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Post by Deleted on Feb 12, 2011 11:02:04 GMT
On my MyrefC amp, I have also used solid silver wire at around 4mm diameter for output, as I had a bit knocking around for another project. Wow, 4mm solid core silver? You floored me again! Where did you get it? Care to share? Great to see you guys biting, should I say the grenade, instead of the bullet to advance the SOTA in diy. Yup, big hole in the pocket instead of the small bullet hole. Heh, heh, heh ............ Fantastic! Hi Chong yes i could almost feel that 4mm wire twisting in my hands, great for speaker wires. i did have some stranded silver stuff once that was nice but i like solid core for most things. ;D I'm pretty lucky to have got to that nice time of life when my daughter has left home and i have a little more disposable income and time on my hands. I must try to stay up for the night shift sometime take care
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XTRProf
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Post by XTRProf on Feb 12, 2011 17:25:58 GMT
i do like to use unscreened cables where possible and if i must screen i use a twisted pair (good name for a company) and only connect the screen to the sender end of the cable. as for special power cables, i can't hear any difference with those so i don't use them. Like I had said, I like screening for being able to make them directional. I'm able to hear the effect of this as that will make the sound more sublime and faster sounding (yes, more PRATTY). However, I prefer to make it directional the old Monster way and that is to earth the screen at the arrival end. Also, eventhough I couldn't hear any of those garbages with unscreened so far, I have more of a peace of mind with screened cables. Yes, I agreed with you that power cables makes a lesser or almost no difference than the IC. To me it still have some minute effect and being a guy who goes for the SOTA in every possible way, I can say it's a religion (ah, Frans I had used one of your terms here) to always do that if there is spare cash lying around and the time to go on a diy shopping spree. Again, screened and directional the way as described, if possible, is the preferred way. Welcome to the witch doctors hut Mr Chong come on in there's plenty of room. please excuse the smell of burning feathers Huh, you must be a Harry Porter's fan. I'm not but have all of his vcds, dvds and blurays except The Order Of The Phoenix, I think, due to my niece and nephews influence. Can say kind of Young At Heart still. I first heard Her on the Later with Jools Holland TV show. Her voice just made me stop and listen. lovely Heh, heh, heh, she usually comes to Singapore to dig gold. Still very mobile for a gal who was almost crippled by a terrible car accident. Let me check whether she's coming this year. Btw, check this out as well if you want to be floored as me, Mr Shaun! It's a must have as some members here did find out when I highlighted her here in one of the music thread some time ago. IMVHO, audiophile credential in the same league as those from Linn. Also, floored by the music, and not audiophile sound, is and still is ......... Do you have anything to recommend me? Look at my tagline in my avatar. The Pioneer is IMHO my best transport. smooth and detailed. the Marantz is not so good but re clocking it really upped it's quality as a stand alone player. the XRAY I've never really liked that much but keep it as a spare. Damn, it! I had missed the opportunity. Mr James (Bond ), if I remember correctly, where are you? Now I sound something like the Scooby Doo and James Bond movies, man!
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jonclancy
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Post by jonclancy on Feb 13, 2011 13:38:18 GMT
On my MyrefC amp, I have also used solid silver wire at around 4mm diameter for output, as I had a bit knocking around for another project. Wow, 4mm solid core silver? You floored me again! Where did you get it? Care to share? <Off Topic> Hi Chong, I picked this stuff up from the Oyaide shop in Akihabara a few years ago. It's not listed on the Oyaide website, but the shopfront has an area of small bins full of bits and bobs. Like Furutech IEC power sockets, connectors, silver wire etc. The strength of the Yen has almost doubled the cost of this gear - I bought some IEC plugs when the price was merely unreasonable, but not bonkers!! Until the Yen returns to 220/£, I don't think I'll be getting any more, despite the quality. I use their 75R silver digital (BNC) interconnect in my main system. It's a thing of beauty. However, I mean to get round to measuring my own SPDIF cables, as it's possible to make a rig to measure reflections and optimise performance. </Off Topic> I found my precision resistors Will sent me!! Will be continuing my stuffing exploits tomorrow. Cheers Jon
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XTRProf
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Post by XTRProf on Feb 13, 2011 15:31:15 GMT
I picked this stuff up from the Oyaide shop in Akihabara a few years ago. However, I mean to get round to measuring my own SPDIF cables, as it's possible to make a rig to measure reflections and optimise performance. Ah, Akihabara. A well announced and not to be missed joint in Japan for my fellow hifi countrymen too whenever going on biz trips there. Don't need to discover the optimised length as Oyaide already had done that for you. All their digital cables are 1.8m.
