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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
11-11-2008, 01:37 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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The unit would not turn on if that setting was incorrect, Georgia is 220V, if the voltage setting was to be incorrect (110V) the unit would have blown a couple of caps already, no lights, that's not the problem, do not touch that setting!
EDIT
sandchak got it first 
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
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11-11-2008, 02:51 PM
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500+ Head-Fi'er
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Join Date: Jul 2008
Location: Hull, UK
Posts: 822
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Just for info : RE Buzzing Transformer in UK.
I tried a step transformer 240 - 110 V, and then selected 110v on the amp, and all the transformer noise has gone, quiet as a mouse.
Guess I'll look for a new transformer thats not going to buzz in the UK, better than a big lump tha I've then got to hide.
Cheers
__________________
Home : SqueezeCenter 7.3 -> Squeezebox3 -> Audio-Gd DAC-3SE -> Audiotailor Jade -> HD 650/Grado HF-2
Away : Ipod 160GB/Vaio Laptop -> LOD/USB -> IBasso D3 -> ER-6i/DT 770
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11-11-2008, 04:13 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,266
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Quote:
Originally Posted by sandchak
checked - its on 220 ( which is correct..)
Thank you
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Does the headphone sound work well? Can you get high volume without distortion?
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11-11-2008, 06:49 PM
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500+ Head-Fi'er
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Join Date: Jul 2008
Location: Hull, UK
Posts: 822
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Quote:
Originally Posted by BigTony
Just for info : RE Buzzing Transformer in UK.
I tried a step transformer 240 - 110 V, and then selected 110v on the amp, and all the transformer noise has gone, quiet as a mouse.
Guess I'll look for a new transformer thats not going to buzz in the UK, better than a big lump tha I've then got to hide.
Cheers
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Grrr, spoke too soon :-( It was quiet for about 4 hours, but now its back to buzzin.. I'm guessing that all isn't well with this transformer.
Bugger.
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Home : SqueezeCenter 7.3 -> Squeezebox3 -> Audio-Gd DAC-3SE -> Audiotailor Jade -> HD 650/Grado HF-2
Away : Ipod 160GB/Vaio Laptop -> LOD/USB -> IBasso D3 -> ER-6i/DT 770
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11-11-2008, 07:50 PM
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Head-Fi'er
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Join Date: Jul 2008
Posts: 55
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Quote:
Originally Posted by BigTony
Grrr, spoke too soon :-( It was quiet for about 4 hours, but now its back to buzzin.. I'm guessing that all isn't well with this transformer.
Bugger.
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Harmonics from a dirty power line may cause transformer to hum as well. Try another power bar or outlet if you can. Keep distance from high power appliances, such as oven and refrigerator. Just my two cents.
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11-11-2008, 09:45 PM
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500+ Head-Fi'er
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Join Date: Jul 2008
Location: Hull, UK
Posts: 822
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It hums no matter where it gets plugged in, it starts off quiet then over 4+ hours it gets louder.
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Home : SqueezeCenter 7.3 -> Squeezebox3 -> Audio-Gd DAC-3SE -> Audiotailor Jade -> HD 650/Grado HF-2
Away : Ipod 160GB/Vaio Laptop -> LOD/USB -> IBasso D3 -> ER-6i/DT 770
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11-12-2008, 04:37 AM
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500+ Head-Fi'er
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Join Date: Oct 2008
Location: Tbilisi - Georgia
Posts: 937
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Quote:
Originally Posted by les_garten
Does the headphone sound work well? Can you get high volume without distortion?
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Works absolutely fine, yes it does seem to distort at very high volume, but the the 701s that I have is barely 5 days old and still in the process of burning..
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11-12-2008, 10:24 AM
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Headphoneus Supremus
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Join Date: Feb 2008
Location: GreaterTorontoArea in Sub-Urbaine hell
Posts: 3,113
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Quote:
Originally Posted by sandchak
Works absolutely fine, yes it does seem to distort at very high volume, but the the 701s that I have is barely 5 days old and still in the process of burning..
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I may have spotted something in one of the pics you posted. There are 4 x 47uf 10V coupling caps (Elna Silmic) near the 2 voltage regulators on the lower right hand corner of the main pcb (if the front faceplate is towards you as normal).
I can't tell for sure but it looks like one or all of those caps are not installed correctly according to their polarity. The shaded side silk screening on the pcb itself denotes - or negative pole. All electrolytic caps will have a negative indicator stripe (can't miss it ). Check the whole main board to make sure all the electrolytic caps are installed correctly just to be safe.
Someone else of late had one those coupling caps installed incorrectly by the factory although he was still getting sound but at reduced output to that channel (it was one of four in backwards).
Hopefully that's the ticket.
Peete.
__________________
Cans :HD650, AKG 240M (HD650 DIY cables SE and Balanced)
Desktop amps : LD MK III (6H30P-i DR's + DIY mods, Jaycar DIY kit amp (major DIY mods), 2 X Audio-gd Compass (test prototype,final version), Audio-gd C-2C W/ Stepped pot Upgrade, Audio-gd Phoenix SS balanced preamp/headamp.
Transports: Auzen Prelude PCI 7.1 SC/ASIO native driver using Media Monkey (all EAC ripped FLAC/Wav), Vanguard CDM12 Pro (BNC mod), HK HD720 (completely upgraded), Audio-gd CD7 Transport.
