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回覆 (273): Can I connect a 110V amp to a wall socket?
 
>Not recommendated if you dont feel safe about it……<  
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Just reading it makes me feel dangerous!  
 
 
thekong
13-03-25
13:35:38
回覆 (272): Can I connect a 110V amp to a wall socket?
A friend of mine called me yesterday and sound like he was in pain and lost tons of money in the stock market. After a few rounds of Q&A! I find out his problem is not an unusal one.  
 
He bought a pair of RCA monoblocks without realising they are in 110V mains and he was so deseperate to hook them up. He asked if I could spare hm a 220V to 110V cow that is big enough for the two RCA amps. The answer is no la! I really dont have lor!  
 
So here is a quick solution. Not recommendated if you dont feel safe about it and surley its meant to be a very short term solution. Afterall, its best and more proper to get a 220V to 110 cow for long term.  
 
What you see below is am example of how you can connect two mono blocks of 110V or a dual mono power supply amp having two seperate power transformers to our 220V mains.  
 
The two cows you see are both identical having a 110V connection. The middle two outputs in each cow are for 110V mains. What you do is to connect them in series. Be extra careful with the phasing. OK! When you connect two identical cows primary in series. The mains voltage will be shared between them.  
 
To get this to work. The two cows must be identical and the two amps must draw the same amount of current.  
 
Once gain, its not advisable to do it but if you insist and knowing its only for short term testing (not long term enjoyment). By all means!  
 
bobui
13-03-25
13:15:38
回覆 (271): League
Why I am still working 7pm for my day job. Its not fair!  
 
I'm only "Human"!  
 
bobui
13-03-22
18:52:11
回覆 (270): Human
Why I am still working 7pm for my day job. Its not fair!  
 
 
I'm only "Human"!  
 
bobui
13-03-22
18:50:36
回覆 (269): QSound
This is from an old album of Sting "The Soul Cages".  
 
The song/music is called "Saint Agnes and the burning train" - I think is orginated from a Spanish song.  
 
The album recording is very good on LP form. For the first time, Sting adopted the Q Sound system into this album. QSound is a prositional three dimensional 3D sound processing method that creates 3D audio effects from multiple monophonic sources.  
 
Only about 15 ablums were ever recorded with QSound and they were all from the early 90s such as Pulse by Pink Floyd, Dangerous by Michael Jackson.  
 
Enjoy!  
 
bobui
13-03-21
13:10:04
回覆 (268): Like father like son
My brother has given birth of a son for the Wong family. Thats the closest I get!  
 
This song from a recent adv was actually written by Geroge Lam himself. Lyrics by Calvin Poon Yuen-leung. I like ar!  
 
Dont you?  
 
bobui
13-03-11
20:57:06
回覆 (267): Home Sweet Home
BTW - Home Sweet Home ..... My Supratek is now home again !!! Life is good !!! 8^)
daiwok
13-03-03
19:26:03
回覆 (266): Home Sweet Home
I wanted these when I was a student as well !! 8^)
daiwok
13-03-03
19:25:25
回覆 (265): Home Sweet Home
Took deliver of a Meridian oldies home last night. Wah! Wah! Wah! Come to hear it yourself and tell me if which one you prefer lor! The Meridian or the Naim CDX.  
 
My school time dream CD combo finally came home to daddy - "Home Sweet Home"
bobui
13-03-02
10:53:43
回覆 (264): Khovantschina
Have resume working on my PPP 811-10, 100Watts power amp project recently.  
 
In the mean time, allow me to give you something unusual. Try not to DONT CRY!  
 
If you are steady, in peace and alone, listen to this and I assure you will like it!  
 
Tears!  
 
bobui
13-02-26
22:02:08
回覆 (263): La Traviata in Hong Kong
There you are!  
 
bobui
13-02-25
10:04:52
回覆 (262): La Traviata in Hong Kong
Hong Kong Arts Festival 2013 - The La Traviata is coming in March at the HK Arts Festival. This time with a very very reputable and good casting by San Carlo Theatre. Tickets on sales. Get them before too late lor  
 
Here is a little highlight we all knew so well!
bobui
13-02-25
09:58:45
回覆 (261): Best Wishes from everything DIY!
Wah! Wah Wah! I am the new comer lor! You know what? The thing is:  
 
If you are very comfortable with the current asking price for let say a quad set of original box NOS GEC or Gold Lion. Then why not! Hey, you 9 to 5 man! Reward yourself on your hard earned cash la! Orginal GEC, "cant be too bad" lor. At the end of the day, the resale value is second to none when compare with any other KT88s. That is very measurable lor!  
 
