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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Dynaco Question and 5U4 posted by Steve O on December 9, 2006 at 19:47:29:
Yes, a thermistor is helpful.IMO, the thermistor belongs on the primary of the PT where it not only delays HV a little, it also greatly reduces primary current inrush due to cold filaments. I like the CL-90 for amps of this power class. This is 120 ohms cold, ~2-4 ohms hot and is good for 2A. They're now branded GE but used to be Keystone proucts.
In some apps I've worked up a simple delay circuit that shorts the thermistor after about 30 sec so it can cool off and be ready to protect if a momentary power loss occurs. It's based on the venerable 555 timer and drives a cheap 10A relay directly.
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Follow Ups
- Re: Dynaco Question and 5U4 - Steve O 09:40:22 12/10/06 (2)
- Re: Dynaco Question and 5U4 - nicolas 01:34:56 12/12/06 (1)
- Re: Dynaco Question and 5U4 - Steve O 20:24:31 12/12/06 (0)
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