cary SLA 70

manner · 7th October 2010, 03:22 AM

Hi,
I have acary SAl 70 amp. the 5AR$ arcs a lot.
I was told that the problems was due to the large fliter cap(1100uf).
Some siad that this can be solved with a CL90 thermistor?
Where should I put it?
Thanks.
Manner

costis_n · 7th October 2010, 06:14 AM

You should place it between the 5AR4 and the 1100μ capacitor (+) terminal. Valve rectifiers cannot handle the high ripple current of such a large capacitor. Was this capacitor there originally, or is it a later modification by a "guru"? I cannot believe that Cary made such a bad design!

manner · 7th October 2010, 06:33 AM

it is original.
Thanks.

manner · 7th October 2010, 08:57 AM

Hi Costi-n,
Do you mean here?
Thanks
manner

manner · 8th October 2010, 02:35 PM

Still have problem after putting in the CL90.
The 5AR4 arcs and the fuse of my step blew when I switch on the amp.
Any moore suggestions?
Thanks

Captn Dave · 8th October 2010, 03:06 PM

Deja Vu. Is this same problem not an active thread elsewhere?

Try placing a 100R power resistor and a 22uf cap in a pi filter configuration between the rectifier and that big cap. That should do it. An inductor would even be better. Either should do the trick.

costis_n · 16th October 2010, 08:01 PM

Quote:

Originally Posted by manner

Hi Costi-n,
Do you mean here?
Thanks
manner

Where is "here"? I can't tell, really

directdriver · 17th December 2010, 12:50 AM

Quote:

manner: Do you mean here?

Yes, place the thermistor between the tube pin#8 and red wire that routes back to the cap. You can use pin#7 to hold the thermistor as a solder point.

Good luck.

directdriver · 17th December 2010, 12:52 AM

Quote:

costis_n: I cannot believe that Cary made such a bad design!

Yes, they can.

Evenharmonics · 17th December 2010, 03:13 PM

Quote:

Originally Posted by manner

The 5AR4 arcs

You will need a new 5AR4 too. Once it arcs, it's pretty much gone.

7th October 2010, 03:22 AM	#1
manner diyAudio Member Join Date: Oct 2010	cary SLA 70 Hi, I have acary SAl 70 amp. the 5AR$ arcs a lot. I was told that the problems was due to the large fliter cap(1100uf). Some siad that this can be solved with a CL90 thermistor? Where should I put it? Thanks. Manner

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7th October 2010, 06:14 AM	#2
costis_n Tinkerer diyAudio Member Join Date: Aug 2008	You should place it between the 5AR4 and the 1100μ capacitor (+) terminal. Valve rectifiers cannot handle the high ripple current of such a large capacitor. Was this capacitor there originally, or is it a later modification by a "guru"? I cannot believe that Cary made such a bad design!

7th October 2010, 06:33 AM	#3
manner diyAudio Member Join Date: Oct 2010	it is original. Thanks.

8th October 2010, 02:35 PM	#5
manner diyAudio Member Join Date: Oct 2010	Still have problem after putting in the CL90. The 5AR4 arcs and the fuse of my step blew when I switch on the amp. Any moore suggestions? Thanks

8th October 2010, 03:06 PM	#6
Captn Dave diyAudio Member Join Date: Jun 2008	Deja Vu. Is this same problem not an active thread elsewhere? Try placing a 100R power resistor and a 22uf cap in a pi filter configuration between the rectifier and that big cap. That should do it. An inductor would even be better. Either should do the trick.

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