Yet another SX-1050 recap/restoration. What am I forgetting?

eentegra

New Member
Well I think its time to recap the ole SX-1050. I have perused through many threads on this topics but i want a second opinion as always. You guys are experts in my book. I just don't want to make a mistake that somebody else had made. I do have soldering background. I am familiar with electronics. I have the service manual as well. So here are some background and questions i have on the unit under test.

- Looks like somebody else had gone in and changed some caps on some boards from stock to Nippon ChemiCons. I’ll change them anyway.
- DBT is done and have been tested and is working properly.
- On the power amp board. Do I need to remove the rear panel? Looks like im going to have to move this board around to get to pwr board A.
- Are the power amp transistors only ones with micas?
- How difficult is it to remove/work on pwr supply B? it’s buried in there
- I do notice a static-ish pop on the 5-second delay turning on. Hoping to resolve this after a recap and driver swap (Q6,Q7).
- I dont plan on recapping the tuner right now.
- I’ll work in this order: protection, pwr a, pwr b, then pwr amp. Once I get that going, then I’ll plan on the eq, filter, flat and control. After each board I’ll test with DBT to verify.
- Thermal grease application on trans being replaced. I’ll be using GC silicone type.
- I will not change the 2 filter caps as they look good. Nippon ChemiCon types. Again may have been changed previously.
- I am only planning to change some transistors and not all. Good idea?

Here is the parts list,with spares, I plan on ordering (gathered from previous MTF threads):
source
http://www.audiokarma.org/forums/showthread.php?t=342822
http://www.audiokarma.org/forums/showthread.php?t=640549

Mouser
Mfr Value Volts Qty Spares Ref Part No
Protect
470 6 2 3 C3,C4 647-UPW1A471MPD
2.2 50 1 2 C5 647-UPW1H2R2MDD
47 50 1 2 C6 647-UPW1H470MED
0.22 25 2 3 C1 C2 598-DSF050J224
2SC945A 1 5 Q6 512-KSC2383YTA
2SC1384 1 2 Q7 512-KSC2690AYS

A 220 80 2 3 C1 C9 647-UPW2A221MHD
47 16 2 3 C3 C12 647-UPW1V470MED
47 35 2 3 C6 C14 647-UPW1V470MED
10 35 1 2 C7 647-UPW1H100MDD
1 50 1 2 C8 647-UPW1H010MDD
100 35 1 2 C15 647-UPW1V101MPD
220 25 1 2 C16 647-UPW1E221MPD
47 10 2 3 C17 C22 647-UPW1V470MED
100 25 1 2 C20 647-UPW1V101MPD
220 16 1 2 C24 647-UPW1E221MPD
2.2 50 1 2 C23 647-UPW1H2R2MDD
2SB507P 1 2 Q5 512-KSA940TU
2SD325R 1 3 Q9 512-ksc2073TU

Surge 10 63 1 2 C1 647-UPJ2A100MED

B 470 80 2 3 C9 C10 647-UPW2A471MHD
2200 25 1 2 C11 647-UPW1V222MHD

AMP 0.68 25 2 4 C1 C2 ECQ-V1H684JL
10 16 2 3 C5 C6 647-UPW1H100MDD
470 6 4 5 C25:28 647-UPW1A471MPD
2SD381A 2 3 Q19 Q20 512-KSC2073TU
2SB536A 2 3 Q17 Q18 512-KSA940TU

EQ
4.7 25 2 3 C1 C2 647-UKL1E4R7KDDANA
220 35 2 3 C5 C6 647-UPW1V221MPD
220 10 2 3 C9 C10 647-UPW1E221MPD
33 35 2 3 C17 C18 647-UPW1V330MDD
10 35 2 3 C21 C22 647-UKL1H100KDDANA
2SA841S 4 5 Q1:4 512-KSA992FBU
2SA726 4 5 Q1:4 "OR" 512-KSA992FBU
2SC1775A 4 5 Q5:8 512-KSC1845FTA
2SC872A 2 5 Q9:10 512-KSA992FBU

Filter 4.7 25 2 3 C3 C9 647-UKL1E4R7KDDANA
10 25 2 3 C6 C12 647-UKL1H100KDDANA
2SC1313 2 3 Q1:2 512-KSC1845FTA

Flat 1 25 4 5 C1:C4 647-UKL1H010KDDANAtd
4.7 25 2 3 C5:6 647-UKL1E4R7KDDANA
220 35 4 5 C7:8 C25:26 647-UPW1V221MPD
2.2 25 2 3 C13:14 647-UKL1H2R2KDDANA
100 10 4 5 C15:16 C23:24 647-UKL1A101KEDANA
2SA725 2 3 Q7:8 512-KSA992FBU
2SC1775A 4 5 Q1:2 512-KSC1845FTA
2SC872A 2 5 Q3:4 512-KSA992FBU

