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Realistic STA2100D replacement transistors

7

72TeleDeluxe

New Member
Hello all, I've been a lurker here for a few weeks and have enjoyed the great info and discussions. I am new to the hobby/addiction of vintage audio. I have begun to put together a system starting with B&W DM110 speakers. I have a working Pioneer sx650 that I picked up cheap and my brother in law is donating a technics sl1300 tt. I have also aquired a Realistic sta2100D which is not working. It is going to need new output transistors on the right channel as well as a few resistors and smaller transistors that are bad. I was wondering if anyone has found suitable replacements for the original Hitachi output transistors. I have not had much luck with google. I also have a Harmon Kardon 800+ with similar issues. Once I have them all working I will audition them all and the winner will stay in my living room. 2nd place will be the heart of the garage system. Thanks in advance for any help.
 
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Google "Realistic STA-2100D audiokarma" Lots of stuff.

Replaced the outputs: 2SB665/2SD675 with MJ21193G/94G's
Replaced the drivers: 2SD669/2SB649 with MJE15032/MJE15033
Replaced the VD1221 diodes with a pair of series'd 1N4148 diodes
Replaced the 2SA872's with KSA992's.
Replaced the 2SA659/2SC1175 with KSA1013/ KSC2383's
Replaced the 13v zener D509A

The compensating transistor 2SD400 should be replaced found at BDent.

REALISTIC STA-2100D

NOTES:
ALL TANTALUM CAPS ARE REPLACED WITH PANASONIC ECQ-V STACKED
NP (NON POLARIZED) REPLACED WITH SILMIC MUSE
“AB” LISTED CAPS ARE FOR BOTH RIGH AND LEFT SIDES SO ORDER “TWO”
Some of the ECQ Film caps are discontinued, there are suitable replacements.


EQ/PRE AMP BOARD:
C301AB 2.2u 25V TANTLUM 667-ECQ-V1H225JL
C303AB 47u 25V EL 647-UPW1E470MDD
C304AB 22u 16V EL 555-RFS16V220ME3#5
C308AB 100u 25V EL 555-RFS25V101MH4#5
C312AB 1u 25V NP 647-UES1H010MDM
C315 220u 25V EL 647-UTT1E221MPD
C316 220u 25v EL 647-UTT1E221MPD

PHONO/TONE AMP:
C401AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C402AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C410AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C412AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C413AB 1u 50V EL 667-ECQ-V1H105JL
C416AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C418AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C419AB 1u 50V EL 667-ECQ-V1H105JL
C423AB 4.7u 25V NP 647-UES1E4R7MDM
C425 330u 25V EL 647-UPS1E331MPD
C426 330u 25V EL 647-UPS1E331MPD
C427AB 100u 25V EL 647-UPJ1E101MED


MAIN AMP’S
C502AB 4.7u 50V NP 647-UES1H4R7MEM
C503AB 220u 16V EL 647-UPJ1C221MPD
C504AB 220u 16V EL 647-UPJ1C221MPD
C506AB 100u 80V EL 647-UPM1K101MHD6
C507AB 100u 80V EL 647-UPM1K101MHD6
C510AB 100u 16V EL 647-UPM1C101MED
C511AB 100u 16V EL 647-UPM1C101ME

PROECTION BOARD:
C601 220u 16V EL 647-UPJ1C221MPD
C602 330u 16V EL 647-UHD1C331MPD
C603 330u 16V EL 647-UHD1C331MPD
C604 47u 50V EL 647-UPS1H470MED
C605 47u 50V EL 647-UPS1H470MED


POWER SUPPLY:
C705 220u 35V EL 647-UPW1V221MPD
C706 220u 35V EL 647-UPW1V221MPD
C707 220u 35V EL 647-UPW1V221MPD
C708 220u 35V EL 647-UPW1V221MPD
C709 47u 35V EL 647-UPW1V470MED
C710 47u 35V EL 647-UPW1V470MED
C711 220u 35V EL 647-UPW1V221MPD
C712 220u 35V EL 647-UPW1V221MPD
C713 220u 35V EL 647-UPW1V221MPD
C714 220u 35V EL 647-UPW1V221MPD
C716 470u 35V EL 647-UPW1V471MPD
C717 100u 25V EL 647-UPW1E101MED
C719 330u 16V EL 647-UHD1C331MPD
C720 470u 16V EL 647-UPJ1C471MPD6
C721 1000u 16V EL 647-UPW1C102MPD
C724 220u 35V EL 647-UPW1V221MPD
C725 220u 35V EL 647-UPW1V221MPD
C727 470u 25V EL 647-UPW1E471MPD

