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Old 1st December 2007, 09:26 PM   #1
athos56 is offline athos56  United States
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Talking Trying to learn something, against my better judgment

After plowing through a few threads in an effort to educate myself, I came across this, and I need a little help. I get most of it, it sends a constant voltage to the filaments, but what does the Resistor/LED bit at the end do. I tried reading the data sheet but couldn't figure it out. Thanks
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Old 1st December 2007, 09:32 PM   #2
AKN is offline AKN  Sweden
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Hi,

"Power on" indicator.
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Old 1st December 2007, 09:33 PM   #3
athos56 is offline athos56  United States
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Hehe, really?, if that was it I'd feel kinda dumb...wouldn't be the first time
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Old 1st December 2007, 09:45 PM   #4
AKN is offline AKN  Sweden
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Well we could narrow it to a "glow on" indicator, I cannot see any other purpose. The impedance in the circuit is very low so the led current will not have any influence.
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Old 1st December 2007, 09:52 PM   #5
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Default Re: Trying to learn something, against my better judgment

Quote:
Originally posted by athos56
After plowing through a few threads in an effort to educate myself, I came across this, and I need a little help. I get most of it, it sends a constant voltage to the filaments, but what does the Resistor/LED bit at the end do. I tried reading the data sheet but couldn't figure it out. Thanks
It's a "Heaters On" panel light. It's always a good idea to include that indicator when you separate the HV and heater supplies, especially where the HV is provided by a SS power supply that otherwise doesn't indicate power up. That way, you can avoid cathode stripping by hitting cold VTs with the full HV, or "sleeping sickness" by running hot cathodes without HV.
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Old 1st December 2007, 10:02 PM   #6
athos56 is offline athos56  United States
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Default Ok!

Thanks for the responses! Next time I'll try and find a harder question to become confused about
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Old 2nd December 2007, 04:08 AM   #7
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Quote:
It's a "Heaters On" panel light. It's always a good idea to include that indicator when you separate the HV and heater supplies, especially where the HV is provided by a SS power supply that otherwise doesn't indicate power up. That way, you can avoid cathode stripping by hitting cold VTs with the full HV, or "sleeping sickness" by running hot cathodes without HV.
I suppose that with separated you mean two different trafo's? Wouldn't it be better than to connect a relay to the primary of the HV trafo, and activate this (solid state) relay from a (rectified and regulated, maybe delayed) voltage of the heaters? Surplus relays aren't that expensive.

Erik
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Old 2nd December 2007, 07:55 AM   #8
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I think he refers to a standby switch. It is a switch that cutts off the HV at the secondary side to be able to glow the tubes first before applying HV.

Somestimes the switch is bybassed by a resisitor to help the emission starting softly.

Any tube amp without slow rectifier tubes should have such a switch, either manual or automated through a relay.
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Old 2nd December 2007, 05:05 PM   #9
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Quote:
Originally posted by beamnet
I think he refers to a standby switch. It is a switch that cutts off the HV at the secondary side to be able to glow the tubes first before applying HV.

Somestimes the switch is bybassed by a resisitor to help the emission starting softly.

Any tube amp without slow rectifier tubes should have such a switch, either manual or automated through a relay.
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Old 2nd December 2007, 05:44 PM   #10
athos56 is offline athos56  United States
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I was planning on using some Ferrite beads, inrush limiters, to allow the filaments to get going first. But I have been looking at slow start switches, relays, etc. When I become confused I'll be sure to chime in
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