Orion 2150GX Repair Help

[90scaraudio]

Originally Posted by knil7777

Well, just as I posted that last I looked back at 90scaraudio's post and it looks like that transistor you mentioned is the same part, these have MPSU but I bet that CEN is the equivalent part, if so I am very interested in buying some off of you.

Let me know how many you need. Email me at scott.leanne@frontier.com
Yes they are the same...

[mbates14]

are these pre-drivers or post drivers? post-drivers (drivers directly tied to outputs) i end u replacing with MJE based parts. every amp is different, but ive seen some with only 1 driver pair, some with 2 layers, and even high power ones with 3 layers of drivers. crazy...

The last orion like this i worked on, i junked it. gave me too many headaches. the power supply stage would whine and do weird stuff. no shorts anywhere, but half the bank would heat up quickly in the power supply section and the other half was ok. twisting the torroid reveled the fault. So i junked it.

[knil7777]

I assume these are pre driver, I pulled out that bad MPSU 07 and had the anp actually power up and had the other channel playing. I got too aggressive and and started cranking the volume to see how much power I was getting and it looks like I blew another transistor pair on that channel (my fault for not putting more screws in the clamp) I'm trying to get about 6 of those driver transistors off of 90caraudio and I'm going to replace all the other power supply transistors since this amp is like 25 years old. At this point I know it is about just restoring an old piece of car audio history and having the pleasure of knowing I could get it going. The only other thing I noticed while I had the other channel playing was that there was some noise (between songs it had a low hertz pulse)

[Perry Babin]

Do you have any transistors on hand as of now?

Did you read all of the information on the older Orion amps in the miscellaneous stuff folder? search for all .txt and all .htm files in the following folder and read all of it. There isn't anything specific that you need to know right now but you should read it.
repair_tutorial\miscellaneousstuff\orion

[90scaraudio]

Originally Posted by knil7777

I assume these are pre driver, I pulled out that bad MPSU 07 and had the anp actually power up and had the other channel playing. I got too aggressive and and started cranking the volume to see how much power I was getting and it looks like I blew another transistor pair on that channel (my fault for not putting more screws in the clamp) I'm trying to get about 6 of those driver transistors off of 90caraudio and I'm going to replace all the other power supply transistors since this amp is like 25 years old. At this point I know it is about just restoring an old piece of car audio history and having the pleasure of knowing I could get it going. The only other thing I noticed while I had the other channel playing was that there was some noise (between songs it had a low hertz pulse)

The TIP 31 and 32 work but you have to move the EBC different.
Mouser has these for $0.60 ea.

[Perry Babin]

Using the TO-220 in place of the TO-202 is shown on the Tech Tips 7 page, item #24.

[pergo]

MPSW06 and MPSW56 are suitable
I've always use them for replacement.

[90scaraudio]

Using the TO-220 in place of the TO-202 is shown on the Tech Tips 7 page, item #24??
Perry... Tried searching for this and cant find it... Sorry, could you please point me in the right direction.

[90scaraudio]

Originally Posted by pergo

MPSW06 and MPSW56 are suitable
I've always use them for replacement.

Can they handle the heat and voltage that the CENs handle?

[Perry Babin]

It's on the DVD tutorial. This is a screen cap:
http://www.bcae1.com/temp/to220-to202conversion01.jpg

The MPSA parts are typically OK for testing and in the pre-driver locations but in the larger amps, they are not suitable in the driver locations.