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#1 |
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diyAudio Member
Join Date: Dec 2002
Location: Left of the Dial
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I have a Marantz 2600 that was bought with a supposedly blown transformer. Upon investigation, looks like the transformer is fine, but there are lots of other problems, including a lots of blown output transistors (the unit has 8 per channel), and numerous blown transistors on the driver boards.
My real problem at the moment are some blown 2SA939 and 2SC2071 TO-126-style transistors.These are pre-drivers, and the amp has +/-105V power rails. The A939 and C2071 are rated for 250V and 50mA, and are reasonably wide bandwidth devices at 100MHz. I bought some a while back from Consolidated Electronics, since I could not find them anywhere else, and ended up never using them. Well, now I need them...or something like them. My paranoia comes from the marking of these transistors as compared to the originals (see pic). I think my replacements from Consolidated are junk. No gain group marking on the 939, and to me they just don't look right. Anyone care to comment? If I decide NOT to use these transistors (and if you've had one of these receivers apart, you know what a nightmare it is, and that you want to get it right the first time), what can I use as a replacement in a TO-126 form factor? I've looked all over, and most of the possible replacements are dog-slow (10MHz or so) compared to these originals... Any help is appreciated. I'm at a loss as to what to do. Edit: Looks like the leads on the ones from Consolidated are also reversed...BCE instead of ECB. Another sign that I should throw these out.
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#2 |
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diyAudio Member
Join Date: Dec 2002
Location: Left of the Dial
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How about the Sanyo 2SA1353 / 2SC3417?
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#3 |
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diyAudio Member
Join Date: Dec 2002
Location: Left of the Dial
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Last question...where is the de-cloaking button for my posts?
Bought the 2SA1353 / 2SC3417. Thanks anyway. |
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| Thread | Thread Starter | Forum | Replies | Last Post |
| ### Counterfeit transistors | small_boy | Solid State | 60 | 29th July 2010 01:40 AM |
| Are these transistors counterfeit? | geaugafletcher | Parts | 4 | 18th January 2007 04:36 PM |
| marantz receiver | odysseybmx414 | Solid State | 12 | 30th December 2006 09:36 PM |
| Counterfeit transistors??? | peter5 | Solid State | 1 | 20th February 2002 08:34 AM |
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