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Old 7th October 2010, 03:22 AM   #1
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Default 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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Old 7th October 2010, 06:14 AM   #2
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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!
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Old 7th October 2010, 06:33 AM   #3
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it is original.
Thanks.
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Old 7th October 2010, 08:57 AM   #4
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Hi Costi-n,
Do you mean here?
Thanks
manner
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Old 8th October 2010, 02:35 PM   #5
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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
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Old 8th October 2010, 03:06 PM   #6
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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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Old 16th October 2010, 08:01 PM   #7
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Quote:
Originally Posted by manner View Post
Hi Costi-n,
Do you mean here?
Thanks
manner
Where is "here"? I can't tell, really
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Old 17th December 2010, 12:50 AM   #8
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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.
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Old 17th December 2010, 12:52 AM   #9
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Quote:
costis_n: I cannot believe that Cary made such a bad design!
Yes, they can.
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Old 17th December 2010, 03:13 PM   #10
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Quote:
Originally Posted by manner View Post
The 5AR4 arcs
You will need a new 5AR4 too. Once it arcs, it's pretty much gone.
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