C1001AB 0.47u 50V EL 667-ECQ-V1H474JL
C1003AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C1004 100u 25V EL 647-UPW1E101MED
C1005 100u 25V EL 647-UPW1E101MED

FM/IF DOLBY BOARD:
C215 10uf 16V EL 555-RFS16V100ME3#5
C217 .47UF 50V FILM 667-ECQ-V1H474JL
C218 1UF 50V FILM 667-ECQ-V1H105JL
C221 1UF 50V FILM 667-ECQ-V1H105JL
C225 100UF 16V EL 667-EEU-FM1E101
C226 47UF 16V EL 667-EEU-FM1E470
C227 10UF 16V EL 555-RFS16V100ME3#5
C228 10UF 16V EL 555-RFS16V100ME3#5
C232 100UF 16V EL 667-EEU-FM1E221
C236 .22UF 25V TANT 667-ECQ-V1H224JL3
C237 .47UF 25V TANT 667-ECQ-V1H474JL
C247 100UF 16V EL 667-EEU-FM1E101
C251 47UF 50V EL 667-EEU-FC1H470
C253 100UF 16V EL 667-EEU-FM1E101
C256 47UF 25V TANT 667-ECQ-V1H474JL
C258 47UF 25V TANT 667-ECQ-V1H474JL
C260 .1UF 25V TANT 667-ECQ-V1H223JL3
C262 3.3UF 25V EL 647-UPW1H3R3MDD
C264 4.7UF 25V EL 647-UPW1E4R7MDD
C266 220UF 16V EL 667-EEU-FM1E221

C1201 1u 50V EL RFS50V010ME3#5
C1202 1u 50V EL RFS50V010ME3#5
C1205 10u 16V EL RFS16V100ME3#5
C1206 10u 16V EL RFS16V100ME3#5
C1215 10u 16V EL RFS16V100ME3#5
C1216 10u 16V EL RFS16V100ME3#5
C1219 10u 16V EL RFS16V100ME3#5
C1220 10u 16V EL RFS16V100ME3#5
C1223 10u 16V EL RFS16V100ME3#5
C1224 10u 16V EL RFS16V100ME3#5
C1229 220u 16V EL 667-EEU-FM1E221
C1230 220u 16V EL 667-EEU-FM1E221
C1231 10u 16V EL 555-RFS16V100ME3#5
C1232 10u 16V EL 555-RFS16V100ME3#5
C1233 220u 16V EL 667-EEU-FM1E221

LARGE POWER SUPPLY FILTER CAPS:
C1405 15000u 71V EL 565-3331-ND FILTER CAPS Digikey
C1406 15000u 71V EL 565-3331-ND FILTER CAPS Digikey

RELAY BOARD:
C1501 .1UF 25V FILM 667-ECQ-V1H104JL
C1502 47u 10V EL 647-UPS1A470MDD
C1503 100u 35V EL 647-UPM1V101MPD
C1301 100u 35V EL 647-UPM1V101MPD
C1302 16u 35V EL 647-UPW1V180MDD 18uf 35volts
 
Last edited:
The most-common (cheap, available, lots of experience with) transistor that meets or exceeds those parameters and is in a compatible package (TO-126 or TO-220) looks like the KSC3503D. It's $0.47 each.
 
Raccoon1400 said:
The KSC2690/KSA1220 has a lower current rating than the 2SD669/compliment.
Click to expand...

Reviewing the transistors available at Mouser, it looks like the MJE15032/MJE15033 pair would be a better, much-beefier replacement for the 2SD669/2SB649 originals. Just my $0.02
 
The list I posted is old but its works and I agree the MJE15032/MJE15033 would fit better than the 2SD669/2SB649. The MJE's are quite a bit more transistor, but should give it some reliability. They should fit on the original heatsinks.
May be something like this from Mouser could improve the cooling capability.
I made the correction to the list posted.
The compensation transistor that is mounted to the heatsink should be replaced as a matter of practice. You can still find the 2SD400's at BDent.
The STA 2100 is a wonderful receiver to work on and sounds fantastic when completed.
 
If you haven't done this before it's best to do one board at a time. Power up on the DBT and recheck the set for operation. Then move to the next board.
 
Thanks. I have poked under the hood of a few basic units. This one is a little more complex so I will be taking it slow.
 
This is timely. I'm looking to have mine fully restored in six months or so once my Marantz comes back. Just need to find someone who isn't booked out. :crazy:
 
Left amp. board is done. Caps and transistors. Run a few tests on it and then start on the right. The right amp board was working correctly before disassembley.My question is, should I replace the transistors as well as the capacitors? The old add adage .don't fix what's not, broken might apply. Or is it better to replace everything similar to the left amp board.
 
