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SoundOfSoundJan 11, 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. 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.

Here are the datasheets for the outputs. I bought a rather hacked KR with blown outputs on the left channel. I don’t feel very confident about my sub for Qe19,20 – there is no datasheet daatsheet. Per datasheets available online they are both center collector 2sa http: I can order xatasheet caps myself, but need some help with the transistors.

Yes, 2s There are replacements but you have to be sure if the center is a base or a collector. As you dxtasheet tell I’m new to this. Can you determine if Qe 7,8 have the collector or the base at the center pin. 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.

  ASTM D3167 PDF

There are some odd things on your list. On the board I’m working on, Qe7 says a and Qe8 says a and both are very obvious poorly done replacements. My understanding is that Kenwood and likely others used what they could get their hands on at the time.

I’m getting conflicting information about a replacement. No, create an account now. Log in or Sign up. This package is a TO and the other one has a TO I was wondering if someone would bring that up. You must log in or sign up to reply here.

2SA872 – 2SA872 PNP Low Frequency Transistor

Datasgeet you very much for any help on this! You want to use the complementary pairs listed on the datasheet. Do you already have an account?

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.

Share This Page Tweet. I really appreciate your taking the time to help me with this.

(PDF) A872 Datasheet download

I would like to replace all of the transistors on the power amp board. Are there any markings that tell the gain of the part that you can read?


The other one has the wrong pin out. Are those Qe the drivers? Have also attached a scan of the power amp schematic.

2SA Hitachi Silicon PNP Epitaxial amplifier ChipFind Datasheet Archive |

The a also says “GR 5K”. I asked a question about datashest outputs earlier today. Am i correct in assuming “2s” should be in front of those? The a also says “5E C4”. You need the collector in the center. You have Qe 7,8 as 2sa but on the schematic it says 2sa WB.

Yeah, that’s a reason I I’m looking at the other board. Lots of room for those. Your name or email address: Do you see any gain numbers on any datasheeet those parts? What part is on the messed up board? Yes, my password is: Qe 2sa are your differential pairs.

Discussion in ‘ DIY ‘ started by gort69Jan 11, Yea GR it looks like.

Curious what you think about my selection on those. Is a TO bigger than a TO? Those two transistors simply have “A” printed on them – I’m assuming they are 2sa