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Post by kaushama on Mar 18, 2007 14:46:01 GMT
Hi PinkFloyd! From where in Uk I can get those Sprague Koolohm resistors? I am waiting for my Can amp and have chased the sources of most of the parts for a full scale modding project. I have another question. Is it a good idea to increase the capacitance of the power supply by inserting 10000Uf caps. The snubbers there should have been calculated or optimized according to the 4700UF caps probably! Wouldn't that disturb the synergy of the components? Have noticed a difference in SQ by doing that? I was first thinking to drop 4700UF Low esr caps there.
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Post by kaushama on Mar 18, 2007 17:28:52 GMT
And further is it ok to use (RSS part 485-2805) Vishay RWM Series Enamelled Wirewound Power Resistor 6W 100 ohms in place of power resistor as Is is the one available at RSS. Will make savings in shipping.
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darynalexander
100+
will probably give you some sort of disease.
Posts: 179
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Post by darynalexander on Mar 19, 2007 17:30:01 GMT
Heheh. I wasn't even paying attention to this thread. The sparks would be coming from the resistors, and I'd bet they touched the heatsink because it came from that side on each resistor and once I moved them (while they were sparking. yeah, I'm dumb) it stopped.
I sent it on the 3rd. The post office assures me it will be delivered today.
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Post by PinkFloyd on Mar 19, 2007 17:37:53 GMT
Heheh. I wasn't even paying attention to this thread. The sparks would be coming from the resistors, and I'd bet they touched the heatsink because it came from that side on each resistor and once I moved them (while they were sparking. yeah, I'm dumb) it stopped. I sent it on the 3rd. The post office assures me it will be delivered today. Arrived two hours ago Daryn, I'll take a look at her tomorrow Resistors / heatsinks / sparks.... possible you've wiped the BD-139 I have plenty so will replace them as a matter of course..... I'll keep you posted. Mike.
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Post by PinkFloyd on Mar 19, 2007 17:45:44 GMT
Hi PinkFloyd! From where in Uk I can get those Sprague Koolohm resistors? Unfortunately I've run out of them.... sent the last pair out a few days ago... you could maybe find them on the net, 100ohm 10 watt Koolohm. Quite the opposite, the 10,000uF caps make the amp sound MUCH better across the board. As far as I can remember the 4700uF were not bypassed with a film cap (I'll double check when under the bonnet with Daryn's canamp) I'll return to this thread to confirm. For sure, try them but I think you'll find 10,000uF make a big improvement.
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Post by PinkFloyd on Mar 19, 2007 23:20:43 GMT
Heheh. I wasn't even paying attention to this thread. The sparks would be coming from the resistors, and I'd bet they touched the heatsink because it came from that side on each resistor and once I moved them (while they were sparking. yeah, I'm dumb) it stopped. I sent it on the 3rd. The post office assures me it will be delivered today. Arrived two hours ago Daryn, I'll take a look at her tomorrow Resistors / heatsinks / sparks.... possible you've wiped the BD-139 I have plenty so will replace them as a matter of course..... I'll keep you posted. Mike. Decided to get straight into her.... she's working... didn't bother testing anything I went straight in with two new BD-139 (the two I removed tested fine so no probs there) tested and refitted the spragues (this time insulating them from the heatsinks ) fired in a dip8 socket (and inserted AD-823) tidied up the bypassing under the board, rewired the headout.... blah blah blah.... gave her a good clean with isopropyl and Bingo.... she's alive Put her all back together Daryn and she'll be on her way back to you on Wednesday better than new (in both sound and appearance) You actually made a bloody good job of the soldering Daryn, just remember the heatsink is connected to the transistors collector so we don't want resistor legs touching the heatsinks Mike.
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Post by dc on Mar 21, 2007 4:19:46 GMT
I thought i'd share my opamp experiences with y'all now that i feel my canamp has well and truly settled down, it would have no less than 400 hours clocked on it now i've been using the AD823 this entire time since modding it and like it very muchly, good tight punchy bass and crisp treble extension. this opamp to me has a great anti-bur brown sonic signature, which i cannot stand. given that the LM4652NA is such an excellent opamp that has done wonders for my Zhaolu DAC I figured i'd give it a go, as others have also reported favourably about this little beauty. i dropped it in and the Canamp sort of lost the "on steroids" affect, and became a much more subdued polite sound that although probably is quite accurate and true, lacks the smack bam in your face effect that the AD823 has. it also seemed just a bit flat sounding all round, dare i say "veiled" it was for this reason i almost didn't bother with my bunch of burr brown opamps, but thought what the hell. threw in an OPA2111, OPA2107, OPA2604. that's the order that i put them in and also my order of like > dislike. too slow, flabby and overall coloured and smeared around the edges for my liking. i'm sure to some this would be considered pleasant and "euphonic" but it just kills the amp imho lastly i had a mystery DY2000 that came included with my Zhaolu but that i've put out of commission since receiving my LM4652NAs. i truthfully wasn't expecting anything from this little fella, and figured since i had it lying around why not do a complete comparo. all i can say is WOW, the DY2000 has everything i love about the AD823 including its snappy tight bass slam, as well as crystaline highs but for some reason on a number of different tracks the bass had this scary realistic bass "texture", i thought i might be crazy but tried several different tracks and noticed the same thing, it has slightly better extension and this bass texture. initially i thought it was distortion, or maybe it is, but it sounds damn good so i'm keeping it! so yeah, that's my experience overally, i don't know if there's any other opamps that might be worth trying, but in my system and with my mods this DY2000 is incredible, afaik you can only get it from www.diykits.com.hk and it's some mystery opamp that was made by analog devices but yeah, give it a try if you can but the AD823 is everything the DY2000 is except for that bass realism that i can't quite describe hope this helps! also i look forward to seeing how the transformer goes!