If the right channel was working, leave it alone. Maybe replace electrolytic caps and bias trimmers.
 
Thx. All the caps are replaced. Everything else checks out. All new transistors in the left amp only. All the right ones check ok. Might replace the zener diodes in the left as well.
 
Hi folks. Super glad to find this thread. I'm a big fan of the 78-80s era realistic high end audio gear. I went through and read all 150+ pages of the MachOne thread about the MachOne mods, heavily contributed to by VideoLady201. I did all those mods to my MachOne's and they are awesome. I built myself a matched system around those speakers once they were complete, including the incredible STA-2100D. Lately, the amp has been showing its age. It sputters and the relay clicks on and off when it starts up. One of the phono inputs is only picking up sound on one channel. Sometimes on other inputs the sound will go in and out on the right side and volume will jump sharply. All of this, I'm pretty confident, is a result of the caps drying out. Now, I'm not shy about projects, but if I dug into the 2100, it would be my first major recap project and I am a little cautious about attempting it without having all my plans laid out carefully and parts ordered to be sure I've got everything I need. So, this thread is super helpful. I guess I'm going to have to invest in a Hakko 808 or equivalent with all the desoldering that I'll be doing.
In addition to the caps and the transistor replacement, what other upgrades/mods/replacements should I plan on doing, if I'm going to be thorough, while I'm in there and have things taken apart? I want to do a proper job, as close to a professional job as I can, but not having done it before, I'm not sure what all the steps are that would be needed. I saw on a youtube video about defluxing the boards, and do some people change out the terminal posts? Diode swap? I'm compiling my master list of what I should do and order, so any and all help would be great. I will create/post and share a google doc with this info, similar to what I did with the MachOne project. https://docs.google.com/document/d/1QQhzoCaSh0JKl9XvAZqtelCmoZ525HLjen45JXJCn3o/edit?usp=sharing Thanks to all in advance for your help.
 
zebulon1 said:
Replaced the drivers: 2SD669/2SB649 with MJE15032/MJE15033
Click to expand...

I know it's an old thread, but I don't see this addressed anywhere. As the pinouts are reversed on the MJE15032/MJE15033 from the 2SD669/2SB649, did you just flip the heat sink around and cover the jumper that sits in front of where the original was?
 
How would I go about finding one of these parts? Specifically this one: C1502 47u 10V EL 647-UPS1A470MDD ?? My resistor started smoking when I tried powering the system on :(

zebulon1 said:
Google "Realistic STA-2100D audiokarma" Lots of stuff.

Replaced the outputs: 2SB665/2SD675 with MJ21193G/94G's
Replaced the drivers: 2SD669/2SB649 with MJE15032/MJE15033
Replaced the VD1221 diodes with a pair of series'd 1N4148 diodes
Replaced the 2SA872's with KSA992's.
Replaced the 2SA659/2SC1175 with KSA1013/ KSC2383's
Replaced the 13v zener D509A

The compensating transistor 2SD400 should be replaced found at BDent.

REALISTIC STA-2100D

NOTES:
ALL TANTALUM CAPS ARE REPLACED WITH PANASONIC ECQ-V STACKED
NP (NON POLARIZED) REPLACED WITH SILMIC MUSE
“AB” LISTED CAPS ARE FOR BOTH RIGH AND LEFT SIDES SO ORDER “TWO”
Some of the ECQ Film caps are discontinued, there are suitable replacements.


EQ/PRE AMP BOARD:
C301AB 2.2u 25V TANTLUM 667-ECQ-V1H225JL
C303AB 47u 25V EL 647-UPW1E470MDD
C304AB 22u 16V EL 555-RFS16V220ME3#5
C308AB 100u 25V EL 555-RFS25V101MH4#5
C312AB 1u 25V NP 647-UES1H010MDM
C315 220u 25V EL 647-UTT1E221MPD
C316 220u 25v EL 647-UTT1E221MPD

PHONO/TONE AMP:
C401AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C402AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C410AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C412AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C413AB 1u 50V EL 667-ECQ-V1H105JL
C416AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C418AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C419AB 1u 50V EL 667-ECQ-V1H105JL
C423AB 4.7u 25V NP 647-UES1E4R7MDM
C425 330u 25V EL 647-UPS1E331MPD
C426 330u 25V EL 647-UPS1E331MPD
C427AB 100u 25V EL 647-UPJ1E101MED


MAIN AMP’S
C502AB 4.7u 50V NP 647-UES1H4R7MEM
C503AB 220u 16V EL 647-UPJ1C221MPD
C504AB 220u 16V EL 647-UPJ1C221MPD
C506AB 100u 80V EL 647-UPM1K101MHD6
C507AB 100u 80V EL 647-UPM1K101MHD6
C510AB 100u 16V EL 647-UPM1C101MED
C511AB 100u 16V EL 647-UPM1C101ME

