Anyone have a recommended capacitor list for the Technics 9070?

[Sam08861]

Just got one of these, but has the original electrolytic caps.

I have the service manual and can see which are electrolytics and of these, which are non polar.

1. What I don't know how to figure out here is if any should be low leakage/low esr caps. Any suggestions which ones or what to look for?

2. There are 2 paper electrolytics. Should I replace these too? If so, with what? PIO?

I haven't been able to locate these on the circuit board yet, but the nice thing is that the circuit board labeled on both sides with the number and polarity for the caps.

edit... found these on the schematic and is on the power switch & switched receptacle on back, not on the board. Still not sure if I should change them though and with what.

3. Some of the items are in bold on in the service manual. Any ideas what this means? Couldn't locate an explanation in the SM.

Here's a shot from above with the box shield that partially covered the 3 selector switch rods removed.



And below



Closeup showing front trace marking detail.



bottom of boards closer up



There's a lot of electrolytics, but all on two board continuous (thus flat I guess) boards accessible on both sides and labeled on both sides, should really speed things up.

Any advice or suggestions appreciated.

 

[Sam08861]

Link to service manual

https://www.hifiengine.com/manual_library/technics/su-9070.shtml

PDF page 13 has the cap list and enough details on the other boards to see the signal paths pretty easily.

Also a shot of the preamp itself so you can see the layout.

 

[Sam08861]

Just fyi for anyone searching in the future... I got answers to my questions here....

http://audiokarma.org/forums/index....use-low-leakage-caps-recapping-preamp.842030/

 

[Sam08861]

Also, in case it helps someone in the future, below is the electrolytic cap list with notations for which caps are non polar or low leakage.

c101,102 and c207, c208 were different in the unit than the parts list.

Actual unit c101/2 was 2200uf 16V while the spec called for 3300uf 6.3V (replacing with 2200uf/16V)
Actual unit c207/8 was 16V instead of 25V in the spec (replacing with 25V)

Section Locaton TYPE Value Voltage Low Leak NonPolar Old Value Old Volt
MC PRE PREAMP C101 ELECTROLYTIC 3300uf 6.3 2200uf 16V
MC PRE PREAMP C102 ELECTROLYTIC 3300uf 6.3 2200uf 16V
MC PRE PREAMP C103 ELECTROLYTIC 220uf 10
MC PRE PREAMP C104 ELECTROLYTIC 220uf 10
MC PRE PREAMP C105 ELECTROLYTIC 47uf 25
MC PRE PREAMP C106 ELECTROLYTIC 47uf 25
MC PRE PREAMP C109 ELECTROLYTIC 10uf 16 low leak
MC PRE PREAMP C110 ELECTROLYTIC 10uf 16 low leak
MC PRE PREAMP C111 ELECTROLYTIC 1uf 50
MC PRE PREAMP C112 ELECTROLYTIC 1uf 50
MC PRE PREAMP C115 ELECTROLYTIC 470uf 6.3
MC PRE PREAMP C116 ELECTROLYTIC 470uf 6.3

EQ SUBSONIC C203 ELECTROLYTIC 220uf 6.3
EQ SUBSONIC C204 ELECTROLYTIC 220uf 6.3
EQ SUBSONIC C205 ELECTROLYTIC 2200uf 6.3
EQ SUBSONIC C206 ELECTROLYTIC 2200uf 6.3
EQ AMP C207 ELECTROLYTIC 4.7uf 25 non polar 16V
EQ AMP C208 ELECTROLYTIC 4.7uf 25 non polar 16V
EQ AMP C225 ELECTROLYTIC 10uf 16
EQ AMP C226 ELECTROLYTIC 10uf 16

FLAT AMP C313 ELECTROLYTIC 10uf 16
FLAT AMP C314 ELECTROLYTIC 10uf 16

POWER SUPPLY C401 ELECTROLYTIC 3.3uf 50
POWER SUPPLY C402 ELECTROLYTIC 1000uf 63
POWER SUPPLY C403 ELECTROLYTIC 1000uf 63
POWER SUPPLY C404 ELECTROLYTIC 1uf 50
POWER SUPPLY C405 ELECTROLYTIC 1uf 50
POWER SUPPLY C406 ELECTROLYTIC 1uf 50
POWER SUPPLY C407 ELECTROLYTIC 220uf 6.3
POWER SUPPLY C408 ELECTROLYTIC 3300uf 25
POWER SUPPLY C409 ELECTROLYTIC 1uf 50 non polar
POWER SUPPLY C410 ELECTROLYTIC 1uf 50 non polar
POWER SUPPLY C411 ELECTROLYTIC 1uf 50 non polar
POWER SUPPLY C412 ELECTROLYTIC 1uf 50 non polar
POWER SUPPLY C413 ELECTROLYTIC 1uf 50
POWER SUPPLY C414 ELECTROLYTIC 1uf 50
POWER SUPPLY C415 ELECTROLYTIC 33uf 50
POWER SUPPLY C416 ELECTROLYTIC 33uf 50
POWER SUPPLY C420 ELECTROLYTIC 1uf 50
POWER SUPPLY C421 ELECTROLYTIC 1uf 50