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Old 3rd October 2012, 01:52 PM   #31
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Thanks to 90scaraudio, I got the CEN07's and CEN57's in on monday (he ships alot faster than Mouser, since I am still waiting on the other parts). I decided to go through and just use the bare minimum components to make sure the amp would power up and after correcting a rookie mistake of soldering in the CEN07's backwards I was able to get the amp to power up. I didn't want to push my luck and called it a night since I had wasted a few fuses on my rookie mistake. Looking back I see where it was recomended to replace the tantium caps in this amp as well, I was so focused on the transistors and large voltage caps that I neglected to order these other caps. What symtoms should I look for to verfiy that these will need to be replaced once I have it up and running again. I assume it would be related to noise on the channels since these look like they are in their as a filter.
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Old 3rd October 2012, 03:19 PM   #32
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I cant remember why but 1moreamp suggested I replace them. Anyone know why these should be replaced?
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Old 4th October 2012, 08:56 PM   #33
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I got the parts in from Mouser yesterday and bunkered down on my work bench till 4:30 in the morning. It was an awesome sense of satisfaction hearing both channels play for the first time in over 16 years (my brother owes me big time). Many thanks to 90scaraudio for the obsolete transistors. I still noticed a low level of noise on each channel(kind of like a low hertz pulse that I noticed in between songs). I assume it must be in the preamp section. I will look into it a bit more after work. Thanks to every one for the help!!!
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Old 5th October 2012, 01:34 AM   #34
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Curious, the only time I hear this noise is when I play through the CD source of my test radio (which is on a separate power supply with the ground linked to my big Pyramid power supply). I wonder since this amp was designed before CD players and somehow it is picking up interference from the laser. I may just still be exhausted from the long night of working on it followed by a long day at work, I think I will take the night off from electronic repair and look at it later. Still just riding the high of getting it playing again.
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Old 5th October 2012, 02:49 AM   #35
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You need to tie the grounds of the two power supplies together.
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Old 5th October 2012, 03:46 AM   #36
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I have the grounds from each front post of the power supplies linked together with an alagator clip, it was worse before I did this last night, maybe I need to use a heaver gauge wire instead of the small alligator clip wire. I guess I could also drive both the amp and test radio from the pyramid power supply.

Thanks Kelvin
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Old 5th October 2012, 04:05 AM   #37
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If you're going to use a car head unit as a signal source, you should use two supplies. There are many times where you'll overload the supply powering the amp causing it to shut down. If you have the head unit connected to that same supply. It will shut down. It may come back on without having to turn it on but is generally won't. That will become annoying.

You shouldn't need anything more than a jumper wire. They are generally grounded through the 3-prong AC plug but sometimes the ground trace gets burned and the connection is lost.
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Old 6th October 2012, 04:50 AM   #38
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Thanks Perry,
I remember that tip from your tutorial which is why I had my bench in that particular configuration. When I forgot the jumper on one amp I had some wicked noise until I put the jumper back. The weird thing about this Orion amp is that when I tried to run both the head unit and the amp from my big power supply to see if it would eliminate the noise, is that it sounded real clean. I guess these older amps are a lot more susitiable to noise than the modern amps. Also these things seem to be amp hogs. While running my sine wave endurance test, I have observed this amp requires about 45 amps to produce ~16 VAC on the audio output load of my power transistors. I may be missing something but just from what I have worked on previously, this amp seems to be very inefficient. None the less I am on very excited about getting it going again. Also 90scaraudio pointed out that this amp is not rated to run at 2 ohms bridged mode which is what my brother had it running at. He said it got real hot but the killing blow was when the sub box slid forward and caused the orion battery cable to short out against the body of a pioneer amp. Even though the amp has been dead for 15 years he distinctly remembers the arc weld that was left on the pioneer amp when this happened.
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Old 6th October 2012, 04:51 AM   #39
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Sorry, I meant to say the 16 VAC was across my power resistors not transistors.
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Old 6th October 2012, 05:23 AM   #40
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Also Perry I have experience the frustration you described earlier. Every time I unhooked the turn on cable and switched speaker channels, the head unit would shut down due to the rush current this orion amp requires.
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