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Written by 站長Chris Chang

Parent Category: Audio frequency circuits-en-gb

Published: 31 May 2016

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Vacuum tubes have been invented for nearly 100 years. Honestly all possible circuits configurations are almost exhausted. About fifteen years ago, following the rise of internet, there used to be an electronics Periodical called theTube CAD Journal where many innovative circuits were published. Tube CAD Journal seems to cease publishing since 2003. Around the same time period another paper based Periodical, the Vacuum Tube Valley, stopped publishing after the chair editor Charlie Kittleson passed away. There were a total of 20 issues of Vacuum Tube Valley with good materials on vacuum tube circuits. Since then it was really quiet. That's why my eyes were wide-open when I see the Longitudinal Direct Couple Amplifier. In the rest of the article I use the acronym LDCA to represent the name of this circuit.

Longitudinal Direct Couple Amplifier, publish granted by Chris Strickland

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Written by 站長Chris Chang

Parent Category: Audio frequency circuits-en-gb

Published: 01 May 2016

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This pair of 50 SE amplifiers was built by me some 15 years ago. The circuit is very stable and during the years of service there wasn't much problem except one event 3 years ago. The problem was caused by one faulty 80 rectifier where the filament broke and fallen onto one of the plates. It caused a short-circuit from the high-voltage winding of the mains transformer to the ground. I was using a 3A fast blow fuse and the short-circuit current caused by the faulty rectifier wasn't high enough to blow the fuse. Consequently the transformer heated up and eventually blew up the winding. The transformer was carefully built by James Audio but apparently it can't withstand such high current for a long time. Ever since that event I became extremely cautious about safety. If you ever built a tube amplifier, ask yourself a question whether or not the amplifier will survive when a rectifier goes to short circuit. This is a common problem for the rectifiers with hanging filaments. And many people including me believe tubes with hanging filaments sound better.

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Written by 站長Chris Chang

Parent Category: Audio frequency circuits-en-gb

Published: 18 April 2012

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Recently received two Taiwan Huai off stay repair of antique airport, is I 幫 one Qing Qi 15 years Qian bought of push pull type 擴 big airport, type hao name airport is Western Electric KS-16608-L1, right international manufacture made of company is Dukane, I Yes antique airport not is cooked, root high speed circuit switched data Web Road found of information material, Dukane with Mcintosh in 1960 generation are has 幫 Western Electric generation workers health production over 擴 big airport, TV road design total is future since Western Electric, this KS-16608-L1 product is large, is used to replace the now you've is 貴 killer, WE124, was also set in place by place Pan broadcast system stub TV said system. This London production of Userboxes/Time is long, Dukane because of this facility, still has other facility providers, Web Find photos, Web Shield, and some panels at the bottom, guess nutrited high speed circuit switched data for different purposes have different mixes, both Zhang Seattle are below I found in the net the way a number of different configurations of KS-16608-L1 photo:

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Written by 站長Chris Chang

Parent Category: Audio frequency circuits-en-gb

Published: 17 May 2011

Hits: 5992

Recently wanted to start playing the LP Sung pan, you need head amplifier circuit, for easy to see, do not want to get too big, hand bian 剛 Audio Research SP9 MKII, data origin says've failed, while empty documents calculations upon hire kids have it repaired. Thanks to the Web path sends Prada 賜, Tel Aviv brochure is easy to find, fast due to this as well upon being hired, thus the problems are no big deal, is not voice it.