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Post by jonclancy on Feb 13, 2011 17:33:05 GMT
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Post by Deleted on Feb 15, 2011 15:00:09 GMT
With reference to the mention of using a 47pf input caps with a 50K vol pot and 100pf caps with a 20/25k pot.
What exactly is the difference between using one pot or the other, and which is favourable?
Cheers,
Chris
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jonclancy
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Post by jonclancy on Feb 15, 2011 16:04:09 GMT
On my MyrefC amp, I have also used solid silver wire at around 4mm diameter for output, as I had a bit knocking around for another project. Arrgh!! Sorry, I lied!! Measured the wire today and it's 2mm diameter!! That'll teach me to post from memory without checking my facts!! It's still good stuff, though!! A nightmare to solder to the huge copper binding posts I'm using, mind you... All resistors are now soldered into the Class A boards. I need some more transistors to complete the BOM. I'll be going through the cpa supples later see see what I have. Did you guys match your caps with an LCR/ESR meter? Cheers Jon
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Post by Deleted on Feb 15, 2011 20:46:07 GMT
Hi Jon Yahoo serious ? I think that falls into the same category as megabuck output resistors, and using solid silver wire instead of normal stranded heavy duty hookup wire, such as 7.5A mains lead offcuts for connecting between the PSU and JLH, and JLH to Class A modules ? Regards Alex P.S. I think some of Frans cynicism may be rubbing off on me ?
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Post by Deleted on Feb 15, 2011 20:52:13 GMT
With reference to the mention of using a 47pf input caps with a 50K vol pot and 100pf caps with a 20/25k pot. What exactly is the difference between using one pot or the other, and which is favourable? Cheers, Chris Hi Chris Using the 47pF with a 50K potentiometer/attenuator will permit a small increase in amplifier bandwidth. The advantages will be more obvious when playing genuine high resolution material.It is only a subtle difference though.Fit whatever quality potentiometer/attenuator that you can most readily source. Alex
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Post by Deleted on Feb 15, 2011 21:29:03 GMT
Oh no ...... I hope not!! ;D ;D You remind me of those teachers in the 50's and 60's. Stict but fair!!!! Frans is more yer 70's teacher - sarcasm and distance keeps 'em in check!!
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Post by Deleted on Feb 15, 2011 22:19:28 GMT
Cheers Alex.
50k it shall be then.
Chris
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Post by jonclancy on Feb 15, 2011 22:20:24 GMT
Hi Jon Yahoo serious ? I think that falls into the same category as megabuck output resistors, and using solid silver wire instead of normal stranded heavy duty hookup wire, such as 7.5A mains lead offcuts for connecting between the PSU and JLH, and JLH to Class A modules ? Regards Alex P.S. I think some of Frans cynicism may be rubbing off on me ? You mean well worth the money and effort? ?? Why bother matching anything? If a 40% cap variation is acceptable...
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Post by Deleted on Feb 15, 2011 22:48:11 GMT
Hi Jon Yahoo serious ? I think that falls into the same category as megabuck output resistors, and using solid silver wire instead of normal stranded heavy duty hookup wire, such as 7.5A mains lead offcuts for connecting between the PSU and JLH, and JLH to Class A modules ? Regards Alex P.S. I think some of Frans cynicism may be rubbing off on me ? You mean well worth the money and effort? ?? Why bother matching anything? If a 40% cap variation is acceptable... A +-20% variaton in electro capacitance should not be a problem in a well designed circuit, especially where a JLH or super reg is used. In fact, you could use 47uF electros in the Class A HA, and I doubt that you would notice any difference in audible performance. You are forgetting that there are already 2 in parallel on each rail, only separated by a relatively short copper track.I actually used 1 as 10uF in a previous version, and the perceived difference was very minute. It higher precision is needed, don't use electros ! I don't know of anybody else who tests their new stock electros for PSU use before installing them !
