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Old 21st May 2002, 11:54 PM   #21
jazz is offline jazz  Netherlands
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Default maybe offtopic by now but...

Just a thought but those transformers macbeth has seem just about perfect for building one or two hiraga monster amps. could be a nice experiment, it's a nice little amp.

greetings,
J. Zoutendijk
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Old 22nd May 2002, 02:00 AM   #22
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Kilowatt,

If you account for power factor and amplifier efficiency, the total power draw could easily peak at between 15 and 20kW ...

Also 5 devices per channel in parallel even with water cooling is seriously pushing the limits if you will be operating near full power for more than the briefest of moments.

NU_NRG,

You will lose a reasonable amount of energy in heat but you should still get enough power to be useful for something.
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Old 22nd May 2002, 02:09 AM   #23
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Yeah, there's five devices in parallel, but that's not all. There are also 2 in series, and therefore 20 devices per channel when the opposite polarity ones are added. This is the same number and the same type of devices that Anthony Holton uses for his 1KW amp, rated 1050W, and I will only be pushing 900W, so they'll hold up fine.
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Old 22nd May 2002, 02:12 AM   #24
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Dont count on it!
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Old 22nd May 2002, 02:17 AM   #25
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Think I ought to bump it up to 22 or 24 devices/channel? Even though, Anthony made 1KW with 20 and it worked fine.

Matt, do these transformers have a center tap? Or are you going single ended? A good floating ground would draw as much again as the amp.
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Old 22nd May 2002, 02:22 AM   #26
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Yes Kilowatt given that you are using water cooling you could use 6 devices in parallel giving a total of 24 devices per channel this would make me feel a little more secure.
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Old 22nd May 2002, 01:08 PM   #27
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Default transformers

The transformers are center tapped. While the power supply is on (in the power supply unit the transformer is taken from, not the audio power supply that I'm working on) they measure 17 Vrms (each, and there are 2 taps) with a fluke 76 meter.
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Old 22nd May 2002, 01:52 PM   #28
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AudioFreak,

thnx for the feedback, but is there any way of keeping the xformer from dissipating that much? soldering the 2 cores together?


Kilowatt,

what slew rate do you intend your amp to have?


Anyone,

what is the lowest slew rate should I consider for a sub amp? 3v/ms enuff?


Thnx for the feedback
-Simon
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Old 22nd May 2002, 03:44 PM   #29
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I'd like to have about 8V/ms, but it will be hard to ahieve. For an amp that must swing over 300W, I wouldn't recommend any less than that (based on Randy Slone's book). Now, for a sub amp, maybe you could get away with 3V/ms, but perhaps someone smarter than me could add more info.
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Old 22nd May 2002, 04:24 PM   #30
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Excuse me, that's us, not ms.
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