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Current output...

Posted 15th November 2012 at 09:05 PM by hbc

I think I may be getting it..?? (well something anyway). I have been living happily with the 3w ECL86 amp (current output reigned in by feedback) for some months, and am accustomed to its sound now. A friend has recently returned my Class A hybrid digital amp and I thought I would try it out again. I instantly noticed a sort of grungy ness and colder “transistory” sound, even though this is a no feedback design with a transistor emitter follower output. It is curious how the little IB two way speakers don’t like transistor amps.

I got to thinking about current output amplifiers, I was intrigued a few months ago by some comments on an article in the EE times Consumer audio: Is accurate sound overrated? where the poster "Cookie Jar"  stated “One day on a whim, I hooked up my distortion meters to the actual speaker terminals of my living room stereo, and I was in for a rude awakening. The distortion readings were a couple of orders higher than for...
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hbc
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Old

My Nexus 7 Tablet

Posted 12th November 2012 at 06:54 AM by rjm
Updated 18th November 2012 at 04:03 AM by rjm

The Nexus 7 is cheap. I paid 19,800 yen for my 16 GB model, shipping and tax inc., and it came with 2,000 Yen credit to buy apps and movies and such in the online Google Play store. And yes, its plastic, even the silver metallic trim around the edge is just a silver-coated plastic part. It is solid, however; sturdy, well-built, and good-looking. The back is covered in grippy, dimpled rubber that feels like leather. The screen is a little dim, but high resolution (800x1280) ~220pi, pretty to look at and easy to read.

With a 7" screen and default portrait orientation the device is closer in spirit to a large smartphone than a small tablet. A giant, wi-fi only smartphone. It's a handy size for reading paperback-format books, comics, and news articles, but not so hot for magazine format publications and A4-formatted journal articles. Browsing the web is generally fine, but the experience varies widely depending on the individual layout of the web page. As you might expect,...
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Old

OTL update - tube power supplies Done!

Posted 4th November 2012 at 02:14 PM by wlowes

Over the past few weeks I continued to build out and test the power supplies. I really am pleased with the decision to make each supply as a module that can be fully developed and tested outside the box.

After the success with the first supply for small tubes, I moved on to the power tubes. After abandoning the large Sangamo can caps, I ordered in 8 2200uf snap in caps.. 2 per rail, 4 per monoblock. After they arrived I realized that these things are pretty big. The question was how to securely mount them. I settled on another wood block so they can be mounted securely under the chokes. As before, I mounted them through the wood using some silicon cement. There are some nice mills wire wound bleeder resistors. The B+ power supply design calls for a single center tapped 230v transformer. I had scored 2 pairs of 120v 500va Toroidal transformers. I must admit it took a lot of research and a couple of helpful posts before I was sure that I really had this figured...
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Old

Need Realistic HK 210/Acrosound Stereo 120 Amplifier Schematic

Posted 28th October 2012 at 08:13 PM by 1972youngstown

recently aquired Realistic HK-210/Acrosound Stereo 120 amplifier. would like to restore but can not locate schematic or operating/owner's manual(instructions for biasing tubes). does anyone have schematic and/or manual or direct me where i can be find them?
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Old

Sydney HiFi show - a mostly eye opening, not ear opening, exercise ...

Posted 22nd October 2012 at 09:58 PM by fas42
Updated 23rd October 2012 at 11:33 PM by fas42

Well, as mentioned elsewhere checked out the first proper show we've had in decades, and in hindsight it has been a very worthwhile, educational experience. Not because I heard magic audio I've never heard before, but, because I then browsed a collection of other people's thoughts and takes on the various sounds heard at the event, on another, Australian, audio forum.

Which showed me that people are in very different spaces, as regards to what is considered, "proper sound". Obvious of course, but it still throws one, makes one question one's ideas and thinking on matters ... for a split second, at least ...

My personal take on the show is that there has been a very discernable improvement in the standard, or average, quality of sound of a normally assembled system which has had only a minimal amount of tweaking applied to optimise it. Problems that were obvious in previous such efforts were far less apparent, you didn't want to run screaming from...
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Old

Eastern DIY Audio Gathering

Posted 16th October 2012 at 03:07 PM by vdi_nenna

This is a place holder for information regarding an East Coast DIY audio gathering.

Stay Tuned...
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Old

Dual Rail Power Supply for F5T and F6

Posted 10th October 2012 at 05:55 PM by Tea-Bag
Updated 27th October 2013 at 01:02 PM by Tea-Bag

Here are some pictures of the Power Supply that CRT and myself designed for use with the F5T and F6Convertible design. It is meant to be both compact, have adequate capacitance, and be able to use the recommended MUR3020W or similiar diodes. They are 2.5mm thick boards with 3OZ copper thickness.

(Updated boards take now 40mm wide caps and are larger measurements below and new pics)

Click the image to open in full size.

Boards measure 108mm wide x 192mm long. The diode boards are 35mm x 54mm each.

Click the image to open in full size.

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...
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Old

Amp Camp Amp Build Instructions

Posted 8th October 2012 at 06:10 PM by N Brock
Updated 26th October 2012 at 07:36 PM by N Brock (added link)

http://www.diyaudio.com/forums/diyau...ild-guide.html

Here is the link for the actual build guide.
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Old

fs2

Posted 8th October 2012 at 06:09 PM by N Brock

fs2
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Old

fs3

Posted 8th October 2012 at 06:09 PM by N Brock

fs3
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