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回覆 (242): spot welded cables
 
when your Maggie is back in her place, you can have my welder to play around if you want.  
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Good Derek, we are going to have an orgy of audio parties when my room is ready. It won't be long now.  
 
Don't be surprised though when you find buddies having their fingers welded!  
 
limage
11-08-31
16:42:54
回覆 (241): spot welded cables
Not so easy with some brands. The tube connections are welded into their respective pins from the inside.  
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if they can't be unsoldered with a solder pot, you can certainly cut it open with many tools. think about this. how many tubes do you need to destroy accidentally before you can recover the cost of the welding tool?
drwkng
11-08-31
16:06:55
回覆 (239): spot welded cables
welded tube pin contacts ought to bring sonic purity that is nothing less than sublime!  
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That's what exactly I have in mind, but need to wait till the cable exercise end. Or else, when your Maggie is back in her place, you can have my welder to play around if you want.  
Derek2A3
11-08-31
15:50:03
回覆 (240): spot welded cables
 
 
Not so easy with some brands. The tube connections are welded into their respective pins from the inside.  
 
limage
11-08-31
15:46:02
回覆 (239): spot welded cables
limage,  
 
wouldn't it easier to get rid of the tube base for octal tubes?
drwkng
11-08-31
15:23:36
回覆 (238): spot welded cables
 
 
in fact it's the parts to be welded that turn out to the be the biggest hurdle  
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That's why I find the two probe terminals come in handy in refined operations like the DIN sockets.  
 
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My original intention was in fact to weld the output tube pins into 1 mm single wires which in turn are to be soldered  
directly onto the circuit board, doing away with the tube sockets and their related discrepancies altogether. That should  
ensure perfect stability as well as pure signal flow regardless of temperature changes right at the most critical of the  
final amplification process.  
 
If a welded signal cable has already made tangible improvements, these welded tube pin contacts ought to bring sonic  
purity that is nothing less than sublime!  
 
The jelly fish has proven its worth beyond doubt. I want to go one final step deeper into the core issue.  
 
 
 
 
limage
11-08-31
15:11:37
回覆 (237): spot welded cables
The Sunstone looks easy to operate, but in fact it's the parts to be welded that turn out to the be the biggest hurdle. Picture five gauge 22 wires to be welded to a 5 pin DIN plug, even the probes of Sunstone on the clip would be too big.
Derek2A3
11-08-30
21:11:26
回覆 (236): spot welded cables
 
>The Evil Kong, should we form an 銀團 for this project? Then charge daily rental of HK$2K plus consulting fee? ROI compelling enough? <  
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Why renting the machine out? We can just make spot welding cables using the Gotham, dress them up with some big modules, and sell for $50K+ a piece. Now, that’s the kind of ROI I am looking for! ;-)  
 
Another lucrative project for the 粉腸Audio Consultancy. CP, do you hear me?  
 
 
thekong
11-08-30
18:07:16
回覆 (235): spot welded cables
Considering a highend cable can easily cost more than $20,000, this may turn out to be the bargain of the century!  
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It's a pity that I could find nothing like the Sunstone up north or else we would probably get one below 3K.  
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As I understand those high end temp controlled soldering iron that Dr. King literally throw away on a regular basis cost more than HK$3K a pop..... so this Sunstone thing looks professional enough for a little more premium, at least.  
 
I heard from Wher gor, the use of 2A3's tool is not as easy or as efficient as people think. The Sunstone thing looks like a breeze to use.  
 
The Evil Kong, should we form an 銀團 for this project? Then charge daily rental of HK$2K plus consulting fee? ROI compelling enough?  
icefox
11-08-30
17:54:07
回覆 (235): spot welded cables
Are you guys using something like this ? price is less than 5000 人 仔
http://item.taobao.com/item.htm?id=8289996346
daiwok
11-08-30
17:48:43
回覆 (234): spot welded cables
 
>looks perfect except the price. At $20,000 HK, it's not terribly cost efficient. <  
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Considering a highend cable can easily cost more than $20,000, this may turn out to be the bargain of the century!  
 
thekong
11-08-30
17:07:50
回覆 (233): spot welded cables
let me help .........
daiwok
11-08-30
16:35:55
回覆 (232): spot welded cables
 
It's a pity that I could find nothing like the Sunstone up north or else we would probably get one below 3K. I have the  
feeling that the Sunstone may be made in China too.  
 
limage
11-08-30
16:32:08
回覆 (231): spot welded cables
朋友, 咁你仲等咩呀? 快啲攞嚟試吓啦!  
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Let me get some cables - I want to go direct ! from cartridge to RCA. I can then mount on my linear tracking arm !  
 
