[TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown (both) speaker
- From: Scott Beebe <Scott@xxxxxxxxxxxxxxxxxxxxx>
- To: Tel-Tek Electronics <techassist@xxxxxxxxxxxxx>
- Date: Mon, 13 Mar 2006 08:43:00 -0500
Hello Tel-Tek,
Far as questionable amps, I will use some speakers I grab out of TV sets when
they are junked. They come in all types of impedances. I also have a Sencore
PA81 Stereo analyzer that I use so I can run a loud volume and remain
protected. Only when I am satisfied there is no more problem with the amp, do I
hook it up to the good bench speakers.
-- As far as the dimming headlights, adding another 4ga ground wire from the
battery to the chassis will usually solve that.
Thanx,
Scott Beebe
Ohm Electronics Inc.
609 W. Clinton St.
Ithaca NY 14850
Voice: (607) 273-8406
Fax: (607) 273-8743
WWW.OhmElectronicsInc.com
mailto:Scott@xxxxxxxxxxxxxxxxxxxxx
Monday, March 13, 2006, 8:20:21 AM, you wrote:
Tel-Tek> Yeah....we have a couple of those up this way too.
Tel-Tek> Can hear them coming from 2 blocks away. Seem to use the whole car as
Tel-Tek> one big Woofer. On a Saturday night, you can
Tel-Tek> actually see the headlights
Tel-Tek> dim with each Bass note.
Tel-Tek> -Ed-
Tel-Tek> Tel-Tek Electronics
Tel-Tek> Ontario-Canada
Tel-Tek> TechAssist Member 2003.
Tel-Tek> PS:
Tel-Tek> If replying to this email, please include all threads.
Tel-Tek> teltek3@xxxxxxxxxxxx
Tel-Tek> Al Gutz wrote:
>> Ed
>> Yes they have improved, now they use 1500 to 3000 watt amplifiers.
>>
>> Al G
>>
>> Tel-Tek Electronics wrote:
>>> Hey Peter..Can I "Capacitance Couple" my Test speakers?
>>> Seem to blow one or both each year, and I do very little Audio.
>>>
>>> I found Audio a pain in the rear...due to what the customer would hook
>>> up, after he got the unit home.
>>>
>>> Used to do allot of Pioneer Car Audio in the 80's...The kids would bring
>>> these back every couple of months, expecting warranty...hooked up with
>>> common grounds...150W to 300W...mismatched speakers...tin foil in fuse
>>> links...I just could not keep up....
>>>
>>> Tell me...are kids getting any better? ;-)
>>>
>>> -Ed-
>>> Tel-Tek Electronics
>>> Ontario-Canada
>>>
>>> TechAssist Member 2003.
>>>
>>> PS:
>>> If replying to this email, please include all threads.
>>>
>>>
>>> teltek3@xxxxxxxxxxxx
>>>
>>> Peter oliver wrote:
>>>
>>>> I agree change the IC, the hum is most likely DC voltage going to the
>>>> speakers, Our test bench speakers are capacitor coupled to prevent DC
>>>> shorts
>>> >from blowing them, with a hum and blown fuses you must check the customers
>>>> speakers and wireing as they are the most likely cause and/ or are damaged
>>> >from the short in the amps output, since you may fix the amp to have it
>>>> blown by the customers damaged speakers/wires. We have seen speaker and or
>>>> wire problems enough that We will not warranty any amp work if the speakers
>>>> and wires are not checked. (make sure they didn't use car speakers,
>>>> non-powered sub woofers, ... etc-- any low impedace/high draw item) The
>>>> only
>>>> other cause for a hum might be bad grounds, filter caps or a predriver but
>>>> output IC is most likely.
>>>>
>>>> Peter Oliver
>>>> Tucson Radio TV
>>>>
>>>> From: Tel-Tek Electronics <teltek3@xxxxxxxxxxxx>
>>>> Reply-To: techassist@xxxxxxxxxxxxx
>>>> To: techassist@xxxxxxxxxxxxx
>>>> Subject: [TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown
>>>> (both)
>>>> speaker fuses. Replaced, now loud hum?
>>>> Date: Sat, 11 Mar 2006 15:55:21 -0500
>>>>
>>>> Definitely change the STK2250, only about $10 from www.pacificsemi.com
>>>>
>>>> Not to presume that this will fix your problem, but a good start.
>>>>
>>>> You need a minimum order of $25 to order from them, so you may do better
>>>> trying to get it locally.
>>>>
>>>> -Ed-
>>>>
>>>>
>>>> Tel-Tek Electronics
>>>> Ontario-Canada
>>>>
>>>> TechAssist Member 2003.
>>>>
>>>> PS:
>>>> If replying to this email, please include all threads.
>>>>
>>>>
>>>> teltek3@xxxxxxxxxxxx
>>>>
>>>> Robinson Electronics wrote:
>>>>> Can any of you stereo Techs. help me with this receiver?
>>>>> Never worked on Sherwood amps.
>>>>> Both of the speaker fuses were blown, replaced fuses "5A", now has a loud
>>>>> hum noise when powered on, even with volume all the way down.
>>>>> This one uses 1 IC (STK2250), don't have a datasheet on it, and cannot
>>>> tell
>>>>> if it is causing the problem - still checking.
>>>>> Pins 4,5, & 6 are reading a "short" together, and
>>>>> 10,11,12, &13 are also reading a "short" together?
>>>>> Can anyone help me with this, very much appreciated.
>>>>> Thanks. David.
>>>>>
>>>>> Robinson Electronics
>>>>> 1075 Sweeten Creek Road #51
>>>>> Asheville, NC 28803-1757
>>>>> Ph./Fax. 828 274-3787
>>>>> Toll Free. 1-888 ROBELECT
>>>>> www.robinsonelectronics.com
>>>>> www.robelect.com
>>>>> Mailto: RobinsonElectronics@xxxxxxxxxxx
>>>>>
>>>>>
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