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Post by jonclancy on Feb 15, 2011 23:17:45 GMT
I don't either....
But, theoretically, if a film is use in a pass filter, then surely the freq will change with cap value?
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Post by XTRProf on Feb 16, 2011 1:40:28 GMT
Oh no ...... I hope not!! ;D ;D You remind me of those teachers in the 50's and 60's. Stict but fair!!!! Frans is more yer 70's teacher - sarcasm and distance keeps 'em in check!! Hey, I like your new avatar picture. You are definitely an '80s dude, man!
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Post by XTRProf on Feb 16, 2011 1:43:06 GMT
Did you guys match your caps with an LCR/ESR meter? Cheers Jon I do! Hah, sounds like a marriage solemnisation now ...........
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Post by Deleted on Feb 16, 2011 6:27:41 GMT
2 pin terminal blocks.Please ,make sure that the terminal blocks you use have pins longer than 3.5mm. Both Jeff C and myself have 2 working PCBs, but we had to use the locally available blocks with 3mm or 3.5mm long pins. These blocks will almost certainly cause trouble after the terminals have been tightened and untightened a couple of times, and may even fall out if turned upside down. Mine is now awaiting some TERMINALBLOCK, PCB, 2WAY, 5MM CTB1202/2 CAMDEN from Farnell (Element 14) in the U.K. as locally there are no stocks.These blocks have 4.5mm long pins and will protude through the bottom for a proper soldered joint. Alex Attachments:
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Post by jonclancy on Feb 16, 2011 12:00:55 GMT
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Post by Deleted on Feb 16, 2011 20:29:52 GMT
Hi Jon Will gave me that information. I reckon that black terminal blocks on a black PCB should look very nice indeed. Alex
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Post by jonclancy on Feb 16, 2011 21:46:10 GMT
Indeed!!
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Post by Deleted on Feb 18, 2011 1:41:30 GMT
Indeed!! Hi All I'm still waiting on the DACT to arrive but hopefully in the next few days, ;D i have however wasted some money on Home grown Cable Co 1mm solid core silver in PTFE sheath for the signal and OP duties. (twisted not stirred) I've used the .5mm before for some of my builds (tube)and like what it does. Jon i think Brian Cherry and Hifi Collective both seem to sell this stuff. take care
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Post by leo on Feb 18, 2011 22:30:15 GMT
Come on, lets see some pics
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Post by Deleted on Feb 19, 2011 0:00:25 GMT
Come on, lets see some pics Hi Leo When installed, mine will not look a great deal different to at present, because they will simply be replacing the existing modified SC PCBs. Also, although Jeff C and myself each have a couple of tested PCBs, we are waiting on replacement 2 pin terminal blocks from the U.K. as all the locally available blocks have pins of only 3 or 3.5mm length. This means that connections using the existing are not reliable, as the twisting action of screwing and unscrewing cables can fracture the soldered joint due to the pins not protruding through the 3mm thick PCBs.The ones that I have ordered from Farnell (Element 14) are black,have 4.5mm long pins, and should look even nicer with those beautiful black PCBs. BTW, when using OPA134 for the Offset corrector I.C. and a 3K resistor terminating the input, DC Out has been measured as 0mV on Jeff's and my own PCBs. Alex Uploaded with ImageShack.us
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Post by jonclancy on Feb 19, 2011 0:48:30 GMT
Very, very nice work there, Alex!!
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Post by Deleted on Feb 19, 2011 1:01:12 GMT
Very, very nice work there, Alex!! Hi Jon If you are wondering about those posts sticking out of the heatsinks, I intend using posts of the next size down and attaching small additional heatsinks to them.I would have preferred to have used larger heatsinks, but they are too tall for 1U rack cases. However, I am using the same sized heatsinks in existing HA without excessive temperature. Alex
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