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Possibility of 100 Watts?
Possibility of 100 Watts?
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Old 14th October 2019, 03:28 PM   #51
rsumperl is offline rsumperl  United States
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Possibility of 100 Watts?
Good Monday everyone,
As always, thank you everyone for your inputs. Hopefully when this project is over I'll have something that is truly outstanding.
When it comes to high voltage delay, my intention is to have an Amperite Time Delay Relay control another relay. The "other" relay is a 3PDT relay. Besides delaying Plate and Screen voltage, would you delay Bias voltage?
The Amperite relay I have on hand is a 180 second unit. I'm thinking 180 seconds is more than enough time for the filaments.

Thanks as usual!
Ray
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Old 14th October 2019, 03:48 PM   #52
MelB is offline MelB  Canada
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Ya, don't delay the bias voltage. Your tubes will need that present the instant the Plate voltage appears and it typically takes a few seconds for the bias voltage to ramp up.
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Old 14th October 2019, 05:32 PM   #53
kodabmx is offline kodabmx  Canada
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Possibility of 100 Watts?
Those high value Amperite relays bounce at the sign of current draw and arc. If you mist use one, I'd use it to drive a transistor that controls an electromechanical relay.

As MelB said, connect the bias voltage on power up (switch it on with the heaters, and use a LARGE cap (220uF or higher I usually use) for it so when power is removed, the bias voltage will last longer than the B+.
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Old 14th October 2019, 06:47 PM   #54
rsumperl is offline rsumperl  United States
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Possibility of 100 Watts?
Thank you all for the hints on the Amperite. I had the Tine Delay Relay and the 3PDT relay sitting around, so I thought I would try them. I know there are solid state units out.
The Amperite is a 6 volt model as is the relay, so hopefully the Amperite doesn't take a beating. The 3PDT relay is rated for 1500 v between contacts, I have a spare just in case....
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Old 15th October 2019, 04:00 PM   #55
rsumperl is offline rsumperl  United States
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Possibility of 100 Watts?
Good Tuesday everyone,
In using a mechanical relay to control high voltage, specifically one set of contacts controlling 500 vdc and the other set 150 vdc, should I place a capacitor or R/C network across the contacts to prevent possible arcing?

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Ray
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Old 16th October 2019, 11:11 AM   #56
Mark Tillotson is offline Mark Tillotson
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That might be wise, breaking DC at significant voltage is hard, if there's enough power to sustain an arc you can start fires inside a switch. A snubber will allow the voltage across the contacts to stay low until they have separated to sufficient distance. Best is to use contacts rated for the voltage and current involved.
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Old 16th October 2019, 11:31 AM   #57
rsumperl is offline rsumperl  United States
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Possibility of 100 Watts?
Good Wednesday,
Any thoughts on component values? I’ve seen several differing values on the net.

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Old 16th October 2019, 09:15 PM   #58
kodabmx is offline kodabmx  Canada
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Possibility of 100 Watts?
Of what parts specifically?
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