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Old 1st February 2013, 07:22 PM   #31
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Just scored another 25 D41D8 transistors from a gentleman in Canada at a very good price.
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Old 3rd February 2013, 12:07 AM   #32
shawnk is offline shawnk  United States
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Quote:
Originally Posted by Perry Babin View Post
You now need to test it with a load (all transistors clamped, fan not necessary because you need it to heat up). Let it heat up about 10 and see how the idle current has changed.

Done! I just drove the amp (both "repaired" channels 4 ohm load each) with a sinewave for a good 20 minutes and let the amp warm up significantly.

The amp drew ~1.5A at idle when first fired up (cool to the touch) and after the 20 min run, current draw only icreased by ~0.25A. So even when warmed up idle current was still less than 2A. After the run, the output pins for each op-amp remained clean/flat and there was no more dc offset present.

This is all great, but I'm just wondering why the amp is acting differently than my previous testing. I haven't done anything different to it other than present a load.

Thanks
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Old 3rd February 2013, 12:08 AM   #33
shawnk is offline shawnk  United States
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Quote:
Originally Posted by seankane View Post
Just scored another 25 D41D8 transistors from a gentleman in Canada at a very good price.
Nice score!!!
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Old 3rd February 2013, 12:44 AM   #34
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DC can do wierd things in these old amps. Sometimes these amp are stable and sometimes they are haunted....lol!!!

I have 2 brand new bottom covers for these amps and I noticed you had a green board version which was the last models before they were discontinued. My 4 power 650's were all the older models with the DIN which I removed and replaced with RCA jacks of course.

The selector switch for 4 channel and 2 channel must be different on the later models, like a very small switch. The hole in the sheet metal I have is very small and cannot accomedate the older version slide switch.

I was wondering if you could post a pic of the switch on your board and the bottom cover where the switch comes through???
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Old 3rd February 2013, 12:55 AM   #35
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Just scored another 250 D40D8 transistors for a good deal.
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Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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Old 3rd February 2013, 03:16 AM   #36
shawnk is offline shawnk  United States
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Quote:
Originally Posted by seankane View Post
DC can do wierd things in these old amps. Sometimes these amp are stable and sometimes they are haunted....lol!!!

I have 2 brand new bottom covers for these amps and I noticed you had a green board version which was the last models before they were discontinued. My 4 power 650's were all the older models with the DIN which I removed and replaced with RCA jacks of course.

The selector switch for 4 channel and 2 channel must be different on the later models, like a very small switch. The hole in the sheet metal I have is very small and cannot accomedate the older version slide switch.

I was wondering if you could post a pic of the switch on your board and the bottom cover where the switch comes through???

Sure man. I'll snap a couple pics in the morning for you.

I have two of these 650's here. One "newer" one has the green board and the shroud has the larger 4" fan.

I also have an older one which is the one giving me a hard time
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Old 3rd February 2013, 04:56 PM   #37
shawnk is offline shawnk  United States
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Pics for Sean! Let me know if you need any others bud...

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 4th February 2013, 06:09 AM   #38
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No thats perfect, the bottom covers I have are still different. Maybe they were a defect?

Where the 2 channel/4 channel switch is it is a very small opening. Maybe like they were going to give the 650 a facelift an modernize it a little then came up with the DSM's and bagged it.

These are brand new bottom covers. I could modify them to work, be nice to find a switch that would work with the slot that is cut ya know?
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Old 4th February 2013, 10:19 AM   #39
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Sean, give us a few pics of these bottoms.
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Old 4th February 2013, 11:21 AM   #40
shawnk is offline shawnk  United States
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Originally Posted by Prime mova View Post
Sean, give us a few pics of these bottoms.
yeah.... please do. Inquiring minds want to know
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