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You want to use the complementary pairs listed on the datasheet. What part is on the messed up board? I’m getting conflicting information about a replacement. Can datxsheet determine if Qe 7,8 have the collector or the base at the center pin.
2SA Datasheet(PDF) – Hitachi Semiconductor
As you can tell I’m new to this. Yes, 2s There are replacements but you have to be sure if the center is a base or a collector. Am i correct in assuming “2s” should be in front of those? I asked a question about the outputs earlier today.
2SA872 PNP Low Frequency Transistor (Pack of 5)
This package is a TO and the other one has a TO 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. Do you see any gain numbers on any of those parts? There are some odd things on your list. 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 comment otherwise.
Those two transistors simply have “A” printed on them – I’m assuming they are 2sa Are there any markings that tell the gain of the part that you can read?
Lots of room for those. I was wondering if someone would bring that up. Yes, my password is: Are those Qe the drivers? Qe 2sa are your differential pairs.
I bought a rather hacked KR with blown outputs on the left channel. Is a TO bigger than a TO? Here are the datasheets for the outputs. SoundOfSoundJan 11, Share This Page Tweet.
Yeah, that’s a reason I I’m looking at the other board. Curious what you think about my selection on those. Have also attached a scan of the power amp schematic. Per datasheets available online they are both center collector 2sa http: You need the collector in the center. 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. The a also says “GR 5K”.
Do you already have an account? The 2ss872 also says “5E C4”. Thank you very much for any help on this! On the board I’m working on, Qe7 says a dagasheet Qe8 says a and both are very obvious poorly done replacements.
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. I would like to replace all of the transistors on the power amp board. No, create an account now. You must log in or sign up to reply here. Log in or Sign up. You have Qe 7,8 as 2sa dxtasheet on the schematic it says 2sa WB.
2SA datasheet & applicatoin notes – Datasheet Archive
I really appreciate your taking the time to help me with this. I can order the 2a872 myself, but need some help with the transistors. My understanding is that Kenwood and likely others used what they could get their hands on at the time.
The other one has the wrong pin out. Discussion in ‘ DIY ‘ started by gort69Jan 11, Yea GR it looks like. I don’t feel very confident about my sub for Qe19,20 – there is no datasheet available. Your name or email address: