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Technics SP 15 capacitors - manual discrepancy

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Posted on January 18, 2017 at 05:38:50
GregK
Audiophile

Posts: 465
Location: NE Ohio
Joined: September 30, 1999
 Greetings all!

I posted this question on the Vinyl Engine site but thought I'd also ask here since this is where I frequent and have gotten the most info..

I'm getting back into looking at replacing the electrolytic capacitors in my SP15. Looking at the Technics SP15 manual, several of the electrolytic capacitors have different spec values between the replacement parts list table and the board circuit diagrams. Specifically:

C10 - table says 16V100uF and diagram says 50V100uF
C21 - table says 35V33uF and diagram says 25V33uF
C108-110 - table says 35V33uF and diagram says 25V33uF
C119 - table says 50V10uF and diagram says 16V10uF
C213 - table says 25V47uF and diagram says 16V47uF
C214 - table says 50V10uF and diagram says 16V10uF
C217 and 218 - table says 25V47uF and diagram says 16V47uF
C303 and 304 - table says 50V100uF and diagram says 16V10uF
C312 - table says 50V10uF and diagram says 16V10uF
C318-320 - table says 10V220uF and diagram says 6V220uF

The schematic has the same values as the board circuit diagrams.

Does anyone know for sure if the diagram/schematic values or the parts list values are correct? One of the V.E. responses I received stated that the voltage isn't the operating voltage, just the max voltage they can handle. IF this is the case, do I go with the higher voltage option for each (if available)? Also, if it is the case, I guess I'm most worried about C303/304 since they have differing capacitance values...

Thanks, Greg

 

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RE: Technics SP 15 capacitors - manual discrepancy, posted on January 18, 2017 at 05:42:34
EdAInWestOC
Audiophile

Posts: 6828
Location: Glen Burnie, MD USA
Joined: December 18, 2003
 Greg,
The rule of thumb is this...documentation can be wrong or subject to update. Always pay attention to what is installed on your circuit board. The documentation is good guidance but look on your circuit board for the parts you need to order.

Ed
Life is analog...digital is just samples thereof

 

RE: Technics SP 15 capacitors - manual discrepancy, posted on January 18, 2017 at 07:00:56
Uncle Mike
 Ed
I will add to what you have to say. Often during manufacturing parts are bought in bulk so what is on the floor at the time gets installed.
Greg
On the voltage ratings err to the higher rating, it's a safety factor. C303 &304 I would be willing to bet are power supply caps so I would leave them the same valve as installed.

 

RE: Technics SP 15 capacitors - manual discrepancy, posted on January 18, 2017 at 07:06:29
Dave Garretson
Audiophile

Posts: 2448
Joined: June 14, 2005
 When recapping my SP-10 and L07D I usually went up in voltage, on the theory that a higher-voltage rated cap should last longer.

Electrolytics have improved in quality and gotten physically smaller over the years. The higher voltage ones will fit in places where they could not during the vintage years of DD turntables.

 

RE: Technics SP 15 capacitors - manual discrepancy, posted on January 18, 2017 at 07:23:10
Lew
Audiophile

Posts: 10911
Location: Bethesda, Maryland
Joined: December 11, 2000
 Following behind what Dave G wrote: When in doubt, I would choose the higher of the two values for voltage. It can't hurt. I also see that there is one instance (C303, 304) where there is a discrepancy wrt capacitance. In that case, I would go with what you see as OEM installed in the PCB. Replace like with like. Or figure out what the capacitor is actually doing in the circuit and decide whether 100uF does it better than 10uF.

 

2nd! (nt), posted on January 18, 2017 at 10:40:32
Crazy Dave
Audiophile

Posts: 14371
Location: East Coast
Joined: October 4, 2001

 

RE: Technics SP 15 capacitors - manual discrepancy, posted on January 19, 2017 at 02:18:52
flood2
Audiophile

Posts: 2558
Joined: January 11, 2011
 The higher voltage rated caps will have a lower loss tangent (lower ESR). Normally a designer will choose a margin of at least 2x the actual voltage across the cap. So if the max voltage is say 15V, the designer would normally choose 35V.
For a given cap "model" if a designer has opted for the 50V version even the diagram shows 16V, he may be doing it because that particular brand requires him to use the 50V version to meet the ESR requirements.
The value for C303 and C304 will depend on what the purpose is. If they are smoothing caps at the output of a regulator, then they are for stability and the minimum value would be 10uF. The 100uF will give a slightly improved stability and reduced output ripple if the transient current draw rate is higher than the regulator can sustain without a larger reservoir but you may get more noise passing through - the lower values are better. What are they used for? Power supply decoupling?

General rule of thumb (which everyone else has already mentioned) just do a like for like replacement on what you see unless you understand the circuit enough to modify it. Even then, throwing in exotic low ESR caps can actually make things worse if the designer has fine tuned the design with a particular cap property in mind - case in point Oscon caps require a series resistor to limit the current as the peak current can exceed diode ratings if you are replacing a "normal" electrolytic with an Oscon!
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

 

Thanks all for your valuable insight!, posted on January 19, 2017 at 10:52:58
GregK
Audiophile

Posts: 465
Location: NE Ohio
Joined: September 30, 1999
 As an engineer, I was trying to be efficient and have all that I need on hand, but I'm not in any hurry so I'll take a look/see at what's on each of the boards and plan my shopping accordingly.

Happy listening!

Greg

 

Digikey and Mouser, posted on January 19, 2017 at 11:33:54
Lew
Audiophile

Posts: 10911
Location: Bethesda, Maryland
Joined: December 11, 2000
 From someone who re-capped two SP10 Mk2s and one SP10 Mk3, you can get any and all electrolytics cheaply and quickly from Digikey or Mouser, in case you didn't already know.

 

Thanks, Lew! I knew about Digikey..., posted on January 19, 2017 at 12:22:13
GregK
Audiophile

Posts: 465
Location: NE Ohio
Joined: September 30, 1999
 ...but Mouser is new to me. There's also Parts Express but my quick check showed they didn't have a 250V 100uF electrolytic, only a 350V. I'll check out Mouser as well...

 

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