It's Nippon for the clones *I think* from Google translate anyway. Not sure if anyone narrowed down exactly what type 47 Labs use however. Would be interested to hear what DNV says.
For the clones, they use Nichicon HE. For original, NIPPON CHEMI-CON for coupling and Nippon LXY 2200UF 50V for suply.
Thanks for that - yes I recognise the top of the can vent markings now
Out of interest anyone know how the 47 Labs amp pcbs are earthed? From the pictures on that Thai website it looks like each individual pcb might be connected to chassis by a metal-oxide 3-ohm resistor? Hard to tell for sure...
An externally hosted image should be here but it was not working when we last tested it.
Maybe that 3r0 is from Signal Ground to Main Audio Ground.
There should not be a lone 3r0 between Main Audio Ground and Chassis. That would be potentially lethal.
There should not be a lone 3r0 between Main Audio Ground and Chassis. That would be potentially lethal.
Well that area of the Gaincard board the 3R is attached to roughly matches the ground plane area of Peter's boards. For dual mono setups Peter recommends a 10R resistor to chassis ground from a similar location on his boards (marked CHG), which is why I thought the 3R might be doing the same job here.
I presume the mains safety earth on Gaincard is inside the seperate psu.
I can't tell from the pictures if the amp boards on Gaincard are left floating from the chassis, or grounded...
Have to say even if I could afford Gaincard, I'd much rather go with one of Peter's far neater (and probably better sounding, and safer!) iterations.
John.
I presume the mains safety earth on Gaincard is inside the seperate psu.
I can't tell from the pictures if the amp boards on Gaincard are left floating from the chassis, or grounded...
Have to say even if I could afford Gaincard, I'd much rather go with one of Peter's far neater (and probably better sounding, and safer!) iterations.
John.
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Looks like the Gaincard zobel values are different to the recommended ones too:
Gaincard: 0.01uF / 10R
National datasheet: 0.1uF / 2R7
Has anyone tried different values and noted any changes in sound or performance?
John.
Gaincard: 0.01uF / 10R
National datasheet: 0.1uF / 2R7
Has anyone tried different values and noted any changes in sound or performance?
John.
The 47 gaincard has a separate PSU and the safety is there. It is not necessary to "ground" the amplifier unit as well it is essentially a low voltage unit unless it is connected to mains or telephone lines..
Nico, you are overlooking the small risk of a mains fault sending mains power down one of the low voltage lines connecting the mains powered unit to the low voltage unit.
I am happy to answer questions.
It may be time to compose in English.
do not gain card copy.
Can not gain clone that sounds like a gain card.
We made it just for illustrative purposes only.
47lab design is the ultimate for gaincard.
We show respect to Mr. Kimura of mind.
It may be time to compose in English.
do not gain card copy.
Can not gain clone that sounds like a gain card.
We made it just for illustrative purposes only.
47lab design is the ultimate for gaincard.
We show respect to Mr. Kimura of mind.
We did not do this for commercial projects.
But we want to find a gain card.
What are the variables that make up the audio gain card.
We already know the answer to those of the actual gain card to buy 3 sets.
I tried to gain card + 2 humtpy voice recognition can not find int amp 50 watt or more.The sound gaincard.
Of course, that's not the same sound. Sounds like the same.
I believe that if you gain card + 2 humpty.
Then listen to the audio to identify sufficient depth. You can get a magical experience on a truly gain card.
But we want to find a gain card.
What are the variables that make up the audio gain card.
We already know the answer to those of the actual gain card to buy 3 sets.
I tried to gain card + 2 humtpy voice recognition can not find int amp 50 watt or more.The sound gaincard.
Of course, that's not the same sound. Sounds like the same.
I believe that if you gain card + 2 humpty.
Then listen to the audio to identify sufficient depth. You can get a magical experience on a truly gain card.
Watch and listen to some
Sorry the sound quality is not very good.
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Sorry the sound quality is not very good.
§Ò¹µé͹ÃѺÊÁÒªÔ¡¨Ò¡ ¡·Á.áÅÐÃèÇÁ·´Êͺ¡Åèͧã¹â¤Ã§¡ÒÃ3875¤ÃѺ
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