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Are there any markings that tell the gain of the part that you can read? Those two transistors simply have “A” printed on them – I’m assuming they are 2sa Since this board has been messed with so much, I pulled the power amp from another KR I have that is unmolested, and listed here what is actually installed on the board.
There are some odd things on your list. The other one has the wrong pin out. SoundOfSoundJan 11, Share This Page Tweet. I can order the caps myself, but need some help with the transistors. No, create an account now. I really appreciate your taking the time to help me with this. Your name or email address: A previous owner has butchered this thing badly picture attached with all sorts of oddball replacements and beautiful soldering, so I would like to start over.
Log in or Sign up. I bought a rather hacked KR with blown outputs on the left channel. Do you already have an account? Have also attached a scan of the power amp schematic.
I have spent a fair amount of time searching the forum for subs, but am hoping someone can look over my list and point out errors, make better recommendations, or datasheeet otherwise. This package is a TO and the other one has a TO As you can tell I’m new to this.
You have Qe 7,8 as 2sa but on the schematic it says 2sa WB. Yea GR it looks like.
2SA872 PNP Low Frequency Transistor (Pack of 5)
Thank you very much for any help on this! Are those Qe the drivers? Qe 2sa are your differential pairs. Curious what you think about my selection on those. I asked a question about the outputs earlier today. Yeah, that’s a reason I I’m looking at the other board.
Can you determine if Qe 7,8 have the collector or the base at the center pin. The a also says “GR 5K”. You must log in or sign up to reply here. I was wondering if someone would bring that up.
You need the collector in the center. What part is on the messed up board? I’m also hoping someone can point out which are the differential pairs so that I can order a bunch of them to match them up.
Do you see any gain numbers on any of those parts? Yes, my password is: Am i correct in assuming “2s” should be in front of those?
I would like to replace all of the transistors on the power amp board. I’m getting conflicting information about a replacement.
Per datasheets available online they are both center collector 2sa http: 2as872 the board I’m working on, Qe7 says a and Qe8 says a and both are very obvious poorly done replacements. Discussion in ‘ DIY ‘ started by gort69Jan 11, Yes, 2s There are replacements but you have to be sure if the center is a base or a collector.
2SA 데이터시트(PDF) – Hitachi Semiconductor
You want to use the complementary pairs listed on the datasheet. Here are the datasheets for the outputs. Is a TO bigger than a TO? I don’t feel very confident about my sub for Qe19,20 – there is no datasheet available. My understanding is that Kenwood and likely others used what they datashret get their hands on at the time.