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Nigel
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Post by Nigel on Mar 21, 2007 10:58:17 GMT
dc
Thanks for the heads up. Looked at the site you mentioned, is it 100 dollars to buy? Is it really worth getting?
Best,
Nigel
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Nigel
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Post by Nigel on Mar 21, 2007 11:05:59 GMT
dc,
Also, it says metal can or ceramic - 275 dollars? Big difference in sound quality as well?
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Nigel
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Post by Nigel on Mar 21, 2007 11:09:58 GMT
My mistake, Hong Kong dollars!
Unfortunately, the site email address appears to be non-existant.
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Post by PinkFloyd on Mar 21, 2007 11:27:27 GMT
Yes, I apologise kaushama I totally misread things (as per usual!) so please excuse me for my snappy remarks.
Mike.
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Post by kaushama on Mar 21, 2007 19:42:34 GMT
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Post by dc on Mar 22, 2007 0:09:55 GMT
nigel: they're in HK dollars lol! as you've now figured out also, you want to be using the DY2000 ceramic as it is in DIP-8 format, the metal is not it looks like it could fit in a DIP 8 socket i dont know what the benefit is though you can order by emailing eddie wu: info@diykits.com.hk / eddiewuhk@netvigator.com and kaushama: polyprops are HUGE for their values, you will need to mount them beneath the board axials will be just as cumbersome and harder to mount so stick with the boxes a better compromise would be the WIMA MKS4 caps i imagine they would almost slot straight in with some tricky leg bending and are by most reports good sounding for their price/size
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Nigel
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Post by Nigel on Mar 22, 2007 11:01:01 GMT
Hi dc,
If you send an email via the site link it doesn't work but it works fine if you copy & paste your link. Thanks for your help, your description of its sound made me want one straight away. I've had an email returned from the guy, < Hi! Metal can is better than ceramic ic and ceramic is better than the plastic one. They are not different at packing but different at spec. Dy-2000 metal can $32.9USD each Dy-2000 ceramic $13 USD Metal can is lot better for sure. It will be free ship to you by double registered air letter. It is a dula OPA and ad-823 is dual can be replace. Wu. >
I know it's bad form posting private emails but there's nothing that could upset anyone there. It could assist anyone who's thinking of getting op amps from the company though so I don't think Mr Wu will mind.
I've been following what people have been saying about op amps & the Heed & am starting to agree with Pink Floyd's initial assessment & your own conclusions.
The AD823 is the best at playing music, better than the OPA627BP's, which in turn are better than the LM4562. With the Chiarra, I like the LM4562 best though. I'll probably change my opinions next week. :-)
If your correct & the DY2000 does everything the AD823 does & then some it should be fantastic!
Nigel
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Post by PinkFloyd on Mar 22, 2007 11:52:37 GMT
Nigel, You could always try AD-744 biased into class A on a browndog, I have a module ready made up with 744 biased into class A on said browndog. You could also try OPA2107, AD8620 (I have these on browndogs ready to roll) in fact there are plenty you can try
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Nigel
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Post by Nigel on Mar 22, 2007 14:25:18 GMT
Yes, there's plenty to choose from.
I've ordered a DY2000 this morning.
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Post by dc on Mar 22, 2007 22:43:00 GMT
where do y'all buy opamps from? all the opamps i have are either salvaged or given free also nigel: will be interested to hear your impressions, if the metal version of the DY2000 is an improvement over the ceramic rather than a whole different OpAmp i will be on to it quick smart atm my canamp is in care of "spukee" who will be taking it to the sydney meet in my absence. hopefully we can see once and for all whether the mods were in vain
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Post by PinkFloyd on Mar 22, 2007 23:09:59 GMT
Both TI and AD have a very good samples program, if you want to evaluate their opamps then sign up with them and you can order free samples. Don't abuse the program though. You can no longer get free samples of OPA627 / OPA2604 thanks to Greedy bastards / crooks who abused the service and sold the free samples on ebay.... Order a few free samples and evaluate them....post your impressions, that's what it's all about....
Mike.
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Post by dc on Mar 23, 2007 0:11:24 GMT
thanks pinky, never realised that.
just took advantage of national's one for the LM4652s.
didn't know they all did the same
which leads me to my next question, where to get browndog adaptors that ship to australia?!!?
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Post by PinkFloyd on Mar 23, 2007 0:21:45 GMT
where to get browndog adaptors that ship to australia?!!? Youl'll get them from Warren Young (Tangent) tangentsoft.net/shop/ Very very good service indeed.
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Post by PinkFloyd on Mar 23, 2007 0:26:07 GMT
just took advantage of national's one for the LM4652s. Nationals sample program is CRAP, they charge you postage, Both TI and AD are totally free and deliver the samples within 3 days wherever you are on the globe (free samples / free express global delivery) I really may delete this post in the morning <keep your big mouth shut Pinko!>
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Post by dc on Mar 23, 2007 5:15:55 GMT
hehe that's funny, i didn't even have to pay for shipping on my LM4652s
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Post by yrh0413 on Mar 23, 2007 12:28:25 GMT
just curious, is it LM4652 or LM4562?
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Post by PinkFloyd on Mar 23, 2007 12:51:48 GMT
just curious, is it LM4652 or LM4562? LM4562
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Nigel
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Post by Nigel on Mar 23, 2007 14:49:56 GMT
dc,
Hi, I only ordered the ceramic op amp. Even though it will fit in place of the AD823, I had reservations about whether it would fit inside the socket.
Cheers,
Nigel
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