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Tuesday, February 08, 2005. My T12 is into 10 hours of burnin and the sound is much better. The high and low extension is very more extreme, the base are tight with good control and the sound stage is very realistic and pin point accurate. It is also a very fast amp, listerning to large orchestreal piece does not show any trace of looseness. Overall, I am extremely happy with its performance! Posted by ackcheng @ 7:05 PM. Saturday, February 05, 2005. Initial impression of the sound is very very good!

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ackcheng | ackcheng.blogspot.com Reviews
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Tuesday, February 08, 2005. My T12 is into 10 hours of burnin and the sound is much better. The high and low extension is very more extreme, the base are tight with good control and the sound stage is very realistic and pin point accurate. It is also a very fast amp, listerning to large orchestreal piece does not show any trace of looseness. Overall, I am extremely happy with its performance! Posted by ackcheng @ 7:05 PM. Saturday, February 05, 2005. Initial impression of the sound is very very good!
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1 ackcheng
2 the sound
3 5 comments
4 testing
5 1 comments
6 circuit modification
7 0 comments
8 the case
9 mechanical damping
10 the circuitry
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ackcheng,the sound,5 comments,testing,1 comments,circuit modification,0 comments,the case,mechanical damping,the circuitry,ripples reduction,spp capacitors,power supply unit,transformers,preparation,about me,name,previous posts,archives
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ackcheng | ackcheng.blogspot.com Reviews

https://ackcheng.blogspot.com

Tuesday, February 08, 2005. My T12 is into 10 hours of burnin and the sound is much better. The high and low extension is very more extreme, the base are tight with good control and the sound stage is very realistic and pin point accurate. It is also a very fast amp, listerning to large orchestreal piece does not show any trace of looseness. Overall, I am extremely happy with its performance! Posted by ackcheng @ 7:05 PM. Saturday, February 05, 2005. Initial impression of the sound is very very good!

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ackcheng.blogspot.com ackcheng.blogspot.com
1

ackcheng: Power supply unit 2

http://ackcheng.blogspot.com/2005/01/power-supply-unit-2.html

Sunday, January 16, 2005. Power supply unit 2. So there goes the power supply unit. When I built my GG, i had a lot of problems with noise. So in the design of my T12, I pay particular attention to the isolation, the case deisgn is devided into 4 layers, the bottom layer is where the transformers are placed. this mainly contains AC. Right above it is a layer of bridge, regulators and all conversion to DC is done on this layer. Then comes the capacitor layer where all the ripples are removed.

2

ackcheng: Power supply unit

http://ackcheng.blogspot.com/2005/01/power-supply-unit.html

Sunday, January 16, 2005. There are a few power supply units required for T8:. The transformer that provide the 550V, it is specified to be a 200V, 100ma transformer, however you would expect a significant voltage drop and I chose a 430V, 40VA transformer and planning to use full bridge rather than voltage doubler. This spec gave me 520 at the end. The negative bias supply reuired a 120V, 10VA transformer. I combined the two and order a 50VA transformer from LITE. All these are placed on one single PCB.

3

ackcheng: Calculating the OTL power

http://ackcheng.blogspot.com/2005/01/calculating-otl-power.html

Sunday, January 16, 2005. Calculating the OTL power. Well well well, a bit of maths here! On the Transcendent forum, I asked a bit about the calculation of OTL power and I wonder what sort of power will my T12 OTL output? Well, each tube of EL519 can generate about 1A and there will be 6 in each bank giving about 6A in AB mode as the peak current. Solving the equation Ipeak = 6A = sqrt(2*power/speaker resistance). Assuming the speaker resistance is 8ohms,. Power of my T12 = 144W. Well, not bad!

4

ackcheng: Testing

http://ackcheng.blogspot.com/2005/02/testing.html

Saturday, February 05, 2005. Initial impression of the sound is very very good! I have heard this amp in my friend's home, but when I hear my own creation in myown house. This is really touching. The extension to both ends are very good at the start already The control of the base is very good and the amp is extremely fast. There are a lot more datails I can hear now that just wasn't audible before. The amp is running quite hot though, I measured the top cover of my amp and it is recorded 60deg!

5

ackcheng: The case

http://ackcheng.blogspot.com/2005/01/case.html

Sunday, January 16, 2005. Now, I still need to settle on the chassis. I actually have it tailor made in a local store according to my size, spec and the holes drilled. I then put them together with aluminium rods which I bought in material store. To allow the tubes to breath, there are many holes which will eventually covered with metal gauze. Posted by ackcheng @ 8:44 AM. View my complete profile. Power supply unit 2. Calculating the OTL power. A journey with T8.

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Digital room correction: November 2005

http://digitalroomcorrection.blogspot.com/2005_11_01_archive.html

Thursday, November 17, 2005. The very first step. I am ready to take my very first step. Just finished reading the DRC manual available here. It is a good read and I can imagine the amount of work Dennis has put into it! At thie juncture, I would like to thank Dennis and all who have contributed to this great program! As a start, I will follow this step by step guide. Well, all the softwares are ready. I just need to work out the connection! Posted by ackcheng at 7:41 AM. Wednesday, November 09, 2005.

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Tuesday, February 08, 2005. My T12 is into 10 hours of burnin and the sound is much better. The high and low extension is very more extreme, the base are tight with good control and the sound stage is very realistic and pin point accurate. It is also a very fast amp, listerning to large orchestreal piece does not show any trace of looseness. Overall, I am extremely happy with its performance! Posted by ackcheng @ 7:05 PM. Saturday, February 05, 2005. Initial impression of the sound is very very good!

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