Up for sale here is this brand new Sansui F-2436 bare circuit board.  The F-2436/F-2436-1 driver board is used in the Sansui 8080, 9090, 890, and 990, and sometimes the old boards can be damaged either from use or from repair/rebuild work.  This is a new replacement board.  It is redesigned for the 8080, 9090, 890, and 990.  It will probably work in the 881 and QRX-7001 as well, but I don't know for sure.  You can either relocate your old parts to this or you can install all new parts on this board.  This is the same dimensions as the old board, and will fit nicely in your receiver.  

This board is designed to use modern transistors and diodes, and is marked for them.  It uses a pair of 5mmx20mm fuses, either 6A 250v or 7A250v fast-blow.

The board is marked with part specs so it's easy to install new parts.  I do have a parts list to populate a board--it is at the bottom of this listing.  You will need to build this out yourself--it is obviously not complete, and I do not have complete boards available.  This is fairly advanced-level work.

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.

BOM Parts List:
DesignatorQuantityValueMouser part
C1, C222.2uF
80-R82CC4220Z370K
C11, C122470uF 80v
661-EKYB800E471ML20S
C13, C1420.047uF
R82EC2470AA60J
C15, C1620.1uF
80-R82EC3100AA70J
C17, C18, C3, C44100pF
81-RCE5C2A101J0M1H3A
C5, C6215pF
81-RCE5C2A150J0K1H3B
C7, C82100uF 25V N.P.
647-UES1E101MPM
D1, D2, D3, D4, D5a1, D5b1, D6a1, D6b181N414878-1N4148-TAP
F1, F24Fuse534-3512
H19, H20, H21, H2247173DG532-7173DG
Q1, Q2, Q3, Q44KSC1845
Q10, Q92KSC3503
Q11, Q132MJE15032
Q12, Q142MJE15033
Q5, Q62KSA1381
Q7, Q82BD-139
512-BD13910STU (*)
R1, R2, R25, R26, R5, R66120K
603-MFR50SFTE52-120k
R10, R9222K
603-MFR50SFTE52-22k
R11, R1221K
603-MFR50SFTE52-1k
R13, R14, R15, R16, R43, R44622R
603-MFR50SFTE52-22R
R17, R18, R33, R3443.3K
603-MFR50SFTE52-3.3K
R19, R2028.2K 1W
279-H4P8K2FCA
R21, R2221.8K
603-MFR50SFTE52-1.8K
R23, R242270K
603-MFR50SFTE52-270K
R27, R28233K
603-MFR50SFTE52-33K
R29, R302390R
603-MFR50SFTE52-390R
R3, R4210k
603-MFR50SFTE52-10K
R31, R32239R
603-MFR50SFTE52-39R
R35, R3621.5K
603-MFR50SFTE52-1.5K
R37, R382180R
603-MFR50SFTE52-180R
R39, R40210R
603-MFR50SFTE52-10R
R41, R42, R45, R464150R
603-MFR50SFTE52-150R
R47, R48, R49, R5044.7R
603-MFR50SFTE52-4.7R
R51, R52210R 5W
279-ROX5SSJ10R
R7, R8268K
603-MFR50SFTE52-68K
R901, R902218K
603-MFR50SFTE52-18K
RV1, RV224.7K3362W-1-502
RV3, RV421k3362W-1-102LF
ZD1, ZD229.1V ZENER78-BZX85B9V1
(*)On Semi plastic case BD-139-16 is a good option too.
(**) ECB Pinout, OnSemi or Toshiba