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Post by PinkFloyd on Feb 15, 2008 22:12:34 GMT
The Mr. Doudou "Singer" headphone amp is on its way to the Grotto for an audition and full details will appear here as soon as she arrives. In the meantime here are a few pics: Frequency Response 5Hz-75KHz +/-0.1dB THD+N =<0.01% (A-weight) Signal-to-Noise Ratio >=98dB (A-weight) Gain 6.5x / 16dB Input Impedance 100K ohm Output Impedance less than 5 ohm Output Voltage 17.5Volts peak-to-peak @ 32ohm load Inputs 1 RCA input Outputs 1 1/4" headphone out Output Power 1 Watt Operating Voltage 100-120VAC (or 200-240VAC) Power Consumption 17.5 Watts Chassis Dimensions 184(W) x56 (H) x280 (L) mms Weight 1.95kg
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insomniac
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Post by insomniac on Feb 15, 2008 23:00:46 GMT
That's a tasty looking amp......I look forward to more details and price.
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Post by PinkFloyd on Feb 16, 2008 0:15:42 GMT
Looks very nice (based on the pictures). A few questions if I may: Sure, fire away Miguel....... Discrete - Class AB, Loop-free NFB To be decided shortly. Designed by Mr. Doudou and manufactured in mainland China in a very well equipped production facility. Yes, operating voltages available = 100-120VAC (or 200-240VAC) No probs Miguel, I'll try and get one over to you for evaluation. I'll also punt my sample around the UK circuit when I'm finished evaluating it.... I like the look of this guy, not an opamp in sight
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leo
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Post by leo on Feb 16, 2008 1:19:32 GMT
This looks an interesting amp! Looking forward to see the write up
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Post by PinkFloyd on Feb 16, 2008 1:37:48 GMT
This looks an interesting amp! Looking forward to see the write up Yup
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Post by dc on Feb 16, 2008 1:46:00 GMT
Is it just me or is it in uncanny resemblance maybe layout re-arranged
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leo
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Post by leo on Feb 16, 2008 3:40:27 GMT
Hmm, they do look similar don't they ;D I can't seem to see op-amp DC servo's on the Mr. Doudou "Singer" ,
We'll soon know if Mike posts any closer pics of the amp modules
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Post by dc on Feb 16, 2008 6:10:56 GMT
yes the servos are the first thing i noticed missing
the gilmore amps are also said to run in class-A so there's another difference
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Post by merton on Feb 16, 2008 6:41:07 GMT
is it pronounced doo doo?
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pagan
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Post by pagan on Feb 16, 2008 8:51:56 GMT
Hmm, they do look similar don't they ;D I can't seem to see op-amp DC servo's on the Mr. Doudou "Singer" , We'll soon know if Mike posts any closer pics of the amp modules Opamp between the 2 electro's next to blue poly. Besides that it does look similar!
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Post by dc on Feb 16, 2008 9:10:26 GMT
Opamp between the 2 electro's next to blue poly. Besides that it does look similar! looking for the opamp in the doudou!
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pagan
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Post by pagan on Feb 16, 2008 9:57:09 GMT
Opamp between the 2 electro's next to blue poly. Besides that it does look similar! looking for the opamp in the doudou! end of the pcb's, to the middle of the whole unit. two led's at input (near side wall), the Opposite end of pcb, one electro, opamp, blue poly cap another electro.
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Post by dc on Feb 16, 2008 10:15:35 GMT
you're talking about this picture? for the life of me i can't find it
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pagan
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Post by pagan on Feb 16, 2008 13:48:46 GMT
DC sorry got pic's mixed up
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Post by PinkFloyd on Feb 16, 2008 15:05:04 GMT
OK guys, have been speaking to Mr. Doudou and here's the lowdown..... DC servo opamps are under the boards and are 1 x OPA604 per channel. Caps are ELNA RSH and ELNA cerafine, pot is ALPS RK27, 1% .25W metal film resistors, transistors BC550/BC560 and TIP41C/42C, 20VA encapsulated transformer (encapsulated twin bobbin) price will be $400 (that includes worldwide shipping)
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Post by dc on Feb 16, 2008 16:03:08 GMT
DC servo opamps are under the boards heh so it IS a kevin gilmore dynalo
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Post by PinkFloyd on Feb 16, 2008 16:17:49 GMT
DC servo opamps are under the boards heh so it IS a kevin gilmore dynalo Loosely similar in appearance but apparantly the circuit is different.
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leo
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Post by leo on Feb 16, 2008 18:17:10 GMT
We can work the circuitry out by looking at the track layout so we'll see could be the same circuit but different bias setting? ;D
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Post by headtestament on Feb 17, 2008 2:03:40 GMT
Thanks PinkFloyd and other friends. Headtestament are a new team work on Headamp,DAC,Table Audio etc.We enjoy DIY many year, The 'Singer' is first product toword market of Headtestament. Before now,most one quenstion as DC and leo's,'Is't a GS-1?' , for this reason,we reciveed some interesting contrast for Singer and GS-1 from our friends,but we expectant more. We sent a pic of 'Gain board',you can see it's a circuit diffrent , you can't find any transistor as 2SK389/2Sj109,you can find diffrent number of transistors and two mica cap etc.. Thanks for you questions,thanks for you abide my poor English.
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leo
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Post by leo on Feb 17, 2008 2:35:22 GMT
Hello and welcome to Rockgrotto! Thank you for the pic, your amp looks interesting
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FritzS
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Post by FritzS on Feb 17, 2008 6:12:07 GMT
Thanks PinkFloyd and other friends. Headtestament are a new team work on Headamp,DAC,Table Audio etc.We enjoy DIY many year, The 'Singer' is first product toword market of Headtestament. Before now,most one quenstion as DC and leo's,'Is't a GS-1?' , for this reason,we reciveed some interesting contrast for Singer and GS-1 from our friends,but we expectant more. We sent a pic of 'Gain board',you can see it's a circuit diffrent , you can't find any transistor as 2SK389/2Sj109,you can find diffrent number of transistors and two mica cap etc.. Thanks for you questions,thanks for you abide my poor English. To compare the HeadAmp module
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FritzS
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Post by FritzS on Feb 17, 2008 6:21:15 GMT
Mike, is this the homepage of Mr. Doudou? www.headtestament.com/Now I think yes - I had overseen headtestament is in forum too. Welcome headtestament are you Mr. Doudou in person? From where you coming?
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Post by dc on Feb 17, 2008 8:59:22 GMT
interesting!
so has it been compared to the GS-1???
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Post by PinkFloyd on Feb 17, 2008 13:24:55 GMT
Yes, headtestament is Mr. Doudou and gets a very warm welcome to Rock Grotto. I am waiting for the Singer to arrive and will do a blow by blow as soon as she's here. Certainly looks capable of providing some serious sonics and it will be interesting to hear what she can deliver. Looks like this is going to be a very interesting thread Once again, welcome to Rock Grotto headtestament!
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Post by dc on Feb 17, 2008 13:45:00 GMT
and send it over the other pond to Australia for a review in every continent!
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