Control
4.7 25 4 5 C1:4 647-UKL1E4R7KDDANA
2.2 25 12 13 C11:14, C19:20 C27:30, C35:36
647-UKL1H2R2KDDANA
100 16 6 7 C17:18 C37:40 647-UPW1V101MPD
100 10 2 3 C33:34 647-UPW1V101MPD
10 25 2 3 C43:44 647-UKL1H100KDDANA
2SC1312 4 5 Q1:4 512-KSC1845FTA


Any other lessons learned from all of you who had done this recap/restoration? Anything I should watch out for?

Thanks in advance and i'll update this and take some before and after pics.
/Ron
 
I like this one better (Data base):
Might be a little old.

Use this Thermal paste:
THERMALCOTE I TUBE OPAQUE WHITE Mouser P/N: 532-249

Do the transistors. The old ones are junk.

Will need trimmers and relay(s) part numbers to make it complete.

Maybe "tsd71" will chime in and cough up a few part numbers.

I've done two 1050's with this list and did the tuner as well. Fantastic sounding sets and the tuner improved greatly with the recap. Much more predictable.

SX-1050:
Tuner Assembly (AWE-067)

AWE-067: C35: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWE-067: C36: 1uF 50v CEA: 647-UPW1H010MDD 1uF 50v
AWE-067: C38: 10uF 16v CEANL: 647-UKL1H100KDDANA 10uF 50v
AWE-067: C39: 47uF 16v CEANL: 647-UKL1V470KPDANA 47uF 35v
AWE-067: C40: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWE-067: C42: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWE-067: C43: 10uF 16v CEANL: 647-UKL1H100KDDANA 10uF 50v
AWE-067: C44: 10uF 16v CEANL: 647-UKL1H100KDDANA 10uF 50v
AWE-067: C47: 1uF 25v CEANL: 647-UKL1H010KDDANA 1uF 50v
AWE-067: C50: .22uF 25v CSSA: 667-ECQ-V1H224JL2 .22uF 50v
AWE-067: C51: 1uF 10v CSSA: 647-UKL1H010KDDANA 1uF 50v
AWE-067: C52: 3.3uF 10v CSSA: 647-UKL1H3R3KDDANA 3.3uF 50v
AWE-067: C54: 220uF 16v CEA: 647-UPW1V221MPD 220uF 35v
AWE-067: C59: 47uF 16v CEA: 647-UPW1V470MED 47uF 35v
AWE-067: C60: 4.7uF 25v CEA: 647-UPW1V4R7MDD 4.7uF 35v
AWE-067: C64: 10uF 16v CEA: 647-UPW1V100MDD 10uF 35v
AWE-067: C67: .1uF 25v CSSA: 667-ECQ-V1H104JL .1uF 50v
AWE-067: C70: 1uF 25v CEANL: 647-UKL1H010KDDANA 1uF 50v
AWE-067: C71: .1uF 25v CSSA: 667-ECQ-V1H104JL .1uF 50v
AWE-067: C72: .47uF 50v CEA: 667-ECQ-V1H474JL .47uF 50v

BOM list for tuner only

647-UKL1H100KDDANA | 3
647-UKL1H010KDDANA | 3
647-UKL1H4R7KDDANA | 1
667-ECQ-V1H224JL2 | 1
647-UPW1V101MPD | 2
647-UPW1H010MDD | 1
647-UPW1V221MPD | 1
647-UPW1V470MED | 1
647-UPW1V100MDD | 1
647-UKL1V470KPDANA | 1
647-UPW1V4R7MDD | 1
667-ECQ-V1H474JL | 1
647-UKL1H3R3KDDANA | 1
667-ECQ-V1H104JL | 2

Equalizer Amp Assembly (AWF-020) (“A” version has Q1-4 as 2SA726 transistors)

