I believe the upgrade path on the transistors were:
1. MJ15024 to,
2. MJ21194.
Those were NPN transistors. Verify on your amp if they were NPN or PNP. I believe he used the same design on his amps with both rails using NPN output drivers in a nice circuit configuration.
The DC offset could be from a number of causes. But, check the output/pre-drivers and bias transistors. A standard inexpensive transistor checker and you are good to go.
You can upgrade the power supply caps to 42,000 microfarad caps with the soft start circuit implemented. with bypass caps also attached.
my amp actually had enough internal room that I could separate the power supply and have one for each channel. with added rectifiers, caps, etc.
I decided that I didn't want to spend the time designing a soft start circuit since there are many already out there, so I (ahem) borrowed a design from DIYAudio.
it is the DIYAudio soft start circuit 2012. Very simple and inexpensive.
I got my own board and parts and it works very well.
If you can't find it on-line, message me and I'll send you the schematic
Most solid state amps have push/pull complementary NPN/PNP output drivers. the Bedini amps I've encountered used NPN output drivers on both rails. Easy to do if your pre-pre drivers are reversed. I guess he didn't want to try to match NPN/PNP transistors.
enjoy
1. MJ15024 to,
2. MJ21194.
Those were NPN transistors. Verify on your amp if they were NPN or PNP. I believe he used the same design on his amps with both rails using NPN output drivers in a nice circuit configuration.
The DC offset could be from a number of causes. But, check the output/pre-drivers and bias transistors. A standard inexpensive transistor checker and you are good to go.
You can upgrade the power supply caps to 42,000 microfarad caps with the soft start circuit implemented. with bypass caps also attached.
my amp actually had enough internal room that I could separate the power supply and have one for each channel. with added rectifiers, caps, etc.
I decided that I didn't want to spend the time designing a soft start circuit since there are many already out there, so I (ahem) borrowed a design from DIYAudio.
it is the DIYAudio soft start circuit 2012. Very simple and inexpensive.
I got my own board and parts and it works very well.
If you can't find it on-line, message me and I'll send you the schematic
Most solid state amps have push/pull complementary NPN/PNP output drivers. the Bedini amps I've encountered used NPN output drivers on both rails. Easy to do if your pre-pre drivers are reversed. I guess he didn't want to try to match NPN/PNP transistors.
enjoy