soundstream reference 300

mike49504 · 17th December 2009, 05:24 PM

Hi wondering if you know the value of theese resistors in the amp ? I cant make out what the color bands are and the amp that im working on someone cut them off the board.

Perry Babin · 17th December 2009, 05:33 PM

390 ohms

These run hot. Replace them with the highest wattage part that you can find that will fit in the allotted space and install them well off of the board. This will help prevent any further heat related damage to the circuit board.

mike49504 · 17th December 2009, 07:03 PM

There are 4 un05e that are bad also wondering what i can replace theese with??

mike49504 · 17th December 2009, 07:35 PM

or its on05e

Perry Babin · 17th December 2009, 07:36 PM

Where are these being used?

Are you sure you're seeing all of the part number?

How about an mtp50n05e?

mike49504 · 17th December 2009, 07:46 PM

ok thats the part number thats in the amp wondering is there a cross for theese??

Perry Babin · 17th December 2009, 08:14 PM

An IRFZ44 should be a good sub.

amc32 · 18th December 2009, 01:00 PM

z44's would be a good sub for personal use but wouldn't z48's be better?

Perry Babin · 18th December 2009, 07:48 PM

When I first began repairing amps, I always tried to make everything better by using parts with higher ratings. In some instances, it caused problems. Now, unless I can test a particular sub, I suggest the closest to the original (with only a few exceptions). The Z44 is very close to the original part and is, in my opinion, unlikely to cause any unforeseen problems. He could probably use Z46s, Z48s, NDP7060s, IRF3205s and not have problems but since these amps worked well for many years with the original parts, I believe that the Z44s will be a reliable replacement part.

marko · 19th December 2009, 11:10 AM

intersting, i have 4 ref-300's and none of them have the little blue pots i see on your amp next to the FEB's...

would these be for tweeking dc offset?

17th December 2009, 05:33 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	390 ohms These run hot. Replace them with the highest wattage part that you can find that will fit in the allotted space and install them well off of the board. This will help prevent any further heat related damage to the circuit board. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th December 2009, 07:36 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Where are these being used? Are you sure you're seeing all of the part number? How about an mtp50n05e? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th December 2009, 08:14 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	An IRFZ44 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

18th December 2009, 01:00 PM	#8
amc32 diyAudio Member Join Date: Mar 2008	z44's would be a good sub for personal use but wouldn't z48's be better? __________________ ...............I Hear in color.................

18th December 2009, 07:48 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	When I first began repairing amps, I always tried to make everything better by using parts with higher ratings. In some instances, it caused problems. Now, unless I can test a particular sub, I suggest the closest to the original (with only a few exceptions). The Z44 is very close to the original part and is, in my opinion, unlikely to cause any unforeseen problems. He could probably use Z46s, Z48s, NDP7060s, IRF3205s and not have problems but since these amps worked well for many years with the original parts, I believe that the Z44s will be a reliable replacement part. __________________ 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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17th December 2009, 07:03 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	There are 4 un05e that are bad also wondering what i can replace theese with??

17th December 2009, 07:35 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	or its on05e

17th December 2009, 07:46 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	ok thats the part number thats in the amp wondering is there a cross for theese??

19th December 2009, 11:10 AM	#10
marko diyAudio Member Join Date: May 2004 Location: donnyuk	intersting, i have 4 ref-300's and none of them have the little blue pots i see on your amp next to the FEB's... would these be for tweeking dc offset?

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