Jeg har kjøpt denne ferdig bygget (inkl rør oppgradering) av Cobra2. Den låter sinnsykt bra, men har det kjente støyproblemet i 50 - 60Hz området. Det er masse oppskrifter på nett om hvordan du blir kvitt denne støyen. Derrav det viktigste er å bygge den inn i et metal chassi da den fanger opp vel mye støy fra omgivelsene.
Pga. flytting, blir det ikke kapasitet for flere prosjekter her i gården. Håper derfor noen andre her kan ta opp tråden, og få gitt denne det livet den fortjener.
Litt info her:
http://www.vinylengine.com/turntable_forum/viewtopic.php?f=19&t=64786&start=60
http://www.audiokarma.org/forums/showthread.php?t=550392&highlight=bear&page=8
http://www.audiokarma.org/forums/showthread.php?t=550392&page=22
http://www.ebay.com/itm/Little-Bear...reamp-preamplifier-amplifier-uk-/301247275718
Leveres med skjema. Frakt 150,-
And about some buyer respond the hum noise problem.
In normal,there is some low humming noise.not loud.(because the phono preamp is amplifier the signal to about 800-1000 times,the MM source signal voltage is 10~20mV,MC source is 3~5mV,need amplifier up to 1.2~2V,(so,if any noise in the signal,it's will be same loud too.)
you can try follow step to be sure is in lowest.
1,Must be sure the the GND point is connect to real earth.you can test it.using your finger touch the GND point. is the humming noise come to lower?if yes.that's mean the GND cable not in good connect,if the humming noise is same,no change lower.that's good.
2,Using some better audio connect cable,and move this valve preamplifier little far from power or TV or other Electric device.
3,Connect the transformer case box to GND too.
(som beskrevet over her, forsvinner hum når du tar på jordkabelen)
Q: Some buyers ask me : why not build a metal box for this phono preamp?
A: If using a metal box, the price will increase to 280+USD, so many country's HiFi Fans cannot use it, because by using metal box, the amplifier would weigth more than 3KG, then we can not sent it by normail registered mail.(registered mail accepts packages weighing less than 2KG only).
bilder av faktisk riaa på finn.
Kan bringes Stavanger - Kristiansand.
Pga. flytting, blir det ikke kapasitet for flere prosjekter her i gården. Håper derfor noen andre her kan ta opp tråden, og få gitt denne det livet den fortjener.
Litt info her:
http://www.vinylengine.com/turntable_forum/viewtopic.php?f=19&t=64786&start=60
http://www.audiokarma.org/forums/showthread.php?t=550392&highlight=bear&page=8
http://www.audiokarma.org/forums/showthread.php?t=550392&page=22
http://www.ebay.com/itm/Little-Bear...reamp-preamplifier-amplifier-uk-/301247275718
Leveres med skjema. Frakt 150,-
And about some buyer respond the hum noise problem.
In normal,there is some low humming noise.not loud.(because the phono preamp is amplifier the signal to about 800-1000 times,the MM source signal voltage is 10~20mV,MC source is 3~5mV,need amplifier up to 1.2~2V,(so,if any noise in the signal,it's will be same loud too.)
you can try follow step to be sure is in lowest.
1,Must be sure the the GND point is connect to real earth.you can test it.using your finger touch the GND point. is the humming noise come to lower?if yes.that's mean the GND cable not in good connect,if the humming noise is same,no change lower.that's good.
2,Using some better audio connect cable,and move this valve preamplifier little far from power or TV or other Electric device.
3,Connect the transformer case box to GND too.
(som beskrevet over her, forsvinner hum når du tar på jordkabelen)
Q: Some buyers ask me : why not build a metal box for this phono preamp?
A: If using a metal box, the price will increase to 280+USD, so many country's HiFi Fans cannot use it, because by using metal box, the amplifier would weigth more than 3KG, then we can not sent it by normail registered mail.(registered mail accepts packages weighing less than 2KG only).
bilder av faktisk riaa på finn.
Kan bringes Stavanger - Kristiansand.
