndrewT is offline AndrewT  Scotland
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using +-50Vdc it becomes a 200W amplifier with the wrong devices specified.
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Old 15th July 2009, 10:36 AM   #6
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I think using four pair output devices is for lowering the load down to 2 ohms.
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Old 15th July 2009, 11:12 AM   #7
AndrewT is offline AndrewT  Scotland
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yes. 4pair of mJ14003/4 kept cool can drive a 2ohm speaker load from +-50Vdc.
If sufficient smoothing is fitted and a high dissipation heatsink is used, you may get 400W into 2ohms
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Old 15th July 2009, 11:41 AM   #8
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Quote:
Originally posted by AndrewT
yes. 4pair of mJ14003/4 kept cool can drive a 2ohm speaker load from +-50Vdc.
If sufficient smoothing is fitted and a high dissipation heatsink is used, you may get 400W into 2ohms
Exactly, I want to do so! But I hesitate whether build LYNX3.0 or Melody. LYNX with opamp in its fisrt stage and Melody with transistors... Which one do you suggest?
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Old 15th July 2009, 11:53 AM   #9
AndrewT is offline AndrewT  Scotland
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I don't know either amplifier, but the Melody with inappropriate transistors specified at various locations can hardly be recommended.
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Old 15th July 2009, 11:56 AM   #10
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Ok, thank you for your input and ideas.
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