PPI Car Amplifier Repair

jschen · 31st May 2004, 10:24 PM

Hello I'm trying to repair my PPI A600 amplifier. There is some noise on my right channel that I'm trying to eliminate and replacing the transistors for the channel. I trying to figure out what to replace A1011/C2344 transistors since I can't find parts for them. I have some MCM 2N6490/2N6487 transistors if that will work? Also there are some diodes in to to-129 format on each channel and wasn't sure if I should replace those too. I inspected the other parts and they don't seem to have ay problems. Thanks

K-amps · 1st June 2004, 03:31 PM

I though MCM had the 1011/2344. if not, try www.matchaknob.com.

cheers!

K-

Immo_G · 1st June 2004, 03:49 PM

Maybe delete this and try in car audio section?

jschen · 1st June 2004, 03:53 PM

Thanks I got it. I needed to search with '2S' in front of the part #.

Eva · 1st June 2004, 04:09 PM

2SA1011/2SC2344 appear to be 160V 1.5A hfe=100 Ft=100Mhz devices from Sanyo

Since I feel Sanyo stuff is hard to find everywhere [maybe even in Japan?

, not to talk about trying to get Sanyo IC datasheets

], I think that some valid replacements could be Toshiba 2SA1930/2SC5171 or On-Semi[Motorola] MJE15030/MJE15031

The latter On-Semi devices have somewhat different specifications than Sanyos but I'm sure they are much easier to find in USA

jschen · 2nd June 2004, 06:29 PM

I've replaced most of the transistors on the channel but am still getting the "hiss" noise. I'm reading about 1 volt DC on the output of that channel which doesn't seem normal.

What could be the culprit?

K-amps · 2nd June 2004, 07:54 PM

Does it have any IC's in the input? Check those and the bypass caps on the IC.

31st May 2004, 10:24 PM	#1
jschen diyAudio Member Join Date: Apr 2004 Location: US	PPI Car Amplifier Repair Hello I'm trying to repair my PPI A600 amplifier. There is some noise on my right channel that I'm trying to eliminate and replacing the transistors for the channel. I trying to figure out what to replace A1011/C2344 transistors since I can't find parts for them. I have some MCM 2N6490/2N6487 transistors if that will work? Also there are some diodes in to to-129 format on each channel and wasn't sure if I should replace those too. I inspected the other parts and they don't seem to have ay problems. Thanks

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1st June 2004, 03:31 PM	#2
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	I though MCM had the 1011/2344. if not, try www.matchaknob.com. cheers! K-

1st June 2004, 03:49 PM	#3
Immo_G diyAudio Member Join Date: Sep 2003 Location: Vic, Au	Maybe delete this and try in car audio section?

1st June 2004, 03:53 PM	#4
jschen diyAudio Member Join Date: Apr 2004 Location: US	Thanks I got it. I needed to search with '2S' in front of the part #.

1st June 2004, 04:09 PM	#5
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	2SA1011/2SC2344 appear to be 160V 1.5A hfe=100 Ft=100Mhz devices from Sanyo Since I feel Sanyo stuff is hard to find everywhere [maybe even in Japan? , not to talk about trying to get Sanyo IC datasheets ], I think that some valid replacements could be Toshiba 2SA1930/2SC5171 or On-Semi[Motorola] MJE15030/MJE15031 The latter On-Semi devices have somewhat different specifications than Sanyos but I'm sure they are much easier to find in USA

2nd June 2004, 06:29 PM	#6
jschen diyAudio Member Join Date: Apr 2004 Location: US	I've replaced most of the transistors on the channel but am still getting the "hiss" noise. I'm reading about 1 volt DC on the output of that channel which doesn't seem normal. What could be the culprit?

2nd June 2004, 07:54 PM	#7
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Does it have any IC's in the input? Check those and the bypass caps on the IC.

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