cortico
Active Member
Hi guys,
My friend asked me to take a look at his receiver, he complained about having distortion and low volume on the right channel on a otherwise super clean and good looking receiver.
Besides the bad channel there is a momentary hum when amp is powered up, it seems like a power supply cap charging up. There is some cap sleeve shrinking on Power supply (C807, C805).
After troubleshooting I realized the channel issue was caused by a dirty selector switch, it’s good now and sounding great! Simple fix
The bias voltage sets up well and stays stable at 20mv using the loops on the emitter resistors.
I believe the wrong lamp where installed at some point and the heat melted the housing. I have replaced those with the correct spec since a have a few spares for my 2270.
I will move forward and replace power supply caps with nichicon FG. I believe the big 3300uf filter on PS and 2200uf capacitors on the main amp can increase a bit, is there any other strategic where is recommend to upgrade?
I have 2 Mundorf M-lytic AG 4700uf 40v in my parts drawer, I ordered the wrong size for my 1060. I would love to use them on the 2215b. It would be perfect for the power supply 3300uf location but original voltage rating is 55V... any thoughts?
This is exciting!
Here are a few pics:
My friend asked me to take a look at his receiver, he complained about having distortion and low volume on the right channel on a otherwise super clean and good looking receiver.
Besides the bad channel there is a momentary hum when amp is powered up, it seems like a power supply cap charging up. There is some cap sleeve shrinking on Power supply (C807, C805).
After troubleshooting I realized the channel issue was caused by a dirty selector switch, it’s good now and sounding great! Simple fix
The bias voltage sets up well and stays stable at 20mv using the loops on the emitter resistors.
I believe the wrong lamp where installed at some point and the heat melted the housing. I have replaced those with the correct spec since a have a few spares for my 2270.
I will move forward and replace power supply caps with nichicon FG. I believe the big 3300uf filter on PS and 2200uf capacitors on the main amp can increase a bit, is there any other strategic where is recommend to upgrade?
I have 2 Mundorf M-lytic AG 4700uf 40v in my parts drawer, I ordered the wrong size for my 1060. I would love to use them on the 2215b. It would be perfect for the power supply 3300uf location but original voltage rating is 55V... any thoughts?
This is exciting!
Here are a few pics:
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