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Tube amp high-voltage delay
Tube amp high-voltage delay
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Old 27th September 2021, 07:29 AM   #81
jean-paul is offline jean-paul  Netherlands
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Overengineering 101. The NTC does a good job in all circumstances. Probably too simple and too effective
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Old 27th September 2021, 08:03 AM   #82
jan.didden is offline jan.didden  Europe
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NTCs are boring for an audio diy-er JP!

Jan
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Old 27th September 2021, 08:03 AM   #83
jean-paul is offline jean-paul  Netherlands
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Look at tubes
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Old 27th September 2021, 08:07 AM   #84
TonyTecson is offline TonyTecson  Philippines
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NTC's are about as simple as it gets...aside from NTC's i also stick in an MOV across the power traffo primary...
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Old 27th September 2021, 11:56 AM   #85
JoeAlders is offline JoeAlders  Netherlands
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MOV ?? What is it?
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Old 27th September 2021, 12:01 PM   #86
TonyTecson is offline TonyTecson  Philippines
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Quote:
Originally Posted by JoeAlders View Post
MOV ?? What is it?
mov electronics - Google Search

Quote:
MOV electronics
A varistor is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode. ... This type is commonly known as the metal-oxide varistor (MOV).
Varistor - Wikipedia).
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Old 27th September 2021, 12:24 PM   #87
NickKUK is offline NickKUK  United Kingdom
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Originally Posted by Mark Johnson View Post
Then it might be a nice idea to have the sequencer switch the mains at a voltage peak, both switch-on and switch-off.
You’ll probably want to cover brownout and mains cable disconnect/reconnect like an intermittent mains outage.
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Old 28th September 2021, 02:02 AM   #88
TonyTecson is offline TonyTecson  Philippines
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^with arduino, imo that is possible with the right sensors...
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Old 30th September 2021, 10:05 AM   #89
jan.didden is offline jan.didden  Europe
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Some info on how to select NTCs for transformer inrush protection.

Read especially the 1st para, saying that you should not switch on at zero crossing! I have been preaching that for years, only to be cut down for it ...

Jan
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File Type: pdf xformer inrush protection calc.pdf (803.8 KB, 21 views)
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Old 30th September 2021, 10:14 AM   #90
jean-paul is offline jean-paul  Netherlands
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Common knowledge on dutch technical schools decades ago. Anyone reading Elektuur/Elektor knew this too.

It seems today some people search for complicated ways to solve non-issues already solved a long time ago. Or, worse, to find a new way of doing things that is way worse than the old method. On this forum one can detect some design errors in designs that are accepted and defended.

Nah, quality and efficiency are boring
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Last edited by jean-paul; 30th September 2021 at 10:20 AM.
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