If you happen to be having a huge mortage and already committed to many other toys and hobbies. Then, why not spend your money on various different makes of KT88s other than the GEC. At the end of the day, all you ever want is to have fun. Right?  
 
As the English say "Means to an end" choose what you prefer.
bobui
13-02-19
22:31:51
回覆 (260): Best Wishes from everything DIY!
Belated Happy New Year.  
 
Being stuck in office, as well throw in my worthless 2 cents and catch some fun.  
 
Actually, new or NOS is more about music preference. Some famous NOS versions are relatively smooth, some have glorious mid-range (a bit roll of at both ends depends on how you phrase it). Yet, is smoothness and sweetness always a plus?  
 
At the end of the day, we choose our tube for our system. I like dynamics and punch and don't mind a bit or coarseness, I therefore like some cheap new Russian tubes better. If I find my system a bit to the cold side, I may wanna use some warmer sounding tubes (Maybe NOS, maybe not.)  
 
The key is to understand the character of each version and what is needed for our own setup/taste.  
 
All hifi gears are like spices and herbs. No simple answer of any sort and thus, I remain clueless as usual. :-)  
BenYC
13-02-19
13:49:51
回覆 (259): Best Wishes from everything DIY!
>The truth is Valve characteristic has very little to do with good sound! <  
>Sound quality, very subjective la!<  
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If that is true (which I am not questioning), then there is no reason why a current make KT88s fitting the characteristic standard set by GEC, couldn’t SOUND better than the original subjectively, correct?  
 
Actually, my comment is not for the experienced tube users, who, of course, don't need my advice on tubes. My comment aimed to let newcomers know that they don’t really NOS to get good sound, and NOS are not always superior in all applications, at least subjectively!  
 
thekong
13-02-19
13:26:07
回覆 (258): Best Wishes from everything DIY!
as you mentioned, assuming current make KT88s could satisfy the characteristic standard set by GEC, is they any reason why they can’t be at least equal to the GEC KT88s?  
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What I am about to say is either what most Hi Hands here already knew better and you would just thank me for reminding you or what you would totally disagree and want to send me back to the bike thread a few clicks away from here in this site.  
 
The truth is Valve characteristic has very little to do with good sound! Oh, dont get me wrong please, because I do believe that a healthy measured valve is a must when buying or choosing.  
 
Let me give you some examples. In the hey day of valve production from the 40's to 80's. Valve manufacturers (VM) have only the following few things they wanted to concentrate to make continous improvement.  
 
1. Efficiency: For a given Anode voltage and cathode current, VM wants to increase output efficiency. Hence the development from troide to pentode such as the 2A3 to EL34.  
 
2. Long life: Need not to say more, safe time and money for sending over a team of tech guys to plug and unplug or even have to do extra repair work on the telecommunication equipment when valve failed.  
 
3. Patent war: Yes, thats right. There were plenty of competitions between VMs and countries for Patent rights. The birth of the KT series valves were the result of a patent war between GEC and RCA and Mullard. Mullard had the pentode patent. RCA was shining brightly with their 6L6 family tubes. GEC needed to do something to gain market and control. The KT66 was aiming right at the 6L6 family! The GEC KT88, sure you know was pointing at the 6550 as a mroe reliable valve.  
 
Other than some valves which specify as UHF, VHF or audio frequency in any valve manuals. I have never come across any descriptions telling users that which particular characterics measures reflect a more faithful reproduction of a particular type of music or frequency extension. Have you? See!  
 
Even if there was ever any hint from any VMs on a valve that is so special for sound repoduction, all I can think of is in fact the selected few such as KT88s that offer long life and reliablity for PA use or the 60 to 70s guitar amps which require a very unique distortion repoduction for the weeeeaaaaaaaaaa sound we all like so much. May be the 300B and PX25 if you so prefer lor!  
 
The valve characteristic reflects the advancement of the valve design and its application. Thats as far as it goes. Sound quality, very subjective la!
bobui
13-02-19
13:04:12
回覆 (257): Best Wishes from everything DIY!
>The core of the issue, however, is quality control which has yet to be effectively resolved. This is the area where a large number of current productions fail.  
 
