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Old 31st May 2004, 10:24 PM   #1
jschen is offline jschen  United States
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Default 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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Old 1st June 2004, 03:31 PM   #2
K-amps is offline K-amps  United States
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I though MCM had the 1011/2344. if not, try www.matchaknob.com.

cheers!

K-
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Old 1st June 2004, 03:49 PM   #3
Immo_G is offline Immo_G  Australia
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Maybe delete this and try in car audio section?
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Old 1st June 2004, 03:53 PM   #4
jschen is offline jschen  United States
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Thanks I got it. I needed to search with '2S' in front of the part #.
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Old 1st June 2004, 04:09 PM   #5
Eva is offline Eva  Spain
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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
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Old 2nd June 2004, 06:29 PM   #6
jschen is offline jschen  United States
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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?
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Old 2nd June 2004, 07:54 PM   #7
K-amps is offline K-amps  United States
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Does it have any IC's in the input? Check those and the bypass caps on the IC.
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