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Old 17th January 2003, 12:34 PM   #11
dhaen is offline dhaen  Europe
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Quote:
SV572-30 driving 2A3 SE works well.
He he
And I thought I was going into overkill on the driver.

Almarcy

How's the hum?
What's the ratio of the IS transformer?

Cheers,
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Old 17th January 2003, 06:51 PM   #12
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John,

Just checked out your website! Well done! Makes for good reading!

Will link to it soon!

Have a good weekend.

Cheers,
Bas
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Old 17th January 2003, 07:49 PM   #13
dhaen is offline dhaen  Europe
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Thanx Bas,

It's still rather "unrefined". I'll add and refine in time, and hopefully it'll mature.

Have a good weekend too; I'm working.

Cheers,
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Old 17th January 2003, 10:04 PM   #14
almarcy is offline almarcy  United States
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Wink hum

I got no stinking hum.

IT is 1:1

Happy Ears!
Al
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Old 17th January 2003, 11:17 PM   #15
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Default NO HUM.

Hi,

Al,

Do you care to clarify on how you heat the room?
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Old 18th January 2003, 01:27 AM   #16
almarcy is offline almarcy  United States
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Cool heat

I live in Phoenix, Arizona. The few kilowatts from the stereo are masked by the megawatts from the Sun

Driving PDQ1500, pair of 80 Hz ehorns with Lambda TD15 and Mission M72.

Nice tunes

Happy Ears!
Al
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Old 18th January 2003, 01:35 AM   #17
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Default CACTUS?

Hi,

Quote:
I live in Phoenix, Arizona.
That explains it.
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Old 4th February 2003, 12:26 AM   #18
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Default Evolution of the Power Supply

First, I would like to thank all those who posted to this thread.

My thoughts are now turning to the power supply. I am considering using two seperate power supplies: one for the 2A3 and its driver tube, and a separate power supply for the 572-3. The intent is to minimize ps-sourced distortion, and maximize weight

Rectification will be tube based.

So far, I have not been able to source a suitable transformer for the 2A3. The only one with 2.5 v secondaries is the Hammond,which is not available with 220V primaries. Ideally, the amp will have dual primaries, allowing world wide operation.

Smoothing will be with pi filters, c-l-c, perhaps dual pi. I am thinking of completely eliminating electrolytic capacitors, and using several(relatively) ac motor start polypropelyne caps. I have a small box of 50 uf 250V caps, which look like they might work.

As soon as I put together a schematic, I will post it, but as always, comments are appreciated.

Gilid
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