PROECTION BOARD:
C601 220u 16V EL 647-UPJ1C221MPD
C602 330u 16V EL 647-UHD1C331MPD
C603 330u 16V EL 647-UHD1C331MPD
C604 47u 50V EL 647-UPS1H470MED
C605 47u 50V EL 647-UPS1H470MED


POWER SUPPLY:
C705 220u 35V EL 647-UPW1V221MPD
C706 220u 35V EL 647-UPW1V221MPD
C707 220u 35V EL 647-UPW1V221MPD
C708 220u 35V EL 647-UPW1V221MPD
C709 47u 35V EL 647-UPW1V470MED
C710 47u 35V EL 647-UPW1V470MED
C711 220u 35V EL 647-UPW1V221MPD
C712 220u 35V EL 647-UPW1V221MPD
C713 220u 35V EL 647-UPW1V221MPD
C714 220u 35V EL 647-UPW1V221MPD
C716 470u 35V EL 647-UPW1V471MPD
C717 100u 25V EL 647-UPW1E101MED
C719 330u 16V EL 647-UHD1C331MPD
C720 470u 16V EL 647-UPJ1C471MPD6
C721 1000u 16V EL 647-UPW1C102MPD
C724 220u 35V EL 647-UPW1V221MPD
C725 220u 35V EL 647-UPW1V221MPD
C727 470u 25V EL 647-UPW1E471MPD

C1001AB 0.47u 50V EL 667-ECQ-V1H474JL
C1003AB 4.7u 50V EL 647-UKL1H4R7MDD1AA
C1004 100u 25V EL 647-UPW1E101MED
C1005 100u 25V EL 647-UPW1E101MED

FM/IF DOLBY BOARD:
C215 10uf 16V EL 555-RFS16V100ME3#5
C217 .47UF 50V FILM 667-ECQ-V1H474JL
C218 1UF 50V FILM 667-ECQ-V1H105JL
C221 1UF 50V FILM 667-ECQ-V1H105JL
C225 100UF 16V EL 667-EEU-FM1E101
C226 47UF 16V EL 667-EEU-FM1E470
C227 10UF 16V EL 555-RFS16V100ME3#5
C228 10UF 16V EL 555-RFS16V100ME3#5
C232 100UF 16V EL 667-EEU-FM1E221
C236 .22UF 25V TANT 667-ECQ-V1H224JL3
C237 .47UF 25V TANT 667-ECQ-V1H474JL
C247 100UF 16V EL 667-EEU-FM1E101
C251 47UF 50V EL 667-EEU-FC1H470
C253 100UF 16V EL 667-EEU-FM1E101
C256 47UF 25V TANT 667-ECQ-V1H474JL
C258 47UF 25V TANT 667-ECQ-V1H474JL
C260 .1UF 25V TANT 667-ECQ-V1H223JL3
C262 3.3UF 25V EL 647-UPW1H3R3MDD
C264 4.7UF 25V EL 647-UPW1E4R7MDD
C266 220UF 16V EL 667-EEU-FM1E221

C1201 1u 50V EL RFS50V010ME3#5
C1202 1u 50V EL RFS50V010ME3#5
C1205 10u 16V EL RFS16V100ME3#5
C1206 10u 16V EL RFS16V100ME3#5
C1215 10u 16V EL RFS16V100ME3#5
C1216 10u 16V EL RFS16V100ME3#5
C1219 10u 16V EL RFS16V100ME3#5
C1220 10u 16V EL RFS16V100ME3#5
C1223 10u 16V EL RFS16V100ME3#5
C1224 10u 16V EL RFS16V100ME3#5
C1229 220u 16V EL 667-EEU-FM1E221
C1230 220u 16V EL 667-EEU-FM1E221
C1231 10u 16V EL 555-RFS16V100ME3#5
C1232 10u 16V EL 555-RFS16V100ME3#5
C1233 220u 16V EL 667-EEU-FM1E221

LARGE POWER SUPPLY FILTER CAPS:
C1405 15000u 71V EL 565-3331-ND FILTER CAPS Digikey
C1406 15000u 71V EL 565-3331-ND FILTER CAPS Digikey

RELAY BOARD:
C1501 .1UF 25V FILM 667-ECQ-V1H104JL
C1502 47u 10V EL 647-UPS1A470MDD
C1503 100u 35V EL 647-UPM1V101MPD
C1301 100u 35V EL 647-UPM1V101MPD
C1302 16u 35V EL 647-UPW1V180MDD 18uf 35volts
Click to expand...
 
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