AS_ Audio asked if you shorted the input to prove it is the amp --did you ?
Just listening without shorting out the phono input isn't full proof of what or where the noise is coming from.
Just listening without shorting out the phono input isn't full proof of what or where the noise is coming from.
The line part does not make any noise if I put the head phono card and pulse on disks 1 or 2 MM or MC makes noise to turn up the volume
First : please correct your manual link, post 18.
We already knew that the line inputs are quiet.
Again : I do not understand your reply. This may
be a language problem and failure of automatic
translation. Please consider this when reading and
writing.
Noise may be what is called ruido in Spain ..
Phono inputs without turntable, volume
up and inputs shorted : hum or not ?
(I suppose that you know what shorted input
means, but not sure .. ).
Noise is not hum, but hum is sort of a noise.
This is why I asked for 50 or 100 Hz hum.
It appears that you are not able or not willing
to reply to precise questions which are aimed
at a systematic approach to troubleshooting.
Please let me know, otherwise help is not possible.
We already knew that the line inputs are quiet.
Again : I do not understand your reply. This may
be a language problem and failure of automatic
translation. Please consider this when reading and
writing.
Noise may be what is called ruido in Spain ..
Phono inputs without turntable, volume
up and inputs shorted : hum or not ?
(I suppose that you know what shorted input
means, but not sure .. ).
Noise is not hum, but hum is sort of a noise.
This is why I asked for 50 or 100 Hz hum.
It appears that you are not able or not willing
to reply to precise questions which are aimed
at a systematic approach to troubleshooting.
Please let me know, otherwise help is not possible.
Miguelnoda-- the phono input in any amplifier is usually the most sensitive , it therefore stands to reason that it can pick up external noise not just internal noise generated in the amplifier .
That is the reason AS_Audio asked you to ---Spanish-- cortocircuitado the phono INPUT , I am not a Spanish speaker only some French & German so I don't know if that is the right word .
Until you do that its hard to make progress with your fault.
That is the reason AS_Audio asked you to ---Spanish-- cortocircuitado the phono INPUT , I am not a Spanish speaker only some French & German so I don't know if that is the right word .
Until you do that its hard to make progress with your fault.
I think we have a big problem in translation or Miguel is just not willing to give any sort of reply to any advice given here .
Parley - vous francais Miguel ?
Parley - vous francais Miguel ?
This is a circuit board.
it is not sure your problem is original to this phono board.
Back to post 19 and 23.
it is not sure your problem is original to this phono board.
Back to post 19 and 23.
Finally solved the IC 4559D in bad condition of the upgrade plates.
I don't know if the 4559D could be changed for more current ones
I don't know if the 4559D could be changed for more current ones
4559DR (Texas Instruments ) is currently available as a direct replacement .
Of course you could "upgrade " it to some fancy audio IC but your circuit is designed for this unity gain BW of 3MHz upping this without any change in compensation --might work but there is a good chance of HF oscillation .
Of course you could "upgrade " it to some fancy audio IC but your circuit is designed for this unity gain BW of 3MHz upping this without any change in compensation --might work but there is a good chance of HF oscillation .
Can not believe that this was reason of the hum unless the IC was oscillating.
OP did not care to reply to simple questions so he was on his own.
OP did not care to reply to simple questions so he was on his own.