daiwok
11-08-30
15:57:12
回覆 (230): spot welded cables
Don't worry - I have 6 x of the same cartridge - so plenty to test !  
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朋友, 咁你仲等咩呀? 快啲攞嚟試吓啦!
Derek2A3
11-08-30
15:52:50
回覆 (231): spot welded cables
looks perfect except the price. At $20,000 HK, it's not terribly cost efficient.  
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籌旗,籌旗,籌旗!!! Cheaper than a Keith Monk Record Cleaner........ the return is ....... haha!!
icefox
11-08-30
15:41:57
回覆 (231): spot welded cables
since this is a DIY thread, so why not make your own !
http://www.instructables.com/id/Homemade-Spot-Welder/
daiwok
11-08-30
15:41:04
回覆 (230): spot welded cables
 
These are the welding tools I have been looking for:  
 
The two probes provide great flexibility while the tweezer hand piece is an absolute bliss to use. Everything  
looks perfect except the price. At $20,000 HK, it's not terribly cost efficient.  
 
 
limage
11-08-30
15:20:31
回覆 (229): spot welded cables
Not sure if the delicate wires & coil within the cartridge can survive the heat generated during the spot weld procedure.  
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Don't worry - I have 6 x of the same cartridge - so plenty to test !
daiwok
11-08-30
15:17:40
回覆 (228): spot welded cables
I had three beers.  
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If you looking for an assistant. Give me a shout! I am happy to offer my service.  
 
Sorry, no mini skirt and stocking!
bobui
11-08-30
15:09:07
回覆 (227): spot welded cables
Thanks bobui. What a pity you were not there, I had three beers.
Derek2A3
11-08-30
14:54:26
回覆 (226): spot welded cables
I can provide a cartridge to have the cables spot welded direct to the terminals ^__^  
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Not sure if the delicate wires & coil within the cartridge can survive the heat generated during the spot weld procedure.
Derek2A3
11-08-30
14:52:29
回覆 (227): spot welded cables
Derek2A3, Congratulations to your success on spot welding!
bobui
11-08-30
14:51:41
回覆 (226): spot welded cables
Congratulations to your success on spot welding!
bobui
11-08-30
14:50:06
回覆 (225): spot welded cables
I can provide a cartridge to have the cables spot welded direct to the terminals ^__^
daiwok
11-08-30
14:32:22
回覆 (224): spot welded cables
Have you tried multi-strand BTW?  
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The blind test conducted at Wher's studio were all multi strands including Gotham & no solid core. Before I was afraid that multi strands can't be spot welded, turned out the strands themselves welded together & joint to the connector, too good to be true ah! But still, solid core is much much easier to handle.  
 
 
I suppose it is time to start mass production! ;-)  
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Not yet, this SAT, we are going to have another blind test - multi strand Vs solid core.
Derek2A3
11-08-30
14:22:59
回覆 (224): spot welded cables
 
I was told the relatively cheap cable with spot welding had trounced some much more expensive factory terminated cables!  
 
I suppose it is time to start mass production! ;-)  
 
 
thekong
11-08-30
14:10:47
回覆 (223): spot welded cables
 
 
before commiting to the next pair of interconnect.  
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and save yourself twenty thousand bucks!  
 
 
Have you tried multi-strand BTW?  
 
limage
11-08-30
13:58:01
回覆 (222): spot welded cables
Derek2A3
11-08-30
13:37:54
回覆 (221): spot welded cables
Derek2A3
11-08-30
13:36:25
回覆 (220): spot welded cables
Thanks to Ah Wher for hosting the cable blind test. Even with only a handful of participants, event turned out to be a success. In short, you owe yourself an audition before commiting to the next pair of interconnect.
Derek2A3
11-08-30
13:34:25
回覆 (219): Speaker Impedance matching
Seperate power supplies  
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That's cheeky, Kong!!  
 
 
if money can buy and u have it, buy it.  
If money can buy and u dont have it, DIY it.  
 
bobui
11-08-24
19:09:34
回覆 (218): Speaker Impedance matching
 
>Only the good and the ugly took all the gold coins at the ending! Ah Ah.<  
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And they both ended up with preamps that had separate power supplies! :-)  
 
 
thekong
11-08-24
17:24:40
回覆 (217): Speaker Impedance matching
Bobui - mr full ranger  
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Since limage is 'the good", icefox is "the bad", I have been so worried that I would end up being "the ugly". Seems to me that "full ranger " is a better option. Thanks a lot, my friend!  
 
