I greet you all,
I have a question about the construction of the output stages of the pass aleph 5 clone.
I use a power supply with two bridges and CLC filters with a capacity of 88000uF. Power supply Is on a toroidal transformer 2x30V 600VA
For a while, I struggled with the hum caused by the incorrect placement of the transformer and successfully solved it by rotating it to the correct position.
Now, however, I have another problem with hum in the moment when I connect both output stages to the preamplifier and in essence it is enough for me to connect the inputs both symmetrically and asymmetrically.
therefore, the hum starts at the moment when the positive input terminals of the output stage for the right and left channels are connected.
I tried to connect the GND of both inputs, but the hum will appear even when the inputs are shorted.
I have the input power of the primary forcing of the transformer separately with the help of the TNC and of course GND.
is there any solution to my problem?
thank you in advance for any advice.
1610005780357.jpg - Google Drive
1610005780380.jpg - Google Drive
1610005780388.jpg - Google Drive
1610005780391.jpg - Google Drive
1610005780402.jpg - Google Drive
https://drive.google.com/file/d/10vYsOHY9i2i-OsAqjht88KKQnPYYL-AE/view?usp=sharing
https://drive.google.com/file/d/1121doqSj1GaHM_tkg6Gs80Hgz5p6-IZd/view?usp=sharing
https://drive.google.com/file/d/117o1xMQw02PaNyZjNyXR5ZIavjNe6daZ/view?usp=sharing
https://drive.google.com/file/d/11RAR69_JDzdEcCnAACYFgyN2236tt2XP/view?usp=sharing
https://drive.google.com/file/d/11RAR69_JDzdEcCnAACYFgyN2236tt2XP/view?usp=sharing
https://drive.google.com/file/d/11WzVRzrtptcxd-FWlpD7rhNPHkO1jPvK/view?usp=sharing
https://drive.google.com/file/d/11a5bSiHUTNFPoPTq5bk9SCTjzBggHB5s/view?usp=sharing
https://drive.google.com/file/d/11aSKYn_XTJrC78UXDB0zmQuOz67iUByv/view?usp=sharing
https://drive.google.com/file/d/11aUGNpl56YljXd08Frf1lKu0Gx6hohEr/view?usp=sharing
https://drive.google.com/file/d/11fRhNXkBE8rjxPmwVaxpqMxc2d5RxOLS/view?usp=sharing
https://drive.google.com/file/d/11fdddruQNg1beMEERh7ogVXaoPGW3hFv/view?usp=sharing
https://drive.google.com/file/d/15IIjo_j8ND5ndM4OaI3IlZOGV60TmQ64/view?usp=sharing
https://drive.google.com/file/d/1WEooYrAXrgleBHWiVvZkJnl8ogBo1you/view?usp=sharing
power supply:
https://drive.google.com/file/d/1GZIBL2VQfpvZTxcFovs3YZZuu7OOExax/view?usp=sharing
I have a question about the construction of the output stages of the pass aleph 5 clone.
I use a power supply with two bridges and CLC filters with a capacity of 88000uF. Power supply Is on a toroidal transformer 2x30V 600VA
For a while, I struggled with the hum caused by the incorrect placement of the transformer and successfully solved it by rotating it to the correct position.
Now, however, I have another problem with hum in the moment when I connect both output stages to the preamplifier and in essence it is enough for me to connect the inputs both symmetrically and asymmetrically.
therefore, the hum starts at the moment when the positive input terminals of the output stage for the right and left channels are connected.
I tried to connect the GND of both inputs, but the hum will appear even when the inputs are shorted.
I have the input power of the primary forcing of the transformer separately with the help of the TNC and of course GND.
is there any solution to my problem?
thank you in advance for any advice.
1610005780357.jpg - Google Drive
1610005780380.jpg - Google Drive
1610005780388.jpg - Google Drive
1610005780391.jpg - Google Drive
1610005780402.jpg - Google Drive
https://drive.google.com/file/d/10vYsOHY9i2i-OsAqjht88KKQnPYYL-AE/view?usp=sharing
https://drive.google.com/file/d/1121doqSj1GaHM_tkg6Gs80Hgz5p6-IZd/view?usp=sharing
https://drive.google.com/file/d/117o1xMQw02PaNyZjNyXR5ZIavjNe6daZ/view?usp=sharing
https://drive.google.com/file/d/11RAR69_JDzdEcCnAACYFgyN2236tt2XP/view?usp=sharing
https://drive.google.com/file/d/11RAR69_JDzdEcCnAACYFgyN2236tt2XP/view?usp=sharing
https://drive.google.com/file/d/11WzVRzrtptcxd-FWlpD7rhNPHkO1jPvK/view?usp=sharing
https://drive.google.com/file/d/11a5bSiHUTNFPoPTq5bk9SCTjzBggHB5s/view?usp=sharing
https://drive.google.com/file/d/11aSKYn_XTJrC78UXDB0zmQuOz67iUByv/view?usp=sharing
https://drive.google.com/file/d/11aUGNpl56YljXd08Frf1lKu0Gx6hohEr/view?usp=sharing
https://drive.google.com/file/d/11fRhNXkBE8rjxPmwVaxpqMxc2d5RxOLS/view?usp=sharing
https://drive.google.com/file/d/11fdddruQNg1beMEERh7ogVXaoPGW3hFv/view?usp=sharing
https://drive.google.com/file/d/15IIjo_j8ND5ndM4OaI3IlZOGV60TmQ64/view?usp=sharing
https://drive.google.com/file/d/1WEooYrAXrgleBHWiVvZkJnl8ogBo1you/view?usp=sharing
power supply:
https://drive.google.com/file/d/1GZIBL2VQfpvZTxcFovs3YZZuu7OOExax/view?usp=sharing
Last edited:
Hello,
sending block diagram my setup - now i have amp disassembled
Hum is activated , when is RCA input points connecting together - posible for bi-amp/mono summed - that is my
requirement for amp.
BTW, if i connect to any preamp , situation is same - HUM.
If are connect only one block of amp, is nice silent and sounds is greats.
sending block diagram my setup - now i have amp disassembled
Hum is activated , when is RCA input points connecting together - posible for bi-amp/mono summed - that is my
requirement for amp.
BTW, if i connect to any preamp , situation is same - HUM.
If are connect only one block of amp, is nice silent and sounds is greats.
Attachments
I need the real picture to show the way you wiring your amp inside the chassis.
My guess, your problem seem to be cause from cross channel ground loop. Try to wiring the other way.
My guess, your problem seem to be cause from cross channel ground loop. Try to wiring the other way.
tie the grounds together off each channels capacitor bank, then through 1 NTC to chassis ground. Each channel shares a common transformer and bridge rectifiers, I believe they need to share the same ground to avoid ground loops.
Last edited:
Yes, of course,
JUST please také a moment-i waiting for new rectifier bridge And toroif.after that i post photo.
Thanks you
JUST please také a moment-i waiting for new rectifier bridge And toroif.after that i post photo.
Thanks you
Yes, i understsnd, unfortunately Now i hawe blow up rectifier And i have in order new toroid.next week i make post with photo
hello my issue loks like a cross chanel ground loop and electromagnetic hum from transformer. I must buy other two pcs and try new design of power supply.