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Old 31st March 2011, 11:01 PM   #1751
Nrik is offline Nrik  Denmark
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Cello Audio Palette clone

Cello Audio Palette

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Old 1st April 2011, 03:33 PM   #1752
wmincy is offline wmincy  Malaysia
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Hi DIYers,
This is a wonderful thread, I see people devoting themselves in doing something inspiring and beautiful that give them, and not only them, a lot of satisfaction!!
You guys are fantastic and your amps designed and built up are truly of state-of-art level!!
I would also like to contribute my little effort to this thread, hopefully many others DIYers will join in sharing their masterpieces and experiences.

Here attached is one of my latest built amp. It's built based on wimdehaan pencil tube hybrid amp. One of the photos shows the direct heated 5676 triode pencil tube. Since I could not get BUZ in my area I simply substituted them with IRF540/IRF9540 with a slightly modification on the original schematic. As the Vgs is higher with IRF hexfets, i increased the bias network resistor to give a +/-4V around the gates.
The size of this amp is roughly an A4 size, which fit perfectly in my small listening room. Don't bother with the protective film, i've already peeled it off.
Here you can notice the CD-rom player which is coupled with this amp.

Right now I'm working on a SE mosfet amp, the highly recommended power follower circuit (thanks Andrea) placed after a tube mu-stage, to give enough gain. Hope to finish it within a couple of months.
Attached Images
File Type: jpg DSCN5052_.jpg (159.3 KB, 1835 views)
File Type: jpg DSCN5047_.jpg (147.9 KB, 1773 views)
File Type: jpg DSCN5049_.jpg (173.3 KB, 1739 views)
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Old 1st April 2011, 04:07 PM   #1753
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Quote:
Originally Posted by wmincy View Post
... Here you can notice the CD-rom player which is coupled with this amp. ...
Building with wood! Too cool. I've tried some clear plastic and wood combinations with quite satisfactory results ... Stay the course
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Old 2nd April 2011, 08:38 AM   #1754
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very nice work sir......

nice to see ......

thank u sir...
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Old 3rd April 2011, 03:24 PM   #1755
osscar is offline osscar  Latvia
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I finished my Le pacific style RIAA simple preamp. The original version was p2p with 2sj74 transistors. Final version with 2sk170. enclosure from ebay, cheap and good (including 4xRCA; rubber feet, mains socket / fuse holder)
Design similar to my F5. It have DIN socket, because my LP player have a DIN plug, I do not want to rebuilt it to RCA. Parts: RIFA caps and matched FETs + 1% MF resistors.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 13th April 2011, 08:40 AM   #1756
shaan is offline shaan  India
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Default Lateral FET amp for midrange and highs... I call it Magic.

Veroboard-art. hehe...

Test sample. But, but this test sample will be put to my final system. Not gonna discard, precious. Have designed a single layer PCB too... Hope to have it etched SOON.
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File Type: jpg DSC05492.JPG (379.1 KB, 272 views)
File Type: jpg DSC05535.JPG (316.8 KB, 293 views)
File Type: jpg DSC05536.JPG (335.4 KB, 250 views)
File Type: jpg DSC05537.JPG (377.1 KB, 270 views)
File Type: jpg DSC05541.JPG (327.6 KB, 285 views)
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Old 13th April 2011, 09:59 AM   #1757
AndrewT is offline AndrewT  Scotland
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Thanks for that pin fixing solution.
Jpin and then bend over the short end.
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Old 13th April 2011, 04:42 PM   #1758
wmincy is offline wmincy  Malaysia
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great job Shaan! beautiful layout!

What amp is that precisely? Just wonder why don't you drive the mid and high with your prompt MPF amp? It should sound more delicious IMHO, or maybe you prefer to try different taste
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Old 13th April 2011, 09:21 PM   #1759
shaan is offline shaan  India
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Quote:
Originally Posted by AndrewT View Post
Thanks for that pin fixing solution.
Jpin and then bend over the short end.
One important step in between.

Jpin -> Solder to board -> bend over the short end.

If step 3 is performed before step 2 then the pins tend to deform and/or displace. This is what I observed.

And an eye candy for you below.
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Old 13th April 2011, 09:43 PM   #1760
shaan is offline shaan  India
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Default Summertime MPF

Quote:
Originally Posted by wmincy View Post
great job Shaan! beautiful layout!

What amp is that precisely? Just wonder why don't you drive the mid and high with your prompt MPF amp? It should sound more delicious IMHO, or maybe you prefer to try different taste
Thanks for your kind words.

The amp is a mix of Self-Blameless and ESP-P101. Plus some of my humble contributions like the optional 2.2ohm Zout, lower overall gain and increased LTP current.

I LOVE the MPF. Irreplaceable. Yes it sounds SWEET. SE thing you know. I listen to MPF from October to February. Coz 200watts of heat helps a lot in winter as well as the warm sound it presents. Absolutely no need for a blanket at a night of 5degrees.

I want it in the summer too. But the heat hurts. Has been searching for something that can deliver me that same sound without so much heat... I have found something close, this amp. But not exact same, and absolutely not with the default Zout which I think is less than 0.0000001ohm or so(not really)... LOL It produces really solid bass. Distortion-wise it wins over MPF and doesn't disturb when playing loud. But I will forgive MPF, blessed with innocence.

This amplifier will draw 250+250mA and with the high output impedance it almost mocks the MPF. Almost... This is my Summers MPF. YES it too is a POWER MOSFET amp and also runs in source follower mode, like the MPF.

Seems like I am enjoying old taste in new foods!

Last edited by shaan; 13th April 2011 at 09:54 PM.
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