Sources: FrankenDAC DIY 24/192 dac (HDAMs/Teflon/PIO cap mod), Compass DAC, See Corp Vintage UK TT(Mission arm/Ortofon OM20S MM cart), Yaqin MS12B tube phono preamp, TEAC V530X Tape deck, Audio-gd Reference 1 DAC. C2C DIY pot mod http://www.head-fi.org/forums/f6/ste...1/#post5846722
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11-12-2008, 10:36 AM
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500+ Head-Fi'er
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Join Date: Oct 2008
Location: Tbilisi - Georgia
Posts: 937
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Quote:
Originally Posted by Pricklely Peete
I may have spotted something in one of the pics you posted. There are 4 x 47uf 10V coupling caps (Elna Silmic) near the 2 voltage regulators on the lower right hand corner of the main pcb (if the front faceplate is towards you as normal).
I can't tell for sure but it looks like one or all of those caps are not installed correctly according to their polarity. The shaded side silk screening on the pcb itself denotes - or negative pole. All electrolytic caps will have a negative indicator stripe (can't miss it ). Check the whole main board to make sure all the electrolytic caps are installed correctly just to be safe.
Someone else of late had one those coupling caps installed incorrectly by the factory although he was still getting sound but at reduced output to that channel (it was one of four in backwards).
Hopefully that's the ticket.
Peete.
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Thanks million, Peete, I will surely check on that.. in the meantime I have received 3 X LM4562NA opamps, can I replace that with the current 627 and see if its the opamp which maybe the culprit???...
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11-12-2008, 10:09 PM
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500+ Head-Fi'er
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Join Date: Jun 2008
Location: United State of Britainland
Posts: 639
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Quote:
Originally Posted by BigTony
Grrr, spoke too soon :-( It was quiet for about 4 hours, but now its back to buzzin.. I'm guessing that all isn't well with this transformer.
Bugger.
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I ordered a DAC from Lawrence a few months back, which turned out to be faulty(think I might have been the first on here to get stung by him, he ignored me completely and I ended up instigating a chargeback against PayPal for the amount via my bank).
Anyway, the DAC PCB was the cause of the fault. My recollection is that there was no hum from the transformer, but it was several months ago now.
I've still got it here, you can have it for the cost of post and a pint of Guinness if you want?
~Phewl.
__________________
Senn 480II-13R cans, overshadowed by...
Black Stax SRS-4040II rig - awesome! Loving it! Certainly worth most of the extortionate amount of pennies it cost. ;-)
Compass DAC by Audio-GD - very, very nicely made with a lovely sound. First UK owner?
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11-13-2008, 04:28 AM
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Head-Fi'er
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Join Date: Sep 2008
Posts: 84
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This has probably been asked several times before and I just can't find the posts...
Payday is Friday and I plan on making a purchase (hopefully, provided I don't chicken out). Is the shenzhen Audio store/wsz0304 a good, reliable source for Zero DACs? He sells the upgraded version with the OPA627 opamp (it doesn't mention what's on the headphone section though):
ZERO 24/192 DAC DA CONVERTOR, HEAD AMP(Upgrade Version) - eBay (item 110287180536 end time Dec-06-08 13:00:00 PST)
He has 100% good feedback which looks like a good sign.
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11-13-2008, 04:34 AM
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Head-Fi'er
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Join Date: Jul 2006
Location: Somewhere over the Rainbow
Posts: 67
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wsz0304 is who I purchased mine from and am pretty sure he is owner or at least partial owner of little dot. He was very helpful in my purchase of the I+ and ZERO combo.
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11-13-2008, 04:57 AM
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500+ Head-Fi'er
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Join Date: Oct 2008
Location: Tbilisi - Georgia
Posts: 937
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Quote:
Originally Posted by crzystng
wsz0304 is who I purchased mine from and am pretty sure he is owner or at least partial owner of little dot. He was very helpful in my purchase of the I+ and ZERO combo.
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I second that, although my amp came in defective, he is a really nice guy and he is trying to help me out too just like people on the forum specially Peete, to get the Zero up and running..
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11-13-2008, 07:31 AM
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Junior Head-Fi'er
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Join Date: Aug 2008
Posts: 14
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Cap snipping mod
Hi there guys!
Have someone of you tried the "cap snipping mod" cutting off those capacitors in the Dac and Pre-amp sections?
I'd like to do it but i fear bad consequences, like sound becoming TOO bright for my ears.... anyone giving me some advice?
Thanks
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11-13-2008, 07:49 AM
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500+ Head-Fi'er
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Join Date: Jul 2008
Location: Hull, UK
Posts: 822
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Quote:
Originally Posted by AudioPhewl
I ordered a DAC from Lawrence a few months back, which turned out to be faulty(think I might have been the first on here to get stung by him, he ignored me completely and I ended up instigating a chargeback against PayPal for the amount via my bank).
Anyway, the DAC PCB was the cause of the fault. My recollection is that there was no hum from the transformer, but it was several months ago now.
I've still got it here, you can have it for the cost of post and a pint of Guinness if you want?
~Phewl. |
Many many thanks, pm sent!! Buzzin is driving me (and therefore my family crazy)!
Anyone else remove the batteries from clocks in their listening room due to the infernal ticking!! or is that just me?
__________________
Home : SqueezeCenter 7.3 -> Squeezebox3 -> Audio-Gd DAC-3SE -> Audiotailor Jade -> HD 650/Grado HF-2
Away : Ipod 160GB/Vaio Laptop -> LOD/USB -> IBasso D3 -> ER-6i/DT 770
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