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Orion 425 hcca first gen blowing fuses
Orion 425 hcca first gen blowing fuses
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Old 8th July 2019, 02:31 PM   #31
GEM 592 is offline GEM 592  United States
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OK I will try that.
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Old 8th July 2019, 02:39 PM   #32
GEM 592 is offline GEM 592  United States
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I pried off all six I desoldered on that side

M (Motorola symbol) K
2N6488
8835
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Old 8th July 2019, 03:09 PM   #33
GEM 592 is offline GEM 592  United States
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I wonder if you have any opinion or experience in using NTE331 as a substitute? It is listed a few places as an equivalent, the spec sheets look about the same, and I can pick them up today.
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Old 8th July 2019, 03:18 PM   #34
Perry Babin is offline Perry Babin  United States
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I recemmend that you avoid NTE or any other sub. Use parts purchased from an authorized distributor. Mouser and Digikey are both good choices.

When repairing amps like this, you need to have parts that match closely. You don't have to do any special testing but you should use parts with matching date codes. When ordering small quantities, they sometimes just send what's loose. I'd suggest that you order far more than you need if they won't guarantee matching date codes. That will give you a better chance of having enough matching parts.

Do NOT buy from ebay.
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Old 8th July 2019, 03:58 PM   #35
GEM 592 is offline GEM 592  United States
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These look like the only available on DigiKey:

2N6488G ON Semiconductor | Discrete Semiconductor Products | DigiKey

They have a nice price break at 50, so I was just going to order and shelve it until they arrive.
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Old 8th July 2019, 04:01 PM   #36
GEM 592 is offline GEM 592  United States
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The good news is the transformer does not appear to be shorted, once the bad device was desoldered the four pairs of windings were all separated by high impedance.
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Old 8th July 2019, 04:12 PM   #37
GEM 592 is offline GEM 592  United States
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Ouch! $3.85 extra for "tariff"
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Old 12th July 2019, 12:08 AM   #38
GEM 592 is offline GEM 592  United States
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I got the transistors today, installed, reassembled amp, and it has been running a while now.

Everything seems normal, sounds very good, probably better.

When I first took the board off the sink, I noticed the clamps were quite loose. Possibly (in addition to being 31 years old) the heat sink mating was to blame.

Perry:

Again, thank you very much for your help - very much appreciated. If you are going to be in the way of the weather heading into the state this weekend, best wishes.
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Old 12th July 2019, 06:52 AM   #39
Perry Babin is offline Perry Babin  United States
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The double-sided tape compresses when heated and the clamps have to be re-tightened several times during burn-in. I use silicone rubber tape when I repair them so I only have to snug them down once.
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Old 12th July 2019, 07:49 AM   #40
GEM 592 is offline GEM 592  United States
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Thank you. I am going to make sure that after some thermal cycling (which will sound pretty good) the board is seated correctly. It didn't quite seat perfectly on the first try because of the rectifiers behind the board.

The clamps were loose when I first tore into it, and when I reassembled it the devices I replaced were the hardest to seat down firmly. Maybe not a coincidence, it is an old amp - who knows.

I probably should have just checked this when I got the amp, and should do so henceforward.
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