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Old 13th November 2012, 10:41 PM   #21
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If the bias is set and the amp produces clean output up to clipping, the problem is likely in the differential amplifier stage. Those are the MPS6521s and MPS6523s just after the op-amp that feeds the channel. They need to be replaced in pairs with transistors from the same batch (same date code).
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Old 2nd April 2013, 10:17 PM   #22
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Quote:
Originally Posted by Perry Babin View Post
If the bias is set and the amp produces clean output up to clipping, the problem is likely in the differential amplifier stage. Those are the MPS6521s and MPS6523s just after the op-amp that feeds the channel. They need to be replaced in pairs with transistors from the same batch (same date code).
This amplifier is 90% finished, I just need to source the following transistors or good replacements of MPS6521s and MPS6523s from the same batch (same date code).
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Old 3rd April 2013, 12:58 AM   #23
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Contact Rockford if you can't find them from any distributors.

If they can't supply them, ask them if there is a recommended substitute.
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Old 3rd April 2013, 03:17 PM   #24
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Quote:
Originally Posted by Perry Babin View Post
If the bias is set and the amp produces clean output up to clipping, the problem is likely in the differential amplifier stage. Those are the MPS6521s and MPS6523s just after the op-amp that feeds the channel. They need to be replaced in pairs with transistors from the same batch (same date code).
So the 21's and the 23's have to have the exact date codes, or do you mean the 21's all have to have the same date code and all the 23's have to have the same date code?
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Old 3rd April 2013, 07:26 PM   #25
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The transistors with the same part number have to have the same date code.
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Old 17th May 2013, 10:56 AM   #26
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I've found this supplier on eBay "componenttradersllc" for the transistors , has anyone else brought from this supplier ? I've messaged the lady & she said they fit Perry's requirements above. I need to finish my amp so if this sounds fine then I'll go ahead w/the purchase.

Dear primemova,

Sure we could do that. What do you want to pay for 60 total?

Clarissa

- componenttradersllc


Subject: has sent a question about item eBay item #150969981782,

MPS6523 TO-92 BIPOLAR JUNCTION TRANSISTOR NEW QUANTITY-450


Dear componenttradersllc,

Need matched pairs of both mps6521 & mps6523 around 30 of each ?

- primemova
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Old 22nd May 2013, 01:40 AM   #27
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I have not bought from them before. I have messaged her a few times.

Give them a try.
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Old 22nd May 2013, 03:44 AM   #28
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Originally Posted by seankane View Post
I have not bought from them before. I have messaged her a few times.

Give them a try.
Thanks bro, I'll let everyone here know how the transistors workout.
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Old 4th June 2013, 09:52 PM   #29
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Location: I live in Hattiesburg,Mississippi
Would you be intrested in sell ing the Power 1000c if call kip at 601 325 0464
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Old 4th June 2013, 09:59 PM   #30
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Would you be intrested in sell ing the Power 1000c if call kip at 601 325 0464
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