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Old 22nd April 2008, 02:54 AM   #1
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Default Need help identify the diode

Hi guys, I am looking for replacement or upgrade of two diodes.

i was suggested to look for International Rectifier Hexfred Part #HFA08PB120 and #HFA08TA60C.

i found these on farnell. are they the same with the part no above?
http://sg.farnell.com/jsp/search/pro...sp?sku=1013358
http://sg.farnell.com/jsp/search/pro...sp?sku=1298419

the diode i am trying to replace look like the picture below. (not actual picture, but look the same)

as the pictures do not look the same? do they function the same or they suggested me to change the diodes?
Attached Images
File Type: jpg diodes2a.jpg (3.3 KB, 249 views)
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Old 22nd April 2008, 05:56 AM   #2
oshifis is offline oshifis  Hungary
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Hi,

Could you read exactly how is the original marked? I can read only 1N from the picture. Most diodes are marked with 1N....
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Old 22nd April 2008, 06:14 AM   #3
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thats not the actual picture, but i only have value for one of them. its 1N4007. i do not have the other one. part# above doesnt tell anything? thanks
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Old 24th April 2008, 04:47 AM   #4
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1N4007 Rectifier Diode suggested upgrade With International Rectifier Hexfred Part #HFA08PB120
and

1N4002 suggested upgrade with International Rectifier Hexfred Part #HFA08TA60C

will the suggested upgrade perform better function? as they both do not look the same. THX
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Old 24th April 2008, 07:17 AM   #5
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Default amc cvt 1030 schematic

need help on suggested improvement on capacitor or diode. schematic are attached. thanks in advance
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File Type: jpg 1030schematic.jpg (79.1 KB, 224 views)
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Old 24th April 2008, 12:08 PM   #6
lineup is offline lineup  Sweden
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Default AMC CVT-1030 schematic headphone amplifier

Quote:
Originally posted by milen007
need help on suggested improvement on capacitor or diode.
schematic are attached.
Depending how old this amplifier is, it can be a good idea
to replace all electrolytic capacitors.
Such Caps have liquid inside and so Dry Out year by year.


Other, solid and plastic capacitors do not age.
But if your amplifier is very old, a change to modern types might be an idea.
The improvement, in this case,
might be anything from no improvment to some little improvement.

--------------------------------------------------------------------------------------

See my AMC CVT 1030 headphone amp shematic attachment.


CVT 1030 has got a NE5532 Op-Amp based headphone amp.
For a cheap and easy upgrade of this headphone amplifier
I recommend this:

1. Replace Op-Amp with OPA2134.
In this case are no problems without any circuit modifications.

2. Replace those polarized 5 capacitors.
They have values 10uF and 22uF


Regards
lineup
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File Type: png amc_cvt-1030_headph-amp.png (32.3 KB, 176 views)
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Old 24th April 2008, 12:21 PM   #7
oshifis is offline oshifis  Hungary
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Location: Budapest, Hungary
My experience is that fast rectifiers in the power supply generally produce better sound. I never tried Hexfreds, just Schottkys. But rectifiers are not the only factor determining the sound. Other passive components like electrolytic capacitors are also important.
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Old 24th April 2008, 02:33 PM   #8
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thanks, another pic of the actual inside of the amp. my friend suggest me changing the orange colour caps. what do you guys think??
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File Type: jpg amc1030.jpg (27.6 KB, 181 views)
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Old 24th April 2008, 02:37 PM   #9
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Default Re: AMC CVT-1030 schematic headphone amplifier

Hi Lineup

changing op-amp dont change the overall sound right? only for headphone?

do you mod your 1030? mind sharing? thx

regards,
milen

Quote:
Originally posted by lineup


Depending how old this amplifier is, it can be a good idea
to replace all electrolytic capacitors.
Such Caps have liquid inside and so Dry Out year by year.


Other, solid and plastic capacitors do not age.
But if your amplifier is very old, a change to modern types might be an idea.
The improvement, in this case,
might be anything from no improvment to some little improvement.

--------------------------------------------------------------------------------------

See my AMC CVT 1030 headphone amp shematic attachment.


CVT 1030 has got a NE5532 Op-Amp based headphone amp.
For a cheap and easy upgrade of this headphone amplifier
I recommend this:

1. Replace Op-Amp with OPA2134.
In this case are no problems without any circuit modifications.

2. Replace those polarized 5 capacitors.
They have values 10uF and 22uF


Regards
lineup
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Old 28th April 2008, 03:40 PM   #10
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nt
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