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Post by PinkFloyd on Aug 23, 2011 19:41:14 GMT
By the way..... will also be incorporating a few axial ferrite links at strategic points  |
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Post by Deleted on Aug 23, 2011 20:03:22 GMT
1uF will give a -3dB point of 1.6Hz in the Sunrise (-3dB).
On 10 Ohm setting with a 32 Ohm headphone it will be down 6dB around 1.6Hz.
On 68 Ohm setting with a 32 Ohm headphone it will be down 4dB around 1.6Hz.
So -0.5dB it will be around 10Hz.
ofcoarse when you up the capacitance the -3dB point will go lower but not so much on 10Ohm setting with32 Ohm headphones.
You can put in whatever value you like as long as it is at least 470nF IMO.
Bypassing it takes it out of the equasion but unfortunately requires re-adjustment so you can't simply yank the link out and see how it affects the sound as the sound will change because of the difference in bias.
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Post by Deleted on Aug 23, 2011 20:51:04 GMT
Thanks Mike.
This is a 'dep' job so there's no pressure and it's a quick hop to France. Sick keyboard player needed replacing by someone who knows the old repertoire as well as try the new stuff live. So they're stuck with me and my demands for absolute privacy. ;-) (especially for the family)
Also doing revision ideas for final recordings and looking at making them playable in 'live' situations. The French wouldn't know the beginning from the end so we're ok and we're able to 'test' revisions with small live audiences quietly.
Thanks for all the work on my amp. Especially getting it to quieten down electrically for me. I'm a booger for noise and it still amazes me how silent you got the V2 to be. It's a pain when you can't replicate the same problems yourself when you're putting it together.
A lot of it is my tendency to focus on hiss or buzz. It's normally the first thing I notice if it's there with all amps.
This is where I'm very lucky in that you seem to hear in a similar way to myself so I'm sure if it sounds good to your ears, it will to mine as well.
Maybe you can get it sounding Cadbury's nutcrunch with a touch of carame?
Ian
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Post by PinkFloyd on Aug 23, 2011 21:28:01 GMT
1uF will give a -3dB point of 1.6Hz in the Sunrise (-3dB). On 10 Ohm setting with a 32 Ohm headphone it will be down 6dB around 1.6Hz. On 68 Ohm setting with a 32 Ohm headphone it will be down 4dB around 1.6Hz. So -0.5dB it will be around 10Hz. ofcoarse when you up the capacitance the -3dB point will go lower but not so much on 10Ohm setting with32 Ohm headphones. You can put in whatever value you like as long as it is at least 470nF IMO. Bypassing it takes it out of the equasion but unfortunately requires re-adjustment so you can't simply yank the link out and see how it affects the sound as the sound will change because of the difference in bias. I appreciate that Frans... I had no intention of "Yanking" anything out  I'm going to "add" a bit of capacitance to make it sound better I am not "asking" you for guidance mate, I am simply showing you some respect here..... the stock "Sunrise" rocks BUT........ it can also Breakdance if you tweak it |
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Post by PinkFloyd on Aug 24, 2011 20:18:05 GMT
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Post by PinkFloyd on Aug 24, 2011 20:33:15 GMT
By the way.... she fired up first time.... all pics taken out in the workshop.... this is the best kit amp I have EVER built, solid as a rock / bullet proof design.... the SQ just blows most commercially made amps into the dust..... I'll repeat it again, this is a true gem.
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Post by Deleted on Aug 24, 2011 21:20:05 GMT
It looks pretty rugged with that black board, Mike. It's interesting seeing the two next to each other. There are some minor changes I think I can see on my phone. (!)
It makes sense to shield the valve as a precaution against stray rf. If it can't pick your phone up when it's virtually on it then it has to be doing a bloody good job!! I can normally break through most amps with a phone!!!
Let's face it - an amp needs to amplify the signal and reject as much noise as possible in any case. I would have thought that to be the basis of any amp. After that, any noise heard has to be coming from the amp itself.
Funny thing about the V2 was a tech guy at work was saying how I was wasting my time with tubes and their inherent noise and distortion so I took it in to him. I asked him whether he could 'hear' any noise or distortion.
