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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: Disconnecting Relay sound like over-kill posted by Tom Bavis on May 3, 2017 at 07:35:06:
"...the timing cycle will occur on a brief power interruption as well as cold turn-on."
Exactly right. The main relay will drop out instantly in the event of a power failure, then the delay relay cycles again. This is necessary in order to be sure the DHT filaments are always at full temperature when HV is applied.
About Johno's comments, none of the glass delay relays in my stash have contacts rated anywhere near 30A. Most are probably 3A, and that's probably a non-inductive rating, perhaps DC. I've also noticed costs rising for these parts, and I wonder if replacements will be easy to find in 10 or 20 years. Call it overkill if you want, but all things considered, I don't regret taking the necessary steps to see that these last as long as possible.
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- Re: Disconnecting Relay sound like over-kill - Triode_Kingdom 08:32:06 05/03/17 (0)
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