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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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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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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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Dual Rail Power Supply for Power Amplifier

Posted 10th October 2012 at 05:55 PM by Tea-Bag
Updated 7th March 2016 at 12:08 AM by Tea-Bag (updating recommended BOM materials)

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 2mm 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.

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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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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fs2

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

fs2
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fs3

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

fs3
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fs4

Posted 8th October 2012 at 06:07 PM by N Brock

fs4
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Tube amp progress

Posted 21st September 2012 at 03:19 AM by wlowes

In the past few weeks I have made progress on by OTL amps. The wooden bases are finished, and I am very happy with the finish.

I reformed and tested all the big can caps. The Nippon Chemi Caps are fine. The big old Samgmo caps make me too nervous to consider using them. They may be serviceable, but have a high leakage current compared to the Nippons and do not seem to hold a charge. Perhaps I'll use them in some other project. I will buy 2 x 2200 caps for each rail. 4 per mono and 8 in total. This caused yet another redesign of the top plate. I have now got room to place a big heat sink on top. It will disipate heat from bridge rectifiers and big resistors used for soft start.

Finally I started to build. While all point to point wired, the amps will be modular. I am using wood blocks as the base for each power supply circuit. I laid out the supply for the small tube anodes and wired them up. This way the caps are well supported and vibration damped....
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My 6c33c OTL project

Posted 21st September 2012 at 03:03 AM by wlowes

I am starting this blog to create a record of my first tube amp project. The project is to build a pair of 110W 6c33c OTL monoblocks based on Bruce Rosenblit's patent. I am starting the blog at the stage that I am well into the project. I started planning and collecting parts well over a year ago and am at the stage where execution is under way.

So how did I end up with this choice? My DIY audio experience got under way with a Peter Daniel chip amp which I enjoy to this day. Along the way I discovered the Lampizator site leading to the creation of a 1541A DAC with 6np2 tube output. When this sprang to life I was hooked on the idea of building a tube amp. I have never actually heard a tube amp. The look is very fundamental. I want to experience the additional nuances in the music reported by tube amp fans.

I wanted to start with something simple but good quality for my first project. I also wanted to keep costs in check. I figured that good quality...
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