vijay@albanycs.Albany.Edu (Vijay Vaidyanathan) (06/25/89)
My Fisher amp began smokin a while back and the only component that looks "smoky" is a thingy that looks like a Transistor, and is bound to a Heat Sink. The number on it is D 612 K and has the letters EL printed near one leg and "2" near another. Nothing near middle leg. The IC Master that I had access to came up with nothing. Can some kind experienced netter tell me what this chip is and whether there is an equivalent number I can ask for at Radio Shack ? (They hadn heard of this either). Sorry if this is the inappropriate group (or an inappropriate Query!), but no harm intended. Will absorb all constructive flaming attacks. Thanks. - Vijay ------- vijay@cssun.albany.edu vijay@albanycs.albany.edu -------------------------
pnelson@antares.UUCP (Phil Nelson) (06/25/89)
In article <320@albanycs.Albany.Edu> vijay@albanycs.Albany.Edu (Vijay Vaidyanathan) writes: >My Fisher amp began smokin a while back and the only component >that looks "smoky" is a thingy that looks like a Transistor, and >is bound to a Heat Sink. The number on it is D 612 K and has the >letters EL printed near one leg and "2" near another. Nothing near I don't know what it is, but I have a suggestion. Write the model number down and find a Sam's Photofact for it. If it's an old amp, you may be able to find the Photofact in the library. This will help you identify the component, may help you identify why it failed (if it did). I have to say that the chances of resurrecting a dead amp by replacing one component that "looks smoky" are not great. Sometimes it works, more often not. If you find the part you are looking for, consider the very real possibility that the replacement will burn out also, it may have failed as a result of another problem. I couple of wild guesses: 1-shorted speaker output, 2-leaky electrolytic cap. >Thanks. You're welcome, I hope it's some help. > >- Vijay >------- >vijay@cssun.albany.edu >vijay@albanycs.albany.edu >------------------------- -- Phil Nelson at (but not speaking for) OnTyme:NSC.P/Nelson Tymnet, McDonnell Douglas Network Systems Company Voice:408-922-7508 UUCP:{pyramid|ames}oliveb!tymix!pnelson LRV:Component Station "What we face is government troops and we have no guns." -Chinese student
tindle@ms.uky.edu (Ken Tindle) (06/25/89)
In article <320@albanycs.Albany.Edu> vijay@albanycs.Albany.Edu (Vijay Vaidyanathan) writes: >My Fisher amp began smokin a while back and the only component >that looks "smoky" is a thingy that looks like a Transistor, and >is bound to a Heat Sink. The number on it is D 612 K and has the >letters EL printed near one leg and "2" near another. Nothing near It's a 2SD612 transistor, $1.03 each from MCM Electronics, for one possible supplier. SK series probably has an equivalent, too. That device is probably the positive DC supply regulating pass transistor. Other components in the supply need to be checked, or the output stage may have a problem causing tremendous current flow. Either way, it's likely to be a symptom, not a cause. --------------------------\ /------------------------------------------ INTERNET:tindle@ms.uky.edu | "I heard you." -Kirk BITNET:tindle@ukma.bitnet | "He simply could not believe his ears." Ken Tindle - Lexington, KY | -Spock, The Trouble With Tribbles --------------------------/ \------------------------------------------
wiz@xroads.UUCP (Mike Carter) (06/27/89)
When folks write to the NET about "Unknown parts" or the likes, it would help those of us willing and quite capable of identifying them if the original post would contain MODEL numbers to the equipment, and perhaps part designation (like "R404") etc that is normally printed on most consumer elctronics circuit boards. Burnt parts with partial numbers to a generic "FISHER AMP" mean nothing until a model number (i.E. A FISHER FS-505 200 WATT per channel amplifier or a HEAD-BANGER model #HB-1999) is given. TRY AGAIN -Mike -- ============================================================================= = Mike Carter N7GYX, Phoenix AZ| Q: Why did the Chicken cross the road ? = = hplabs!hp-sdd!crash!xroads!wiz| A: To ESCape the Main Menu . = =============================================================================
zahid@neptune.AMD.COM (Zahid Ahsanullah) (07/01/89)
In article <320@albanycs.Albany.Edu> vijay@albanycs.Albany.Edu (Vijay Vaidyanathan) writes: >My Fisher amp began smokin a while back and the only component >that looks "smoky" is a thingy that looks like a Transistor, and >is bound to a Heat Sink. The number on it is D 612 K and has the >letters EL printed near one leg and "2" near another. Nothing near >middle leg. The IC Master that I had access to came up with nothing. > >Thanks. > >- Vijay Try locating a japanese 2SD612. Its possible that this is a power transister. Usually the japanese configuration are 2sa,2sb,2sc,2sd with two or more number attached to the end of this prefix. The short form for 2sd218 would be d218. regards Zahid
brian@ucsd.EDU (Brian Kantor) (07/03/89)
My Newtone xref crosses the 2SD612K to an NTE184; this is listed as a Silicon NPN in a TO-126 case. 4A IC, 80V BVcbo/ceo, 4V BVebo, hFE 25 (min), 40W PD, 2MHz FT. They're also available as the NTE184MP, a matched pair. NTE replacements are typically found in radio/tv service supply shops; for comsumer equipment repair they're usually quite good enough. - Brian