AWF-020: C1: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWF-020: C2: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWF-020: C5: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v
AWF-020: C6: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v
AWF-020: C9: 220uF 10v CEA: 647-UPW1C221MPD 220uF 16v
AWF-020: C10: 220uF 10v CEA: 647-UPW1C221MPD 220uF 16v
AWF-020: C17: 33uF 35v CEA: 647-UPW1V330MDD 33uF 35v
AWF-020: C18: 33uF 35v CEA: 647-UPW1V330MDD 33uF 35v
AWF-020: C21: 10uF 35v CEANL: 647-UKL1H100KDDANA 10uF 50v
AWF-020: C22: 10uF 35v CEANL: 647-UKL1H100KDDANA 10uF 50v

AWG-020: Q1: 2SA841S: 512-KSA992FBU
AWG-020: Q2: 2SA841S: 512-KSA992FBU
AWG-020: Q3: 2SA841S: 512-KSA992FBU
AWG-020: Q4: 2SA841S: 512-KSA992FBU
AWG-020: Q5: 2SC1775A: 512-KSC1845FTA
AWG-020: Q6: 2SC1775A: 512-KSC1845FTA
AWG-020: Q7: 2SC1775A: 512-KSC1845FTA
AWG-020: Q8: 2SC1775A: 512-KSC1845FTA
AWG-020: Q9: 2SA872A: 512-KSA992FBU
AWG-020: Q10: 2SA872A: 512-KSA992FBU

Function Switch Assembly (AWS-094)

AWS-094: C1: 220uF 6.3v CEA: 647-UPW1C221MPD 220uF 16v

Flat Amp Assembly (AWG-040)

AWG-040: C1: 1uF 25v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWG-040: C2: 1uF 25v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWG-040: C3: 1uF 25v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWG-040: C4: 1uF 25v CSZA: 647-UKL1H010KDDANA 1uF 50v
AWG-040: C5: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-040: C6: 4.7uF 25v CEANL: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-040: C7: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v
AWG-040: C8: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v
AWG-040: C13: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-040: C14: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-040: C15: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-040: C16: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-040: C23: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-040: C24: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-040: C25: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v
AWG-040: C26: 220uF 35v CEA: 647-UPW1V221MPD 220uF 35v

AWG-040: Q1: 2SC1775A: 512-KSC1845FTA
AWG-040: Q2: 2SC1775A: 512-KSC1845FTA
AWG-040: Q3: 2SA872A: 512-KSA992FBU
AWG-040: Q4: 2SA872A: 512-KSA992FBU
AWG-040: Q7: 2SA725: 512-KSA992FBU
AWG-040: Q8: 2SA725: 512-KSA992FBU

Control Amp Assembly (AWG-041) (“A” version has C37-40 as CEANL caps)

AWG-041: C1: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-041: C2: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-041: C3: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-041: C4: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWG-041: C11: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C12: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C13: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C14: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C17: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-041: C18: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-041: C19: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C20: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C27: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C28: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C29: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C30: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C33: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-041: C34: 100uF 10v CEANL: 647-UKL1C101KPDANA 100uF 16v
AWG-041: C35: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C36: 2.2uF 25v CEANL: 647-UKL1H2R2KDDANA 2.2uF 50v
AWG-041: C37: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWG-041: C38: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWG-041: C39: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWG-041: C40: 100uF 16v CEA: 647-UPW1V101MPD 100uF 35v
AWG-041: C43: 10uF 25v CSZA: 647-UKL1H100KDDANA 10uF 50v
AWG-041: C44: 10uF 25v CSZA: 647-UKL1H100KDDANA 10uF 50v

AWG-041: Q1: 2SC1312: 512-KSC1845FTA
AWG-041: Q2: 2SC1312: 512-KSC1845FTA
AWG-041: Q3: 2SC1312: 512-KSC1845FTA
AWG-041: Q4: 2SC1312: 512-KSC1845FTA

Filter Amp Assembly (AWM-089)

AWM-089: C3: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWM-089: C6: 10uF 25v CSZA: 647-UKL1H100KDDANA 10uF 50v
AWM-089: C9: 4.7uF 25v CSZA: 647-UKL1H4R7KDDANA 4.7uF 50v
AWM-089: C12: 10uF 25v CSZA: 647-UKL1H100KDDANA 10uF 50v

AWM-089: Q1: 2SC1313: 512-KSC1845FTA
AWM-089: Q2: 2SC1313: 512-KSC1845FTA

Power Amp Assembly (AWH-047)

