Soundstream XXX-6500D - What is the value of R4? - diyAudio
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Old 15th May 2014, 02:51 AM   #1
RiLoWa is offline RiLoWa  United States
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Default Soundstream XXX-6500D - What is the value of R4?

If anyone has a schematic that they could share with me, that would be great too.
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Old 15th May 2014, 03:24 AM   #2
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4.7 ohms.

email me

babin_perry@yahoo.com
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Old 16th May 2014, 03:53 AM   #3
RiLoWa is offline RiLoWa  United States
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Thank you Perry.

I found some other obvious owner replaced parts that with the diagram allowed me to get the right ones in there.
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Old 16th May 2014, 03:57 AM   #4
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These amps (and similar amps) have a weak drive signal. The pulldown resistor (R6 and R21) is a 4.7k. I'd reduce it to at least a 1k. The most common symptom that this is a problem is the power supply FETs running hot at idle.
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Old 16th May 2014, 04:28 AM   #5
RiLoWa is offline RiLoWa  United States
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Thanks for the tip.

For the record, I have installed the BD139 / BD140 combo as the drivers. Does that change your recommendation at all?

I placed an order for the power supply FETs, so I don't have those yet, but I did check the drive signal to this point and thought it looked good.
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Old 16th May 2014, 06:40 AM   #6
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The recommendation remains. If the FETs idle hot, drop them to a 330 ohm 1/4w.
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Old 16th May 2014, 11:10 PM   #7
RiLoWa is offline RiLoWa  United States
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A couple of questions, this amp has 2K Ohm resistors that look factory installed at R5, R6, R20 & R21 instead of 4.7K. Was that possibly a revision to address that problem?

Should I still change out R6 and R21 since you may have assumed there were 4.7K ohm resistors installed at R5 and R20?
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Old 17th May 2014, 02:48 AM   #8
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That should be sufficient. If it is not (FETs getting hot at idle), reduce the value of those 4 resistors.
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