Dual-C Filter Capacitor G-7000

[r_s_guy]

What should the capacitance reading on this Dual-C Filter Capacitor from the G-7000 unit be? Is this a bad capacitor?
Middle + Red = 8.79mF
Middle + Black = 7.84mF
Red + Black = 4.14mF

Marking on the cap says:
12000 uF + 12000uF

 

[DougBrewster]

Both caps are about 30% low so the red/black reading is also going to be low; capacitors in series are like resistors in parallel.

 

[r_s_guy]

Readings on the other filter capacitor is worse then.
Middle + Red = 7.8mF
Middle + Black = 1.21uF!!
Red + Black = 1.19uF!!

How does one replace this Dual-C capacitor? These are no longer available anywhere.

 

[ivandezande]

Readings on the other filter capacitor is worse then.
Middle + Red = 7.8mF
Middle + Black = 1.21uF!!
Red + Black = 1.19uF!!

How does one replace this Dual-C capacitor? These are no longer available anywhere.

Get creative. You can mount a PCB where the old caps were to hold new ones, you can gut the cans and try to fit two inside, or you could potentially fit two caps in each clamp with a spacer.

 

[Sloper1940]

Yes l stuffed the old caps on my AU70.

regards Bruce

 

[r_s_guy]

Yes l stuffed the old caps on my AU70.

regards Bruce

I would like to try the restuff method. Can you list out what capacitor (brand, series, size) you used that would fit in the old cans? Mouser/DigiKey Part numbers if possible? Pictures?

 

[Hyperion]

I would like to try the restuff method. Can you list out what capacitor (brand, series, size) you used that would fit in the old cans? Mouser/DigiKey Part numbers if possible? Pictures?

I don't think the AU-70 uses the same capacitors as the G-7000.

Take a look here Post #32-36 for Dual Cap restuff...

https://audiokarma.org/forums/index.php?threads/g-7000-for-reconditioning.838710/

I don't have part numbers but I have said what types & sizes of capacitors I used.

 

[r_s_guy]

Get creative. You can mount a PCB where the old caps were to hold new ones, you can gut the cans and try to fit two inside, or you could potentially fit two caps in each clamp with a spacer.

Are there any old threads with instructions, pictures or parts list? I get the concept, but i need help with the specifics.

 

[Hyperion]

Are there any old threads with instructions, pictures or parts list? I get the concept, but i need help with the specifics.

See my post above.

 

[r_s_guy]

Thank you, I will explore the restuff method through the old threads.

If building a PCB to hold the caps, how would one go about that? Or are there pre-made PCBs you can purchase for the purpose?

 

[Hyperion]

Thank you, I will explore the restuff method through the old threads.

Double click on the link I posted in my post #7 and go to post #32-36 in the linked thread - not quite step-by-step instructions but better than nothing.

Here is the link again
https://audiokarma.org/forums/index.php?threads/g-7000-for-reconditioning.838710/

From Post #32

 

[punchback]

I used this method detailed in the thread below. It's really more for the type of multi-section cap you'd find in tube gear. It worked really well. I heated the exterior of the cap to help the guts slide out more easily. I always like to maintain the look of the old cap but that shrink wrap exterior would be hard to maintain.

https://audiokarma.org/forums/index.php?threads/clean-can-capacitor-rebuild-scott-owners.750137/

 

[punchback]

If maintaining the old appearance isn't a priority look at adapt-a-cap for a pcb board that allows up to 4 new caps to be mounted together.

 

[r_s_guy]

Double click on the link I posted in my post #7 and go to post #32 in the linked thread - not quite step-by-step instructions but better than nothing.

Here is the link again
https://audiokarma.org/forums/index.php?threads/g-7000-for-reconditioning.838710/

From Post #32

Thank you. Great post and solution. Did you actually fit in 4 caps in the old can?

What brand/series did you use, or how did you figure out the correct size?

I don't think any of the Nichicon LKG big can caps normally used for filter, would fit.

 

[Hyperion]

Thank you. Great post and solution. Did you actually fit in 4 caps in the old can?

What brand/series did you use, or how did you figure out the correct size?

It's all there Post #32-36

I don't think any of the Nichicon LKG big can caps normally used for filter, would fit.

No not likely - they are usually bigger than other capacitors of the same value.

 

[ivandezande]

Thank you, I will explore the restuff method through the old threads.

If building a PCB to hold the caps, how would one go about that? Or are there pre-made PCBs you can purchase for the purpose?

eBay normally has some options.