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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th October 2005, 04:12 AM   #11
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Quote:
Originally posted by Andrewbee

Dsavitsk, I cannot compare the 41Hz product against anything as I have never heard it and your tube amps may indeed be way better than mine, I have never heard them either. You posted a picture of what appears to be a DHT amp, looks to be a SE design (unless its some twin tube I have never seen before :-).
They are welborne labs drd 300b's

Quote:
Originally posted by Andrewbee
BTW, does the 41HZ product have the turn on thump?
nope, though I always put it on mute when powering up or down so i don't really know.

Quote:
Originally posted by Andrewbee
Also, the filter board in the picture of the t-amp, is it two separate channels? I see what appears to be 8 diodes in the front and lots of caps so it looks to me to be separated but with a single toroid.
It is essentially carlosfm's snubberized design. It is a single toroid with dual secondaries. Each set is rectified and smoothed with 10 x 1000uF panasonic FM caps.

Quote:
Originally posted by Andrewbee
One more thing, the amp itself, I see what looks to be 4 large caps, 2 elco’s and 2 film types, are those the stock caps and do they come like that or is it some change you made to the board?
No, 41Hz supplies 2 x 330uF caos. I found that there was no bass to the amp. I replaced them at first with Nichicon Muse 470uF caps, but them upped them to 1500uF FC caps with 0.1uF film and foil bypasses. This brought out the bass in the amp, though my 300b's still go deeper and are fuller.

-d
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Old 20th October 2005, 08:52 AM   #12
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The high power tripath is quite different to the lower power chips. The ta2020 output in push-pull mode while the higher power chip is single-end.

I am still trying to get sound out of my AMP6.
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Old 20th October 2005, 05:25 PM   #13
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Hey Andrewbee

Since you have so many amps to compare to the Charlize amp, I was wondering if you could tell us your favorite amp out of all the amps you own so far. How does the SE-OLT compare to the Charlize amp? Are your favorite speakers full range drivers? I currently just own a modded Sonic Impact amp with Hammer Dynamic speakers which is a killer combination.
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Old 20th October 2005, 05:51 PM   #14
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Quote:
I was wondering if you could tell us your favorite amp out of all the amps you own so far
SE OTL



Quote:
How does the SE-OLT compare to the Charlize amp?
Too soon to tell, give me a while to find out.



Quote:
Are your favorite speakers full range drivers
Yes SE208 Sigma not the new EZ.

I am also a fan of the FE103 Fostex, not the RS 1197 wannabe

Andrew
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Old 20th October 2005, 07:40 PM   #15
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Click the image to open in full size. Charlize photos' should be here
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Old 20th October 2005, 08:25 PM   #16
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Pretty in Pink!
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Old 20th October 2005, 08:43 PM   #17
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Default hi Andrewbee

you said;

"am presently trying to work out the conversion of a PC power supply to power it as Nuuk feels the SMPS is even better than a battery."

What kind of SMPS are you thinking of getting.
I was running batteries and very happy.

Today I got a SMPS and was dissapointed - lack of dynamics and clarity - some sort of distortion that I can't put my finger on.

went back and forth and everytime the SMPS sounded lacking.

Maybe the SMPS has to be a specific kind?

thanks
Bachiano
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Old 20th October 2005, 09:32 PM   #18
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Hi Bachiano,

The SMPS is in the post before yours with the link, its an old Compaq computer power supply. Its been playing for the last 2-1/2 hours and I have not been really listening to it, just letting Charlize break in. I took a very quick listen and might have detected a very slight difference but would not swear to it and my impression was opposite to yours. I thought the dynamics may have been improved and the sound a little more forward but again this was just a quick listen. I thought it sounded fine with the battery though, with more listening I will have a better feeling on the differences if any. Right now I just want to build some time on it.

How close to your amp was your SMPS and was it enclosed? Perhaps it was picking up some noise?

Andrew
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Old 20th October 2005, 09:37 PM   #19
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[QUOTE]Pretty in Pink! [/QUOTE

Thats my female side showing! I actually like Pink!
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Old 20th October 2005, 09:51 PM   #20
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Default hi Andrewbee

I see it now - your PSU

No, mine it's not enclosed - it's naked and it was about two feet from Charlize.
I do hear a high frenquency switching noise coming from the supply. (12 - 15 volt@ 8 amps)
Is that normal ??? - I got it from a surplus place, so maybe it's not 100% healthy.

Bachiano
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