After listening, he wanted to open it up!! Of course I said 'no' but he was really surprised how quiet it was. He thought I had something else under the bonnet.
He went on to say that measurements would show ....... Blah de blah. Them I got the lecture on odd and even harmonics/roll offs/limitations of power supplies in such designs - everything except one thing (in common with most people in this area) - the music!!!
He admitted that it did in fact 'sound' good. ;-)
Well, that helmet should reduce stray rf getting in and if you're putting another set of heat sinks on, it'll run cooler, so less damage in the long term. I'll probably stick a wire cage over it!
Looks don't worry me too much either if I'm honest. The lights have always puzzled me with all of the open designs. A piece of bling - I suppose it tells you that you've left it on. It also attracts buyers I guess 'cos it's pretty. Personally, I prefer something less obvious on the front but I suppose it's a bit of 'fun'.
The dynamics of your 'green' board really surprised me. First of all, I'd misjudged the power supply and thought it wasn't as powerful as it was.
It was quite weird to hear those enormous dynamics coming from it, thinking that I must be imagining it. I was quite relieved when you told me what it was because I was starting to think I was having a big placebo. In fact, the DT990's felt like they were hovering on my head. Going back to the V8 was slightly 'humbling'! It felt a bit thin by comparison. There's no doubt that it has a lot of slam and bass weight so I have no idea how it could give any more.
Actually, it's you that's got me into proper power supplies. I've become a supply freak. Once you hear that dynamic range available from gear at this price level, it does make you wonder about expensive stuff.
Mike, put in whichever valve you feel is best. We both have same headphones and similar tastes in sound sig so I'm certain that it'll suit me.
It's looking really fine. Quite industrial in black. Can't wait to hear it.
Ian
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mrarroyo
Been here a while! 
Our man in Miami!
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Post by mrarroyo on Aug 24, 2011 23:26:10 GMT
That is a really horrible job and I can not let Ian have such a bad looking amp. So I will sacrifice myself and take over it! Just kidding of course, great work as usual Mike. |
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Post by Deleted on Aug 25, 2011 6:44:54 GMT
You know you want one one Miguel. Say it 100 times - it makes me think of a V2 with no clothes on.
Ian
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Post by PinkFloyd on Aug 25, 2011 6:51:40 GMT
You know you want one one Miguel. Say it 100 times - it makes me think of a V2 with no clothes on. Ian Very manly too with the alu phallus sticking out the top |
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XTRProf
Fully Modded
Pssst ! Got any spare capacitors ?
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Post by XTRProf on Aug 25, 2011 9:09:09 GMT
That is a really horrible job and I can not let Ian have such a bad looking amp. So I will sacrifice myself and take over it! Just kidding of course, great work as usual Mike. So Miguel, how's yours coming along? You have ordered one? |
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mrarroyo
Been here a while!
Our man in Miami!
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Post by mrarroyo on Aug 25, 2011 10:42:58 GMT
No I have not ordered one, money is a bit tight. Tried to sell some items on HF and no bites. Oh well!
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Post by Deleted on Aug 25, 2011 10:53:48 GMT
They're really good, you know.........
;-)
Ian
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Post by PinkFloyd on Aug 25, 2011 11:22:23 GMT
I will burn her in tonight Ian... Just had another tooth removed and have to wait until December to get my new teeth fitted, this is positively Dickensian!!
My principles may soon go out the window and I'll be forced to go private... Either that or I'll have to make my own teeth. 2011 and it takes 4 months to get teeth made? I am also considering an Eastern European "dental" holiday... You basically go over for a couple of weeks (with no teeth) and fly back home looking like Donny Osmond... I'm going to do some enquiring and see if they have a teeth and bride package.... Nice set of teeth AND a young Eastern European bride ;-)
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Post by Deleted on Aug 25, 2011 11:43:35 GMT
You've had a helluva time with your teeth, Mike.
I couldn't believe how many came out last time with no warning and you went home on a bus!!
It's barbaric!!! Sounds like a good idea going abroad for teeth and brides. You could come home sore at both ends.
Both in one whammy would be nice!! Something to take your mind off the pain and not able to answer back? :-0
Only 4 essential phrases needed; 'yes', 'now', 'thank you', 'same again please'.