AWH-047: C1: .68uF 25v CSZA: 667-ECQ-V1H684JL .68uF 50v
AWH-047: C2: .68uF 25v CSZA: 667-ECQ-V1H684JL .68uF 50v
AWH-047: C5: 10uF 16v CEA: 647-UPW1V100MDD 10uF 35v
AWH-047: C6: 10uF 16v CEA: 647-UPW1V100MDD 10uF 35v
AWH-047: C25: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v
AWH-047: C26: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v
AWH-047: C27: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v
AWH-047: C28: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v

AWH-047: Q1: 2SA750: 512-KSA992FBU
AWH-047: Q2: 2SA750: 512-KSA992FBU
AWH-047: Q3: 2SA750: 512-KSA992FBU
AWH-047: Q4: 2SA750: 512-KSA992FBU

Protection Circuit Assembly (AWM-090)

AWM-090: C1: .22uF 25v CSSA: 667-ECQ-V1H224JL2 .22uF 50v
AWM-090: C2: .22uF 25v CSSA: 667-ECQ-V1H224JL2 .22uF 50v
AWM-090: C3: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v
AWM-090: C4: 470uF 6.3v CEA: 647-UPW1A471MPD 470uF 10v
AWM-090: C5: 2.2uF 50v CEA: 647-UPW1H2R2MDD 2.2uF 50v
AWM-090: C6: 47uF 50v CEA: 667-EEU-FC1H470 47uF 50v

AWM-090: Q6: 2SC945: 512-KSD1616AGBU
AWM-090: Q7: 2SC1318: 512-KSC2690AYS

Power Supply Assembly-A (AWR-103)

AWR-103: C1: 220uF 80v CEA: 647-UHE2A221MHD 220uF 100v
AWR-103: C3: 47uF 16v CEA: 647-UPW1V470MED 47uF 35v
AWR-103: C6: 47uF 35v CEA: 647-UPW1V470MED 47uF 35v
AWR-103: C7: 10uF 35v CEA: 647-UPW1V100MDD 10uF 35v
AWR-103: C8: 1uF 50v CEA: 647-UPW1H010MDD 1uF 50v
AWR-103: C9: 220uF 80v CEA: 647-UHE2A221MHD 220uF 100v
AWR-103: C12: 47uF 16v CEA: 647-UPW1V470MED 47uF 35v
AWR-103: C14: 47uF 35v CEA: 647-UPW1V470MED 47uF 35v
AWR-103: C15: 100uF 35v CEA: 647-UPW1V101MPD 100uF 35v
AWR-103: C16: 220uF 25v CEA: 647-UPW1V221MPD 220uF 35v
AWR-103: C17: 47uF 10v CEA: 647-UPW1A470MDD6 47uF 10v
AWR-103: C20: 100uF 25v CEA: 647-UPW1V101MPD 100uF 35v
AWR-103: C22: 47uF 10v CEA: 647-UPW1A470MDD6 47uF 10v
AWR-103: C23: 2.2uF 50v CEA: 647-UPW1H2R2MDD 2.2uF 50v
AWR-103: C24: 220uF 16v CEA: 647-UPW1V221MPD 220uF 35v

AWR-103: Q1: 2SD313: 863-MJE15032G
AWR-103: Q2: 2SC869: 512-KSC2310YBU
AWR-103: Q3: 2SC869: 512-KSC2310YBU
AWR-103: Q4: 2SC1318: 512-KSC2690AYS
AWR-103: Q5: 2SB507: 863-MJE15033G
AWR-103: Q6: 2SA628A: 512-KSB1116AGBU
AWR-103: Q7: 2SA628A: 512-KSB1116AGBU
AWR-103: Q8: 2SA720: 512-KSA1220AYS
AWR-103: Q9: 2SD325: 863-MJE15032G
AWR-103: Q10: 2SC945: 512-KSD1616AGBU
AWR-103: Q11: 2SC945: 512-KSD1616AGBU
AWR-103: Q12: 2SD325: 863-MJE15032G
AWR-103: Q13: 2SC945: 512-KSD1616AGBU

Surge Current Suppressor (AWX-098)

AWX-098: C1: 10uF 63v CEA: 647-UPW1J100MDD 10uF 63v

Power Supply Assembly-B (AWR-104)

AWR-104: C9: 470uF 80v CEA: 647-UHE2A471MHD6 470uF 100v
AWR-104: C10: 470uF 80v CEA: 647-UHE2A471MHD6 470uF 100v
AWR-104: C11: 2200uF 25v CEA: 647-UPW1V222MHD6 2200uF 35v

BOM List:

