Memphis 16-mcd1000

bdgf2004 · 9th April 2011, 04:21 PM

The power supply was blown when I received this amp. I got the 3205 fets but it uses 2sa1266/2sc3198 for the emitter follower pair. I was wandering if there was a good replacement for those?

Perry Babin · 9th April 2011, 05:06 PM

There are many options. If you're trying to use something you have on hand, list ALL of the PNP transistors you have.

bdgf2004 · 9th April 2011, 06:33 PM

2n4403, mpsa56, mpsw56, 2n3906, mpsw92, ksa1220a, 2n5087

Perry Babin · 9th April 2011, 06:47 PM

Of those, I'd use the KSA1220. This is to replace the 1266. They don't use NPN drivers as far as I know.

bdgf2004 · 9th April 2011, 07:01 PM

thanks. i haven't even pulled the board yet to really check it out. i just saw 1 that was completely destroyed and others in the area so i read all the #'s i could see.

thank you. 1 day i will have confidence to choose my own replacements.

bdgf2004 · 9th April 2011, 08:10 PM

would 91 ohm work for the gate resistors? 3205's

Perry Babin · 9th April 2011, 09:49 PM

Probably not. I'd suggest that you use 47 ohm resistors.

bdgf2004 · 9th April 2011, 09:50 PM

i can make out the first line on 1 of the resistors and it appears to be red. so i figured that it was probably 2? ohm and all i had was a 20 and a 47. in the tutorial perry suggested 27-47 ohm so i am going to try the 47 ohm and see what happens.

Perry Babin · 9th April 2011, 10:10 PM

I should have looked at the photos I have. The originals are 22 ohms and would be better, in my opinion, because they were the original part. The 47s should work perfectly well.

bdgf2004 · 8th May 2011, 09:00 PM

i got the power supply going but when i attempt to power it up it pulses on and off. i noticed the large caps C241 & C271 (200v 33uf non-polar) and c61 & C64 (80wv 4700uf) were buldging a bit but not vented. i removed and checked them, the 33uf caps measured 1 @ 32uf & the other @ 22uf and both the 4700uf caps were @ 4100uf. also i was checking the outputs and the 9640's all measured @ .800v (red probe on drain and the black on source) with diode check and 1.5m ohms on resistance. is that ok? i ask because i have new 1's on hand and they measure @ .500v & 2.5m ohms (that's what i usaully get).
was the 4100uf reading ok? the caps were at room temp when measured
also i was having trouble finding some of the 200v 33uf non-polar caps.

9th April 2011, 04:21 PM	#1
bdgf2004 diyAudio Member Join Date: Oct 2010	Memphis 16-mcd1000 The power supply was blown when I received this amp. I got the 3205 fets but it uses 2sa1266/2sc3198 for the emitter follower pair. I was wandering if there was a good replacement for those?

9th April 2011, 05:06 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There are many options. If you're trying to use something you have on hand, list ALL of the PNP transistors you have. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th April 2011, 06:47 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Of those, I'd use the KSA1220. This is to replace the 1266. They don't use NPN drivers as far as I know. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th April 2011, 09:49 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Probably not. I'd suggest that you use 47 ohm resistors. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th April 2011, 10:10 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I should have looked at the photos I have. The originals are 22 ohms and would be better, in my opinion, because they were the original part. The 47s should work perfectly well. __________________ 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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9th April 2011, 06:33 PM	#3
bdgf2004 diyAudio Member Join Date: Oct 2010	2n4403, mpsa56, mpsw56, 2n3906, mpsw92, ksa1220a, 2n5087

9th April 2011, 07:01 PM	#5
bdgf2004 diyAudio Member Join Date: Oct 2010	thanks. i haven't even pulled the board yet to really check it out. i just saw 1 that was completely destroyed and others in the area so i read all the #'s i could see. thank you. 1 day i will have confidence to choose my own replacements.

9th April 2011, 08:10 PM	#6
bdgf2004 diyAudio Member Join Date: Oct 2010	would 91 ohm work for the gate resistors? 3205's

9th April 2011, 09:50 PM	#8
bdgf2004 diyAudio Member Join Date: Oct 2010	i can make out the first line on 1 of the resistors and it appears to be red. so i figured that it was probably 2? ohm and all i had was a 20 and a 47. in the tutorial perry suggested 27-47 ohm so i am going to try the 47 ohm and see what happens.

8th May 2011, 09:00 PM	#10
bdgf2004 diyAudio Member Join Date: Oct 2010	i got the power supply going but when i attempt to power it up it pulses on and off. i noticed the large caps C241 & C271 (200v 33uf non-polar) and c61 & C64 (80wv 4700uf) were buldging a bit but not vented. i removed and checked them, the 33uf caps measured 1 @ 32uf & the other @ 22uf and both the 4700uf caps were @ 4100uf. also i was checking the outputs and the 9640's all measured @ .800v (red probe on drain and the black on source) with diode check and 1.5m ohms on resistance. is that ok? i ask because i have new 1's on hand and they measure @ .500v & 2.5m ohms (that's what i usaully get). was the 4100uf reading ok? the caps were at room temp when measured also i was having trouble finding some of the 200v 33uf non-polar caps.

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