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Old 4th August 2004, 11:07 PM   #1
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Default Amp Ideas for spare Donuts

My Luxman M-117 amp has packed up and may have to look for a amp replacment.

At my disposal, I have a pair of rather large Plitron donuts laying around. 2 x 0-40V secondaries.

Any ideas on a suitable amp I could make?

BQ
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Old 4th August 2004, 11:50 PM   #2
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What kVA are they?
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Old 4th August 2004, 11:54 PM   #3
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Oops.. I forgot the most important part!

They're 2KVA!!!!

BQ
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Old 5th August 2004, 12:01 AM   #4
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Big assed Aleph X. Now you need a big assed set of heatsinks
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Old 5th August 2004, 12:27 AM   #5
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That would be an extremely high output AX. You do a pair of Aleph 2's with double the output devices or a pair mono Aleph 1.2.
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Old 5th August 2004, 12:33 AM   #6
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Default more SoZ?

For some reason, i'm beginning to like the idea of building the SoZ again for the simple reason that a variac can be used. (Lack of any voltage regulators)

Since most of the time we listen to music in the 1st watt, I can have the variac set at a low voltage. Not enough power? Just turn that dial!

Comments?

Here at my disposal, I have some pretty big heatsinks I can use.

BQ
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Old 5th August 2004, 12:41 AM   #7
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Oops, I was thinking 40vct. Yes Aleph 2+. 100 watts @ 8ohm with current to spare.
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Old 5th August 2004, 03:07 AM   #8
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Default Re: more SoZ?

Quote:
Originally posted by Super_BQ
For some reason, i'm beginning to like the idea of building the SoZ again for the simple reason that a variac can be used. (Lack of any voltage regulators)

Since most of the time we listen to music in the 1st watt, I can have the variac set at a low voltage. Not enough power? Just turn that dial!

Dial-a-Watt. You can have that big variac knob sticking out of the front panel next to one of those big Frankenstein on-off knife switches.
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Old 10th August 2004, 03:37 AM   #9
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Use a large inductor as the entry point for your power supply filter. Something like an LC or LCLC. This will actually drop the rail voltage a bit if the coil is big enough. On the plus side, you will have a power supply that can deliver more current than an equivalent cap input filter.

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Old 10th August 2004, 08:28 AM   #10
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Quote:
Originally posted by GRollins
Use a large inductor as the entry point for your power supply filter. Something like an LC or LCLC. This will actually drop the rail voltage a bit if the coil is big enough. On the plus side, you will have a power supply that can deliver more current than an equivalent cap input filter.
Just be sure that the inductor have very low series resistance or it could nastily hot. Also note that if the front inductor fails for some reason the voltage will rise approximately 20%. Otherwise a very good solution.
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