Boss American amp

mike49504 · 23rd April 2010, 04:19 AM

The outputs in this amp are BUZ21's The outputs are shorted wondering if theres a good sub for theese?

Also This amp looks like it was made by ZED AUDIO it has alot of Resistor packs that say ZED AUDIO on them. Did zed make amps for BOSS??

Perry Babin · 23rd April 2010, 04:27 AM

If you don't want to use the original replacement part, the IRF540 would probably work.

mike49504 · 23rd April 2010, 04:33 AM

Ok thanks Perry,

I also have another BOSS amp that came in today for repair Its using tip 35's and 36's They seem to test fine But im getting 1.51 volts of dc on the outputs.

Wondering what might cause this a leaking output? Or something else?

Perry Babin · 23rd April 2010, 05:15 AM

If it's not drawing excess current, I'd suspect one of the (4?) transistors that make up the differential amplifiers for that channel.

A leaking output would probably cause excessive current as the servo tried to correct for the offset.

jol50 · 23rd April 2010, 07:01 PM

Likely can search this site for it, iirc Boss and Pyle made or sold US made amps back in the day. Thinking Zed did make them much like PPI made them for many. Most say on the board or say made in USA.

spooney · 24th April 2010, 01:01 AM

zed did make a few boss amps. post a pic of the board. would be a tell tale sign

ppia600 · 24th April 2010, 03:49 AM

Yeah, they did. And so many people bought them for CHEAP and don't realize how good they are. I installed several that people bought at a local pawn shop new for dirt cheap. After installing the first and noticing the mosfet outputs through the clear cover I realized by the board components and design they weren't made by boss. Then after hearing them it confirmed my suspicion. What were they thinking, lol? Boss must have paid big to get them made to boost their reputation.

mike49504 · 12th May 2010, 04:05 PM

Back to this amp again The power supply fets are also blown. They are using BUZ102's with 100 ohm gate resistors.

Will 44's,3205's, 46's or ndp7060 work as a sub?

Perry Babin · 12th May 2010, 04:09 PM

The 44s should be a good sub.

mike49504 · 12th May 2010, 04:12 PM

Ok Thanks Perry,

I dont have to swap the gate resistors do i?

23rd April 2010, 04:19 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Boss American amp The outputs in this amp are BUZ21's The outputs are shorted wondering if theres a good sub for theese? Also This amp looks like it was made by ZED AUDIO it has alot of Resistor packs that say ZED AUDIO on them. Did zed make amps for BOSS??

23rd April 2010, 04:27 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you don't want to use the original replacement part, the IRF540 would probably work. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

23rd April 2010, 05:15 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it's not drawing excess current, I'd suspect one of the (4?) transistors that make up the differential amplifiers for that channel. A leaking output would probably cause excessive current as the servo tried to correct for the offset. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th April 2010, 03:49 AM	#7
ppia600 diyAudio Member Join Date: Jun 2007 Location: Louis y ana	Yeah, they did. And so many people bought them for CHEAP and don't realize how good they are. I installed several that people bought at a local pawn shop new for dirt cheap. After installing the first and noticing the mosfet outputs through the clear cover I realized by the board components and design they weren't made by boss. Then after hearing them it confirmed my suspicion. What were they thinking, lol? Boss must have paid big to get them made to boost their reputation. __________________ Don't worry... you can always turn the gain down!

12th May 2010, 04:09 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 44s should be a good sub. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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23rd April 2010, 04:33 AM	#3
mike49504 diyAudio Member Join Date: Sep 2006	Ok thanks Perry, I also have another BOSS amp that came in today for repair Its using tip 35's and 36's They seem to test fine But im getting 1.51 volts of dc on the outputs. Wondering what might cause this a leaking output? Or something else?

23rd April 2010, 07:01 PM	#5
jol50 diyAudio Member Join Date: Nov 2007	Likely can search this site for it, iirc Boss and Pyle made or sold US made amps back in the day. Thinking Zed did make them much like PPI made them for many. Most say on the board or say made in USA.

24th April 2010, 01:01 AM	#6
spooney diyAudio Member Join Date: Dec 2006	zed did make a few boss amps. post a pic of the board. would be a tell tale sign

12th May 2010, 04:05 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Back to this amp again The power supply fets are also blown. They are using BUZ102's with 100 ohm gate resistors. Will 44's,3205's, 46's or ndp7060 work as a sub?

12th May 2010, 04:12 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok Thanks Perry, I dont have to swap the gate resistors do i?

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