Oh if you do remember the last part of the film "the good, the bad and the ugly". Only the good and the ugly took all the gold coins at the ending! Ah Ah.
bobui
11-08-24
13:02:01
回覆 (216): Speaker Impedance matching
Nelson Passon full range distortion.  
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Please do diawok, I am at learning mode on this topic. Not only because its a very hot topic at beer hours. The reason I find it so exciting is that nearly all high hands do always hear the difference when changing output taps (ohms) which most of the time if not all can be traced back to the theory behind.  
 
I do remember you told me how your speakers are connected and i am longing to hear and see them live.  
 
Its bloody fascinating when difference can be explained. More so when people experiement.
bobui
11-08-24
12:45:19
回覆 (215): Speaker Impedance matching
Bobui - mr full ranger  
 
Take a look at the article written by Nelson Passon full range distortion. I am notin town but will try and find let you read it. Basically, he talks about current load where you are using a 4 ohm tap on 8 ohm speakers. The sound is more natural, more smooth, less peak distortion. Now my AER MD3 are 16ohm but I have put a graphite resistor to drop the speaker impedance down to 4 ohm. Incidentally my bass unit is also 4 ohm. Both drivers are driven by my Yamamoto with 8ohm tap. I spoke to Shigeki-San about winding me a transformer with 32 ohm tap, but the best he can offer is 16ohm with 10k rather than my current 8ohm with 5K, so for now I just resort to the graphite resistor as a cheap way out. Not perfect but I like the outcome.
daiwok
11-08-24
12:29:08
回覆 (214): Speaker Impedance matching
That's a topic where conclusion cannot be drawn on paper except trying it out with a real test. Speaker manufacturers only serve us the nominal impedance, so with different speaker/valve amp combo, you have different distortion & power pattern which is frequency dependent.  
 
With the 4 ohm tap, we have less distortion, but on the other hand, we got less power. Besides, you only utilize roughly only 2/3 of the secondary winding unless your amp comes with an output with multiple individual secondaries.  
 
Having said that, most of the time it's the 8 ohm tap that people prefer. Why not just listen to it & trust our ears.
Derek2A3
11-08-24
12:10:56
回覆 (213): Speaker Impedance matching
A friendly sharing of a popular topic keep coming up during many recent happy beer hours with high hands: "Speaker impedance matching with valve amps".  
 
Lets take a typical 300B single ended amp output stage as talking point. OK? Agree? So typically the 300B would be running at 350 to 400 dcV at 60ma with an output transformer of 3k anode load in the primary winding and an 8 ohms output tap connected to a million dollar worth 8 ohms speakers. Everything works perfect until one day you heard rumuors that your million dollar speakers has a very low impedance at certain frequencies which gives a hard time to your billion dollar worth valve amp! So as suggested by friends, you connect your million dollar speakers to the 4 ohms tap at the back of your valve amp terminals.  
 
Here is the queries. Why the sound become more compress, not open, and may even be described as a bit dull with the 4 ohms tap? And one may even say that it is not subjective because blind tested many high hands, they mostly come up with similar comments.  
 
Here is my sharing (correct me if i am wrong please): When connect your 8 ohms load (the million dollar speakers) to the 4 ohms output tap, the 3k anode load in the primary winding is no longer a 3k anode load. It double up to 6k anode load. When the impedance change on one side of the transformer winding, the other side change in equal proportion. And when you do that to your billion worth valve amp/transformer, this also degrade frequency response. Most obvious to the high frequency.  
Also the higher anode load to the 300B means that you probably get a lower distortion and there is a lot of talks about even order distortion contribute to the warm sweet sound of valve amps!  
 
 
 
bobui
11-08-24
11:46:28
回覆 (212): What 300B is good enough for Goto??????
To the photogrpaher,  
 
Satisfaction and after service report  
 
Heard RUMOURS that the Emission 300B was no good for the Goto. The sound become too aggressive, congested and overblow. Ahhhhhh, oto sum it up, the Emission was not good enough for your goldern ears. To compensate, I have the following recommendation.  
 
My secert weapon as picture below to you next week!  
 
 
bobui  
Department of Correction  
bobui
11-08-22
09:44:53
回覆 (211): Goto Full Monty
What a knowledgeable and understanding wife  
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Mrs bo bui thinks Hi Fi guys are generally very very smart people. More so with DIY guys. Of all the high hands she has met, there is only one she disagree with. Me lor!
bobui
11-08-15
18:28:33