I have not tried Chinese tubes and given the present equipment and tooling, they ought to be better than the Russian makes. <  
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Reliability was certainly an issue of Chinese made tubes 5-10 years ago and earlier. However, in past 2-3 years, there seems to be some boutique style tube manufacturers (or a special department of a large tubes maker) offering higher price audio tubes. Take the KT88s for example, they are priced higher than the Russian Reissue Goldlion KT88s!  
 
I have never used these tubes, but comments on various forum indicates that some users prefers them over the Reissue GL KT88s.  
 
Given that these higher priced tubes are targeting at the highend audio market, I would assume they have much better reliability/QC than before. Of course, as they are still quite new, only time can tell if that is true!  
 
 
thekong
13-02-19
12:18:56
回覆 (256): Best Wishes from everything DIY!
 
>If was GEC who named it KT88. If one want to refuse or be better in measurement than the GEC KT88………<  
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I take your point! But then, as you mentioned, assuming current make KT88s could satisfy the characteristic standard set by GEC, is they any reason why they can’t be at least equal to the GEC KT88s?  
 
thekong
13-02-19
12:03:04
回覆 (255): Best Wishes from everything DIY!
中國人發明火藥,所以大陸膽靚,夠爆炸力! 挑:-)  
Have a great week gents !
Cadiver
13-02-19
11:55:04
回覆 (254): Best Wishes from everything DIY!
 
 
Totally agree. If someone can make a better tube, give it a new name. I guess that's what the Russians are doing. The core of the issue, however, is quality control which has yet to be effectively resolved. This is the area where a large number of current productions fail.  
 
I have not tried Chinese tubes and given the present equipment and tooling, they ought to be better than the Russian makes.  
 
 
limage
13-02-19
11:36:28
回覆 (253): Best Wishes from everything DIY!
A valve tester measure the very few basic parameters of a valve to define the overall working condition according to the designated characteristic standard. For KT88, GEC is the orignial manufacture that set such standard. Valve tester use this standard or characteristic for measurement and I suppose some valve amp manufacturers also apply this standard when designing their circuits. If was GEC who named it KT88. If one want to refuse or be better in measurement than the GEC KT88. Then why not simply name the new valve differently which is all fine. Thats why we see there such valves in the market such as the KT90, KT100 because these maufacturers realise they are making something that already deviate from the original KT88 characteristic/standard in order to acheive a better measurement or even sound given today materials and production limitation!  
 
Take a look at the car or most other industries. If one car manufacturer can break the performance record and make a better car, surely it would name this new venture differently and give it a new model name or even brand.  
 
You can be better but you will never be the original. And if one is so good at what he or she does, then set or define a new standard and name it differently lor!
bobui
13-02-19
11:13:45
回覆 (253): Best Wishes from everything DIY!
 
Thanks Limage, exactly what I thought! Nice to have the confirmation!  
 
thekong
13-02-19
10:43:12
回覆 (252): Best Wishes from everything DIY!
 
 
If the tube measures good, it is good. Brand names make little difference, much less their outlook.  
 
I switched to Svetlana 6550 because the GEs were 3 times more expensive. I could not spot any difference.  
 
You may well disagree of course, but my CJ seems very happy with lesser lbrands.  
 
 
 
limage
13-02-19
10:20:28
回覆 (251): Best Wishes from everything DIY!
>Every Manufacturer says that their new tube is better than GEC ba ba ba..... <  
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This is an interesting topic, but then, why should we believe GEC, or any other NOS for that matter, be always superior to the current makes?  
 
Do the NOS always have better materials, craftsmanship, or QC? I have heard stories that some materials use in the vintage tubes were deemed hazardous to health later on and abandoned in later makes. Is there any truth to it? If it is true, then what materials were they, and since when have they been abandoned?  
 
Would the superiority of the NOS always shown up in measurements, or it is just a matter of better sounding?  
 
Correct me if I am wrong, but it seems to me many, if not most, of the NOS advocates are also users of vintage gears, and I think this is no coincident! The vintage gears were tuned with NOS tubes when designed, so it is no surprise that they sound better with NOS tubes! However, how about modern gears that were tuned with current make tubes?  
 
Limage is probably the one with the most experience in tubes, and most meticulous in measuring and recording the data, in this forum. So, I would appreciate if he could comment on the follows:  
 
1. If different brands of tubes share similar measurements, would they tend to sound similar, or they could still sound vastly different?  
 
