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Velleman K4040

Posted 12th August 2010 at 04:53 PM by alexcp (My DIY projects)
Updated 11th April 2016 at 07:45 PM by alexcp

Then was the K4040 from Velleman. Contrary to some reviews, I found this amp sounding rather nice, particularly after I replaced the EL34 tubes in the output stage with separately purchased matched quads. However, the sound does not quite match the price, and I keep this amp mostly for its looks.

Update: I modified this amplifier, leaving little of the original design. See a later post with the details.
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Posted in Tube power amps
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Old

S5 Electronics "L" series tube amps

Posted 12th August 2010 at 04:52 PM by alexcp (My DIY projects)
Updated 5th May 2015 at 12:38 PM by alexcp

I started with a Model 8LS stereo amp from S5 electronics. Later I put it into a Hammond enclosure and replaced the tranformers with Edcors.

Separately, I built a Model 16LS, which is the same thing with a doubled output stage, giving a very similar sound. Both use a 5670 double triode in the voltage amplifier and phase splitter, and 2x6005 (4x for the 16LS) in the PP output stage.

Both versions are very easy to build, nice with vocals, but not quite HiFi - see the FFT charts. Matching tubes and the resistors in the split-load phase splitter circuit helps to reduce distortion.
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Posted in Tube power amps
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Old

Sony VFET version 2 AL Boards Build Blog

Posted 8th August 2010 at 09:29 PM by Tea-Bag
Updated 25th January 2016 at 03:35 PM by Tea-Bag

In the rare case you happen upon matched pairs of these transistors, and you like drilling, and you think my boards may be Ok, then go ahead and read this blog.

As a starting point, we settled on this schematic for the working amplifier. Some modifications were done from the original, and Botte made some changes to get a slower turn on rate for the boards.

Click the image to open in full size.

Note, R37,R38 and C1 and C2 have been changed. However, feel free to use original values.
Also note, for greater viability of use of JFETs beyond 8ma IDSS, source resistors can be used here ( I used 10R with 9ma pairs) - Otherwise jumper this location.


Q13 and Q14 are BC550c and BC560c. Originally Toshiba bipolars were used on my boards, but they were not stable in voltage and gain suffered on the boards. The boards have since had the pads altered to remove...
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Old

Mis-understood ArT - Part II

Posted 6th August 2010 at 10:15 PM by tomtt
Updated 19th January 2011 at 11:42 PM by tomtt

i actually spoke to Taylor Swifts agent.

he cleared up a few unanswered questions,

i had about the 'Kanye/Taylor incident.'

http://img836.imageshack.us/img836/7...itowebcam5.jpg

Click the image to open in full size.

http://gifsoup.com/MTMyODAxNw


http://www.radioworld.com/article/105742

http://www.fundinguniverse.com/company-histories/Ballantyne-of-Omaha-Inc-Company-History.html
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Old

Up and running

Posted 4th August 2010 at 09:08 PM by stripe157

As of August 4, at 4:01, this is an official, working amplifier!

Once I decide on a volume control knob, I'll make a wooden face plate for it and call it finished... for now.
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Old

PassDIY LDR

Posted 30th July 2010 at 10:10 PM by DougL
Updated 14th September 2010 at 06:33 PM by DougL

http://www.diyaudio.com/forums/analo...ml#post2258073

This looks cool.
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Old

Binding posts/RCA

Posted 27th July 2010 at 04:11 AM by stripe157

Click the image to open in full size.
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How low can you go?

Posted 26th July 2010 at 06:46 AM by abraxalito
Updated 31st August 2010 at 04:28 AM by abraxalito

The prices of DVD players just keep on going down here. Yesterday I bought my very first 99RMB [that's under $15] model in Carrefour. I couldn't wait to get home to see how it sounded.

First up I listened to one of my favourite BIS recordings - Mozart 40 in a version for piano, flute and strings. The sound really wasn't as bad as I'd expected - the cello sounded really 'reedy' rather than full-bodied and the flute was akin to a sopranino recorder in its higher register with very little bloom. But there was a fair approximation to a soundstage and really quite decent dynamics, not at all 'bitstream'.

Rebecca Pidgeon's 'Spanish Harlem' is the test disc I use to check for sibilance (it has lots of 's' sounds), and sure enough there was some but definitely not terrible considering the price.

This undoubtedly had potential for the price - I wondered if it could be improved. Inside almost all the functions are integrated on the MediaTek chip (although it...
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Old

Chassis by Dell... with tubes

Posted 20th July 2010 at 06:15 PM by stripe157

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Old

Chassis by Dell

Posted 20th July 2010 at 05:00 PM by stripe157
Updated 27th July 2010 at 07:48 AM by stripe157

Under construction:
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Front:
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With some black satin sprayed on:
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With TubeLab.com's Simple SE board:
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