647-UPW1V222MHD6 | 1
647-UHE2A471MHD6 | 2
647-UKL1H2R2KDDANA | 14
647-UKL1H010KDDANA | 4
647-UPW1V221MPD | 8
647-UKL1C101KPDANA | 8
647-UKL1H4R7KDDANA | 10
647-UPW1V101MPD | 6
647-UPW1C221MPD | 3
647-UPW1A471MPD | 6
647-UPW1H2R2MDD | 2
647-UPW1V470MED | 4
667-ECQ-V1H684JL | 2
667-ECQ-V1H224JL2 | 2
647-UKL1H100KDDANA | 6
647-UPW1V330MDD | 2
647-UHE2A221MHD | 2
647-UPW1A470MDD6 | 2
647-UPW1V100MDD | 3
647-UPW1J100MDD | 1
667-EEU-FC1H470 | 1
647-UPW1H010MDD | 1
512-KSC2310YBU | 2
512-KSC2690AYS | 2
863-MJE15032G | 3
863-MJE15033G | 1
512-KSB1116AGBU | 2
512-KSA1220AYS | 1
512-KSD1616AGBU | 4
512-KSA992FBU | 10
512-KSC1845FTA | 12
 
Last edited:
SX-1050 #1: asr-20 protect relay pcb mount 24 v 653-MY4-02-DC24 (pcb mount pins)
SX-1050 #2: asr-015 soft start relay chassis mounted 653-LY1F-DC48 (solder tabs)

652-3386H-1-501LF for VR3/VR4
652-3296P-1-202LF for VR1/VR2
 
Last edited:
Awesome!!!
Two each:
652-3296P-1-202LF 2Kohms 3296P Multi Turn : 12 3/8" Sealed parallel to pcb
652-3386H-1-501LF 500ohms 3386H Single Turn 3/8" ? 10% parallel to pcb
 
^^ Thanks

UPDATE: Parts identified and ordered. Mouser confirmed yesterday that the parts has been shipped.

Now the waiting game..
 
I've just gotten a 1050 also that needs a re-cap and I am going through the same list as you. I noticed you have not chosen to upgrade the main 22,000 uF 80v power caps and was wondering if I should do this also. The main power caps in the SX-1050 are 63.5mm diam caps, length is 120mm (2 of) and I think these are the same as those in an SX-1250 but there are 4 each.
These are some I found at Mouser and wanted to see if anyone had any opinions on any of them or other current options.

Capacitance is 22000 uF, 80v but 100v OK too.
1. United Chemi-Con 661-E36D101N223TDB7M (100 v) $24
2. Nippon Chemi-Con 100V caps E36D101LPC243UDA5M non-stocked $26
3. Nichicon 22,000 uF 80v 647-LNT1K223MSE 63.5x 100mm $46 each

Of these I like the Nichicons best as they are black but they cost a lot more.
 
I've just gotten a 1050 also that needs a re-cap and I am going through the same list as you. I noticed you have not chosen to upgrade the main 22,000 uF 80v power caps and was wondering if I should do this also. The main power caps in the SX-1050 are 63.5mm diam caps, length is 120mm (2 of) and I think these are the same as those in an SX-1250 but there are 4 each.
These are some I found at Mouser and wanted to see if anyone had any opinions on any of them or other current options.

Capacitance is 22000 uF, 80v but 100v OK too.
1. United Chemi-Con 661-E36D101N223TDB7M (100 v) $24
2. Nippon Chemi-Con 100V caps E36D101LPC243UDA5M non-stocked $26
3. Nichicon 22,000 uF 80v 647-LNT1K223MSE 63.5x 100mm $46 each

Of these I like the Nichicons best as they are black but they cost a lot more.

Thanks for your input!
 
I understand the desire to have the black caps in the PS on the 1050 but did you look at the specs? Does the Nichicon have better specs than the others or was it just a color choice?
 
That's why I'm asking here as I'm not an expert on caps. I'm hoping an expert can chime in to say which ones are suitable. From what I can see these all physically fit and meet the capacity and voltage but I'm not sure what other specs should be taken into account. But in answer to your question about color, yes- the Nichicons are black which I would prefer, all things being equal but its no biggie.
 
The reason I am not changing the filter caps on mine is because upon further inspection the caps are still in good shape. as a matter of fact, it may have been changed previously.

what were the stock caps?
 
One of the United caps is non-stock so it is out.

