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Vietnam DIY amplifier National contest 2015
Vietnam DIY amplifier National contest 2015
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Old 7th December 2015, 05:09 AM   #1
viagraless is offline viagraless  Viet Nam
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Default Vietnam DIY amplifier National contest 2015

Good day everybody.
I am also member of http://www.vnav.vn as biggest audio/visual-forum in Vietnam today, it is very proud to introduce about annual national contest for DIY amplifier for huge tubes, which is funny named as "SUMO contest" due to big size of tubes.

As you may know, this kind of contest have been started since 2005 and 10th contest just been held in Hanoi last Saturday, Dec/04/2015.

The general rule/requirement for such contest are :

- Minimum Plate dissipation : 60W per tube
- General THD : ≤ 4% at 50W ( PushPull ) and ≤ 6% at 15W ( SE )
- Band with : 20 20kHz 2dB at 1W
- Noise : ≤ 5mV/ 8 Ohms ( non income signal )
- Output impedance : 8 Ohms
- Method of test : Blind test

( in fact we also have other annual contest for smaller tubes i will let you know latter )

Now i'd like to share some pics to DIYer, thanks for your interesting.
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Last edited by viagraless; 7th December 2015 at 07:36 AM.
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Old 7th December 2015, 05:34 AM   #2
viagraless is offline viagraless  Viet Nam
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There are 23 members registered to participate however, only 14 amplifiers are despatched ( may be our rules are too seriously ? )
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Old 7th December 2015, 05:43 AM   #3
viagraless is offline viagraless  Viet Nam
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Reference systems :
CDP : EMM Lab XDS1.
Amp : Conrad Johnson KT150
Loudspeaker : JBL Everest DD67000
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Old 7th December 2015, 05:50 AM   #4
viagraless is offline viagraless  Viet Nam
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And below are candidates :
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Old 7th December 2015, 05:59 AM   #5
viagraless is offline viagraless  Viet Nam
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And also here
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Old 7th December 2015, 06:03 AM   #6
viagraless is offline viagraless  Viet Nam
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All candidates have been tested very carefully to match the rules also not destroy expensive loudspeaker
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Old 7th December 2015, 06:13 AM   #7
viagraless is offline viagraless  Viet Nam
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We have beautiful receptionist at the gate but also serious examiners inside, they are recognized as the best audiophile in Vietnam today.
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Old 7th December 2015, 06:29 AM   #8
viagraless is offline viagraless  Viet Nam
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Around 250 members to come for listening, not only old man like you and me but also ladies and kids
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File Type: jpg IMG_5187.JPG (157.0 KB, 24 views)
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Old 7th December 2015, 06:46 AM   #9
viagraless is offline viagraless  Viet Nam
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Behind backdrop, technician team were very hard work, because all amplifiers are very heavy, yes very heavy and ... hot
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Old 7th December 2015, 06:53 AM   #10
viagraless is offline viagraless  Viet Nam
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After 04 hours of blind test, now all candidates were appeared
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