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Elekit TU-879S

Posted 12th August 2010 at 07:24 PM by alexcp (My DIY projects)
Updated 11th April 2016 at 07:59 PM by alexcp

Elekit TU-879S is the best sounding kit I have ever built. Thank you TubeDepot.com for selling these kits. With my DIY full range speakers I mentioned a couple of posts earlier, the sound is fantastic.

Update: one of the original 6L6 tubes got blue sparks inside. As this amp can use KT88, KT66, or EL34 without any adjustment or modification, I replaced both 6L6s with EL34s left from the K4040 project, but the sound deteriorated. A replacement 6L6 from TubeDepot.com restored everything.
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Posted in Tube power amps
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Old

First Watt B1 clone

Posted 12th August 2010 at 07:19 PM by alexcp (My DIY projects)
Updated 11th April 2016 at 07:53 PM by alexcp (Added photos)

What to say... B1 is a great design by Nelson Pass. Easy to build, absolutely transparent to the sound, compact, PCBs are available. I built one, using Nelson Pass' gerbers for making my own PCB, in an enclosure from diyenclosures.com (which sadly seems to be defunct now). The big blue film caps are 10uF Evox Rifa PHE426.

Update: I added a relay input selector, which reduced crosstalk between inputs. I also built another B1 clone (the last three photos), in an enclosure 1U (40mm) high.
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File Type: pdf B1 Buffer Preamp.pdf (273.8 KB, 66 views)
File Type: zip B1 R0 DIY GERBERS.ZIP (423.6 KB, 30 views)
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Posted in Preamps
Views 5042 Comments 2 alexcp is offline
Old

Zen V4

Posted 12th August 2010 at 05:16 PM by alexcp (My DIY projects)
Updated 11th April 2016 at 07:49 PM by alexcp (Amp reworked)

Nelson Pass' Penultimate Zen (aka Zen V4) proved trickier to build than the simple schematic suggested. I used a chassis from designbuildlisten and PCBs made with the gerbers posted on passdiy.com. Initially I used some Chinese electrolytic capacitors that were easily available, but the sound was not good at all. I replaced them with ELNA for Audio, and things improved greatly. I found that the apparent simplicity of the schematic belies the difficulty of making it right.
Update: I replaced the gain stage MOSFET with a SemiSouth SiC JFET and got a noticeable improvent in both the sound and the measured performance, see a separate post.
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Old

Fostex BK-20

Posted 12th August 2010 at 05:06 PM by alexcp (My DIY projects)
Updated 15th August 2010 at 04:18 PM by alexcp

Having built a few amplifiers, I wanted to build a pair of speakers and settled on Fostex BK-20 kits from Madisound with Fostex FE-206E 8" full range drivers. I've always considered carpentry not my cup of tea, so gluing, sanding, and painting the speakers took longer than expected. However, I am very satisfied with the sound.
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Posted in Speakers
Views 3816 Comments 4 alexcp is offline
Old

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
Views 2386 Comments 0 alexcp is offline
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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Posted in Uncategorized
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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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Posted in Uncategorized
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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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Posted in Uncategorized
Views 1016 Comments 1 stripe157 is offline
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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Views 1109 Comments 1 DougL is offline
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