STRANGE CAPACITOR

sakis · 23rd May 2012, 06:43 PM

on the picture you may see a filter capacitor that is located in the main power supply of a technics SE-900 SM2

The capacitor under question has a spring coil of wire 1.5mm thick of a few turns connected to nowhere

Any body might have an idea wtf is this ?

Nico Ras · 23rd May 2012, 07:04 PM

Hi Sakis,

It was made intentionally so it must have some purpose. The Japanese never did something for no reason, they must have research and found some anti-resonating properties or something. Maybe the owners manual or marketing brochure will have reference to some unique feature of the amp.

sakis · 07:29 PM

hello Nico ...always nice to hear from a friend ....
beyond capacitors best regards for you and family and i wish things a re better in SA than is for us in Europe

( still though we actually do fine )

as about the manual or a service manual i can only locate the SE 900 which is different from the SE 900 SM 2 and doesn't have this feature or any reference on the specific cap.

somewhere far away in the past i recall that i have seen the zobel coil ( inductor) rounded on the capacitor but this one is no part of the circuit

kind regards
sakis

AKN · 23rd May 2012, 07:32 PM

Hi Sakis,

Technics TA-KE II caps. Babboo fiber in separator and that spring should probably give both stiffness and damping to the cap body due to dissimilar metals. Not to mention a fancy spiral look through the heat shrink wrap.

I think this is mostly snake oil but at least it does make the amp itself worse.

I have myself recently restored a SE-A900 SM2 and IMO it sounds very good.

One thing to watch out for if replacing these caps on this is the cap support pins. On the PCB one support solder pad is not insulated. Usually cap mfg specifies that support pins should be isolated (NC). Easy fix to isolate pin/pad on the PCB.

sakis · 23rd May 2012, 07:40 PM

thanks ....

marvelous .... snake oil !!! does it also come in flavors ??? strawberry could be nice !!!

Ian Finch · 24th May 2012, 05:01 AM

This reminds me of the fashion, some years back, for removing PVC sleeving from electrolytics to avoid
resonance - or was that about electrostatic charge on the PVC?

Hmmm,.. resonant electrolytics, eh?
Yep....snake oil!.. (make mine chocolate malted!)

sofaspud · 24th May 2012, 05:16 AM

I can imagine the spiral wire absorbing some heat, and causing the capacitor, should it do so, to blow upwards rather than outwards. Otherwise... nada.

jitter · 24th May 2012, 05:17 AM

Quote:

Originally Posted by sakis

as about the manual or a service manual i can only locate the SE 900 which is different from the SE 900 SM 2 and doesn't have this feature or any reference on the specific cap.

Did you mean SE-A900SM2? If so, what about this service manual?

AKN · 24th May 2012, 06:01 AM

Quote:

Originally Posted by AKN

I think this is mostly snake oil but at least it does make the amp itself worse.

Correction: ....but at least it does NOT make the amp itself worse.

Sorry

sakis · 24th May 2012, 07:45 AM

thanks Jitter for the schematic with the first look there is no other difference from the one i have than a switch in the rear to control the VU meter lights and the snake oil capacitors ...

Kind regards
sakis

23rd May 2012, 06:43 PM	#1
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	STRANGE CAPACITOR on the picture you may see a filter capacitor that is located in the main power supply of a technics SE-900 SM2 The capacitor under question has a spring coil of wire 1.5mm thick of a few turns connected to nowhere Any body might have an idea wtf is this ? __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

23rd May 2012, 07:04 PM	#2
Nico Ras diyAudio Member Join Date: Nov 2005 Location: Amanzimtoti - East Coast of South Africa	Hi Sakis, It was made intentionally so it must have some purpose. The Japanese never did something for no reason, they must have research and found some anti-resonating properties or something. Maybe the owners manual or marketing brochure will have reference to some unique feature of the amp. __________________ Kindest regards Nico

23rd May 2012, 07:26 PM	#3
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	hello Nico ...always nice to hear from a friend .... beyond capacitors best regards for you and family and i wish things a re better in SA than is for us in Europe ( still though we actually do fine ) as about the manual or a service manual i can only locate the SE 900 which is different from the SE 900 SM 2 and doesn't have this feature or any reference on the specific cap. somewhere far away in the past i recall that i have seen the zobel coil ( inductor) rounded on the capacitor but this one is no part of the circuit kind regards sakis __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr Last edited by sakis; 23rd May 2012 at 07:29 PM.

23rd May 2012, 07:32 PM	#4
AKN No snake oil diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Hi Sakis, Technics TA-KE II caps. Babboo fiber in separator and that spring should probably give both stiffness and damping to the cap body due to dissimilar metals. Not to mention a fancy spiral look through the heat shrink wrap. I think this is mostly snake oil but at least it does make the amp itself worse. I have myself recently restored a SE-A900 SM2 and IMO it sounds very good. One thing to watch out for if replacing these caps on this is the cap support pins. On the PCB one support solder pad is not insulated. Usually cap mfg specifies that support pins should be isolated (NC). Easy fix to isolate pin/pad on the PCB. __________________ / Anders

23rd May 2012, 07:40 PM	#5
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	thanks .... marvelous .... snake oil !!! does it also come in flavors ??? strawberry could be nice !!! __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr


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24th May 2012, 05:01 AM	#6
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Bamboo cap. sleeving This reminds me of the fashion, some years back, for removing PVC sleeving from electrolytics to avoid resonance - or was that about electrostatic charge on the PVC? Hmmm,.. resonant electrolytics, eh? Yep....snake oil!.. (make mine chocolate malted!) __________________ regards

24th May 2012, 05:16 AM	#7
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	I can imagine the spiral wire absorbing some heat, and causing the capacitor, should it do so, to blow upwards rather than outwards. Otherwise... nada. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

24th May 2012, 07:45 AM	#10
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	thanks Jitter for the schematic with the first look there is no other difference from the one i have than a switch in the rear to control the VU meter lights and the snake oil capacitors ... Kind regards sakis __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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