soundstream reference 414 driver card rebuild or possible replacement

ivkata · 14th April 2012, 08:55 PM

thank you for taking the time to look at mu listing

I have Soundstream reference 414s for repair here as one of the channels was sending rail voltage on the speaker terminals.Ive removed all the outputs as 2 are defective as well as all gate resistors as 2 are dead as well.The issue I'm having is with the driver board as it appears that one of the large transistors got hot and 1 resistor connected to it looks brownish so I'm thinking about repairing or replacing this one.Please advice if those are available somewhere or maybe u have spares and wanna hook me up
thankxx

1moreamp · 14th April 2012, 11:24 PM

They made two types of cards for this era of SoundStream amp. One with MPSa-18's as the input pair and one with a dual transistor in a single package 2SC3067 as I recall. Which one do you have ? Perhaps a picture if possible ?

ivkata · 14th April 2012, 11:45 PM

posting photo now i thought it might be easier to repair/replace this with the board out
thank you

http://www.freeimagehosting.net/48bbo

1moreamp · 15th April 2012, 01:11 AM

Ah, You have the 2SC3381 input transistor. I have tech info on this. PM me if you like.

azvrt · 15th April 2012, 02:59 PM

I once had 30 volts DC on the speaker terminals of a Ref 300.
A short while later it did not function at all anymore.
Replacing the rectifiers permanently solved it.
Regardless, I would replace the rectifiers on your amp, while you're at it.
Also, check the quality of the solder joints of your driver boards, very important.
Looking at the schematics, it makes use of FEP16DT and FEN16DT rectifiers.
Jaime sells them, as well as the driver boards. Good luck !

ivkata · 15th April 2012, 05:27 PM

Quote:

Originally Posted by azvrt

I once had 30 volts DC on the speaker terminals of a Ref 300.
A short while later it did not function at all anymore.
Replacing the rectifiers permanently solved it.
Regardless, I would replace the rectifiers on your amp, while you're at it.
Also, check the quality of the solder joints of your driver boards, very important.
Looking at the schematics, it makes use of FEP16DT and FEN16DT rectifiers.
Jaime sells them, as well as the driver boards. Good luck !

thanks for the advice .With this amp i don't see issues with the rectifiers as the other 3 channels output clean and loud audio.I will reflow the driver cards prior reassembling the amp back .Ive looked for Jaime on ebay but it appears he's no longer selling there .due to ebay crooked policies allot of good parts guys are no longer offering those hard to find parts .The main problem I'm having is supplying the 3381 that is no longer in stock on the main parts suppliers .I was able to find it on Futurlec however i have never purchased parts there so if someone had in the past ,please advice

azvrt · 15th April 2012, 07:43 PM

If 3 out of 4 channels are functioning properly then the rectifiers are fine.
I would DEFINITELY apply some fresh solder to the solder joints of the driver PCB's.
Then, without assembling the amp, power it on and check whether the bad channel functions properly. Do not have the amp play for more than a minute or it will overheat ! Try and perform your tests in no more than half a minute at a time.

If it functions properly, you can assemble it. If it doesn't, than it has other issues than the solder joints.
But I have seen it time and again, bad solder joints causing problems on these amps.
Before replacing parts, it's a thing to do.

Try contacting Jaime at jandrelectronix@aol.com for parts.
He's hard to reach though.

14th April 2012, 08:55 PM	#1
ivkata diyAudio Member Join Date: Dec 2010	soundstream reference 414 driver card rebuild or possible replacement thank you for taking the time to look at mu listing I have Soundstream reference 414s for repair here as one of the channels was sending rail voltage on the speaker terminals.Ive removed all the outputs as 2 are defective as well as all gate resistors as 2 are dead as well.The issue I'm having is with the driver board as it appears that one of the large transistors got hot and 1 resistor connected to it looks brownish so I'm thinking about repairing or replacing this one.Please advice if those are available somewhere or maybe u have spares and wanna hook me up thankxx

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14th April 2012, 11:24 PM	#2
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	They made two types of cards for this era of SoundStream amp. One with MPSa-18's as the input pair and one with a dual transistor in a single package 2SC3067 as I recall. Which one do you have ? Perhaps a picture if possible ?

14th April 2012, 11:45 PM	#3
ivkata diyAudio Member Join Date: Dec 2010	posting photo now i thought it might be easier to repair/replace this with the board out thank you http://www.freeimagehosting.net/48bbo

15th April 2012, 01:11 AM	#4
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Ah, You have the 2SC3381 input transistor. I have tech info on this. PM me if you like.

15th April 2012, 02:59 PM	#5
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	I once had 30 volts DC on the speaker terminals of a Ref 300. A short while later it did not function at all anymore. Replacing the rectifiers permanently solved it. Regardless, I would replace the rectifiers on your amp, while you're at it. Also, check the quality of the solder joints of your driver boards, very important. Looking at the schematics, it makes use of FEP16DT and FEN16DT rectifiers. Jaime sells them, as well as the driver boards. Good luck !

15th April 2012, 07:43 PM	#7
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	If 3 out of 4 channels are functioning properly then the rectifiers are fine. I would DEFINITELY apply some fresh solder to the solder joints of the driver PCB's. Then, without assembling the amp, power it on and check whether the bad channel functions properly. Do not have the amp play for more than a minute or it will overheat ! Try and perform your tests in no more than half a minute at a time. If it functions properly, you can assemble it. If it doesn't, than it has other issues than the solder joints. But I have seen it time and again, bad solder joints causing problems on these amps. Before replacing parts, it's a thing to do. Try contacting Jaime at jandrelectronix@aol.com for parts. He's hard to reach though.