Sounds like a good break to me and you come back with a big toothy grin on your face.
Have you put the two amps together to compare, Mike. I'm wondering if you hear any differences? What with caps and a condom over the tube.
It sounds as though the dynamics may have increased from your earlier post.
Ian
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Post by whiteghost on Aug 26, 2011 21:33:23 GMT
Hello Rabbit, what kind of noise did you experienced with the sunrise ?
It was a slight kind of permanent "pschhhhhhhhh" only noticeable at low volume?
thanks
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Post by Deleted on Aug 26, 2011 22:08:45 GMT
No, I was getting electrical noise but it was only audible at about 1 or 2 'o clock. To me it sounded like mains noise and moving it to another room reduced it.
Mike has just put another one together for me and he's rather good at plugging these things up, so when I hear it, I'll write up what I'm getting.
If you have a permanent 'shooosh' sound going on, it sounds to me like you have low impedance headphones. Sometimes switching to something with a bit more resistance can completely knock that on the head.
Ian
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Post by whiteghost on Aug 26, 2011 23:05:45 GMT
it was a test with low-end AKG K77 (32 Ohms / Sensitivity 115 dB/V) output set at 10 Ohm on the Sunrise...
but i'll use the Sunrise with an AKG K601, heavily modded K340 and in the future : Beyerdynamic T70, perhaps a Grado or an Audèze LCD-2...
what is the best impedance setting for my cans ?
10 or 62?
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Post by Deleted on Aug 27, 2011 6:32:28 GMT
With the K601, the higher setting. They're designed to sound right from 120 ohms out. Hopefully, it'll make them less toppy.
Do you get the noise with the AKG?
It could be that 32 ohms is starting to get a little bit low for it. Although I've seen adverts for amps saying 32 to 600 ohms, they don't add 'quietly' to that claim!! 32 could show up some noise.
Ian
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Post by whiteghost on Aug 27, 2011 9:35:17 GMT
I'll try i don't have the Sunrise here for the moment, i'll tell you about the results of my tests in a while... thanks
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Post by whiteghost on Aug 27, 2011 16:15:31 GMT
i don't have the Sunrise at this moment, i will answer you in a while (two weeks)...
very long for me...
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Post by whiteghost on Sept 2, 2011 20:16:50 GMT
just tried my sunrise with k340 and k601:
-no noticeable noise, sound great but the radiators are damn hot (you can't touch it or you'll burn your fingers), i think this can damage the amp or shorten its lifetime... i'm right?
-volume must be set to max with the k340 and at 50% wirh the k601, thought it were more powerful.. perhaps it's my source? (cube c60 MP3 pllayer volume set at 40/40
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Post by Garage1217 on Sept 3, 2011 0:51:31 GMT
Hello, - Yes, they get very hot to the touch as outlined in the manual. Standard operational temp is 60-70C which is actually not hot at all for electronics, just hot to human flesh and the reason I designed the chassis around the heatsinks as guards. For example, max operational temp is around double the temp they are run at. I am VERY confident in the design which is why I slapped a 2 year warranty on the g1217 built units and have no doubt a properly built kit will stand the test of time. Will have no heat related issues so no worries. I personally think she sounds her best when she is nice and toasty  - Sounds like your source. With all of my sources, I generally keep the volume on sunrise around 11o'clock and turn the source up. Around 10-12 o'clock is the sweet spot measurement wise on the amp and giving it more source voltage keeps the signal clean as well to a certain point and IMO only, sounds more dynamic. And give her a GOOD quality source rather than a portable mp3 player and give her a listen if you have a good source. Sunrise really brings out differences in sources. To note: Sunrise now ships stock with a Russian 6N23P, newer chrome pin style built at the reflector plant. But for the cream of the crop, pick up a matched vintage - nos 6n23p from Mike, you will NOT be sorry you did. Outstanding valves. |
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Post by whiteghost on Sept 3, 2011 6:18:40 GMT
thanks for your explanations, my main worry was about the heat, now i'm not worried anymore.
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Post by whiteghost on Sept 3, 2011 11:03:37 GMT
Hey mike, i think you'll have few order of your "Project Sunrise" from france |
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I'm going to "add" a bit of capacitance to make it sound better 