2. When using in the CJ Premier One, is there a big different between the GE6550 (or any other 6550s you have used before the GE) and the current Svetlana? Do you see a big different in terms of reliability and longevity?  
 
thekong
13-02-19
08:54:33
回覆 (250): Best Wishes from everything DIY!
Every Manufacturer says that their new tube is better than GEC ba ba ba.....    
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Wait till they have the guts to say their newly manufacture is the one to beat, become the new standard for all. Until then, I say. What the fuss?
bobui
13-02-18
22:49:10
回覆 (249): Best Wishes from everything DIY!
 
 
Do they really listen to the original GEC ?  
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Probably not, cos’ they only listen to passé ones, or even worse, the fakes.  
 
 
limage
13-02-18
20:29:20
回覆 (248): Best Wishes from everything DIY!
Every Manufacturer says that their new tube is better than GEC ba ba ba.....  
Do they really listen to the origianl GEC ? ka ka ka.....
accphoto
13-02-18
15:16:31
回覆 (247): Best Wishes from everything DIY!
DIY bobui with you all success and good health! Be Nice!  
 
 
DIY home cook!
bobui
13-02-09
21:06:33
回覆 (246): To Mr Welborne,
No problem...HOT girl comes first, always :)
Welborne
13-02-06
13:16:14
回覆 (245): To Mr Welborne,
Hi Welborne,  
 
Deeply sorry! I've been awfully busy with my new girl friend out up The Peak recently. She is soooooo HOT! Would spend some time hooking up my valves on the AVO-160 and let you know if those EL84 are good to go.  
 
Yours,  
bobui
bobui
13-02-06
13:09:16
回覆 (244): To be, not to be "KT88"
Sorry post 錯位
Welborne
13-02-04
20:20:08
回覆 (243): To be, not to be "KT88"
請教大家:  
我想進入CAS ,電腦方面應該買乜?軟件就大約知道是JPlayer....  
 
感謝。
Welborne
13-02-04
20:19:38
回覆 (242): To be, not to be "KT88"
No problem, just get 32 of them and give me a call! :-)  
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Let me make it easier! OK! Just send me a quad of your Gold Lion and have them compared at my place lor!  
 
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May be different now because they are independent states.  
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I do not carry much confident in Czech tubes either but somehow this GEC look alike KT 88 tubes really caught me by surprise with their so many positive reviews. My quad have been sitting around for some years before i got round to give it a hard try on my amp set at plate 450v triode connected. After more than 4 days continous run in, these Telsa seems stable and sound surprisingly good. Hence the sharing lor!  
 
bobui
13-01-25
21:41:24
回覆 (241): To be, not to be "KT88"
 
>Interested to compare them with current replica Gold lion!<  
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No problem, just get 32 of them and give me a call! :-)  
 
 
thekong
13-01-25
12:33:18
回覆 (240): To be, not to be "KT88"
 
 
I had bad experience with Czech tubes but they were dual triodes mainly, like ECC 81, 83, 85 and 88. Couldn't survive one week!  
 
May be different now because they are independent states.  
 
 
limage
13-01-25
11:56:00
回覆 (239): To be, not to be "KT88"
Tesla KT88. After Tesla disappeared from the Market early 2000s. They rebrand it as EAT Diamod KT88.  
 
Sound: Good ar! I like lor! Interested to compare them with current replica Gold lion!
bobui
13-01-25
09:41:14
回覆 (238): To be, not to be "KT88"
No lor! Its not the Chinese. Its not the Russian either! Well, let me give you a hint!!!!, Its over USD1,000 for a quad set new in 2013. Some say they sound even better than original GEC.
bobui
13-01-25
07:37:08
回覆 (237): To be, not to be "KT88"
300B sound boring, no slam and weak bass! Right? How about a re-visit to our faithful friend, the KT88........  
 
On the right is the very faithful original GEC KT88. One the left? Well, do look closely and you can see the plate construction, getters and tube shape resemble very closely to the orignial, right? Other than the slightly lighter grey colour plate/anode and black bottom base, the two tubes looking almost identical!  
 
bobui
13-01-25
07:33:46
回覆 (236): Time for a glass of ARGBEG
 
今年訪港末有机會同所有師兄一聚,今曰泥過格網敬酒 "all-in",飲杯!!  
Cadiver
13-01-01
15:34:02
回覆 (235): Time for a glass of LAGAVULIN
Bobui, i can wait. Just update me. Happy New Year
Welborne
12-12-30
23:06:09