The ripple current on the other United is twice that of the Nichicon. Probably more than enough in either case but there is a spec difference in these. To counter that, the Nichicon is a 105°C cap vs the 85°C spec from United.
 
I've just gotten a 1050 also that needs a re-cap and I am going through the same list as you. I noticed you have not chosen to upgrade the main 22,000 uF 80v power caps and was wondering if I should do this also. The main power caps in the SX-1050 are 63.5mm diam caps, length is 120mm (2 of) and I think these are the same as those in an SX-1250 but there are 4 each.
These are some I found at Mouser and wanted to see if anyone had any opinions on any of them or other current options.

Capacitance is 22000 uF, 80v but 100v OK too.
1. United Chemi-Con 661-E36D101N223TDB7M (100 v) $24
2. Nippon Chemi-Con 100V caps E36D101LPC243UDA5M non-stocked $26
3. Nichicon 22,000 uF 80v 647-LNT1K223MSE 63.5x 100mm $46 each

Of these I like the Nichicons best as they are black but they cost a lot more.

Digikey has the Nippon caps for $26, although the site says UCC, and the Nichicon.
 
I buy from this seller. You can contact him through the messaging system and ask for a discount. Mostly Free shipping. I usually get four at a time. He will invoice through Paypal. Note: The listing is for two caps.
Ask for the black tops. The main body is blue but I like the black inserts in the top. The other option is white :)yuck:).

Direct OEM replacement in size but they are screw terminal and (10-32 machine screw size) requires a little larger opening in the ring terminals and ground buss on the set.

Adcom 22000uF 100 Volt
No affiliation.

If the caps are not leaking they are probably good. In the SX-1050 the big filter caps really don't get the workout like they would in a higher watt set in which they are also used.
Pretty blue color and bragging rights usually win out! :D

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Is there any particular reason you like the Adcoms over, say, the 3 I listed above? At $42 each, they are much more than the chemi-cons.
 
Fit and finish. Easy install.
Anyone would be hard pressed to hear any difference in sound from one over the other. I don't buy into the dynamics conversation. Not insinuating you were asking but I feel it coming on.
 
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"dynamics conversation" is way over my skill level - just now I had to google what "ripple current" was. But looking at your previous comment about these caps, I'm tending towards keeping the main caps as-is as they look fine and re-capping just the other components based on lists gleaned from yourself, echowars and mrkthefixer.
 
As long as the previous tech retrofitted the caps and the work is tidy, with no hum in the set noticed, you should be good.
 
UPDATE: Setting the DC Offset and Idle current.

I did this using the DBT. AND I am measuring at the protection board pins (using the schematic for the power amp to prot board connection). AND followed the service manual instructions.

DC offset were not adjusted as they were at 0V +/- 1mv prior.
Idle current was off. Left channel was at 2mv and right channel was at 39mv. So I adjusted both to 50mV, following the instructions on the manual.

Hooked up the speakers and I verified things are good via DBT. Then i remove the DBT and 1050 was fine. I let it run on FM for a few minutes and noticed that the power amp area is a bit warmer than prior to making adjustment.

I rechecked the idle current and it was high. made another adjustment and, whew, i think i may have dodged a bullet. Everything is a-ok for now. I'll turn it up tomorrow and see.
 
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When on the DBT and setting the amp adjustments, the DC Balance is set to zero or as close to zero as you can get. The Idle is only checked using the trimmers, making sure the outputs are responding to the trimmer movement. You have to remember that the DBT is drawing the current away from the set. After you find the outputs are responding to the trimmer movement, back off the Idle settings to almost zero and go to House power resetting the Idles to the final SM value. You had the Idles at the final setting when on the DBT. When you went to house power the Idle settings went even higher. On some sets you can't even reach the settings on the DBT, this is better because you are wondering what you did wrong but realize the set is on the DBT!

Good thing you checked the heatsinks.
 
UDPATE:

Protection board and power board B done => this recap went well.

Pwr board A => no sound. arghhh... i did not write down the voltages but I am not getting the correct voltages. as a matter of fact, i am getting 0v on pin 8 (Q8). the first relay is normal. the 2nd relay has a longer delay.

any help is appreciated. What i did with this board is changed all caps. AND only changed Q1, Q5, Q9, Q12, Q4 and Q8.
Q1 = 863-MJE15032G
Q5 = 863-MJE15033G
Q9 = 863-MJE15032G
Q12 = 863-MJE15032G
Q4 = 512-KSC2690AYS
Q8 = 512-KSA1013YBU

thanks for your help.
 
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