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Quick question about a transistor sub

Rubber Ducky

Rubber Ducky

Member
I'm about to replace the transistors on the tone board of a 2226b, and I'm shopping for replacements for the 8 transistors on the board. In place of the 2SC1681 I'm going to use KSC1845's that I've found at Digikey. For the 2SA841's I'm going to use KSA992, but Digikey shows 3 choices for these and I'm not sure which is best for this application, or if it even makes a difference. The 3 are:

KSA992FTA
KSA992FAT
KSA992FBTA

The only difference in specs that stand out to me is the hFE min spec of 300mA for the FTA, where the other two are spec'd at 200mA.

I'm a complete newbie at this and I know little about transistors except how to solder them in place. Anyone have a recommendation as to which to go with? I don't know what the specs of the original 2SA841 was.

edit: I should add that the KSC1845's at Digikey are the KSC1845FTA. Should the KSA's be the same?
 
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I went ahead and ordered the KSC1845FTA/KSA992FTA pairs, since they had the same gain of 300mA. Just let me know if I screwed up I guess.
 
petes'picks said:
Saw somewhere where the 2SC1681 were replaced with KSA1845FBU. Also here is a thread incase you havent seen it yet. https://audiokarma.org/forums/index...-is-the-phono-section-in-your-marantz.359834/

Be sure to verify pinouts before soldering. Sometimes they go in the same, sometimes backwards, sometimes you have to bend the leads to rearrange the pinouts.
Click to expand...

Good advice, I'll pay close attention to the pin configuration. Yeah, I saw a thread where the FBU was recommended as a replacement, but I don't really know what the differences are. I first searched Digikey for the FBU but didn't find any.
 
Rubber Ducky said:
KSA992FTA
KSA992FAT
KSA992FBTA
Click to expand...
KSA992FTA F rank ... 300-600 Hfe , TA --ammo tape
KSA992FAT FA rank 300 - 470 Hfe , T-- ammo tape
KSA992FBTA FB rank 430-600 Hfe , TA --ammo tape

I'd go with FB,s or FA's
 
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LOL, I figured it might be something like that. Too late! I ordered the FTA's. I only needed 4. Even with the caps I ordered, the shipping was half of the total order.
 
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