If a pentode (such as EL34) has shorted, can you tell this by measuring it cold with an ammeter ?
D DonDiego Member Joined 2010 2010-10-21 1:59 am #1 2010-10-21 1:59 am #1 If a pentode (such as EL34) has shorted, can you tell this by measuring it cold with an ammeter ? ••• More options Share jerluwoo Member Joined 2006 2010-10-21 3:03 am #2 2010-10-21 3:03 am #2 if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short. ••• More options Share D DF96 R.I.P. Joined 2007 myweb.tiscali.co.uk/g8hqp/ 2010-10-21 2:00 pm #3 2010-10-21 2:00 pm #3 A resistance meter or continuity tester might be better than an ammeter. Some shorts might only develop when the valve is hot and the metal expands. ••• More options Share D DonDiego Member Joined 2010 2010-10-21 11:25 pm #4 2010-10-21 11:25 pm #4 Best to do it with a tube (valve) tester then ? ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
jerluwoo Member Joined 2006 2010-10-21 3:03 am #2 2010-10-21 3:03 am #2 if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short. ••• More options Share D DF96 R.I.P. Joined 2007 myweb.tiscali.co.uk/g8hqp/ 2010-10-21 2:00 pm #3 2010-10-21 2:00 pm #3 A resistance meter or continuity tester might be better than an ammeter. Some shorts might only develop when the valve is hot and the metal expands. ••• More options Share D DonDiego Member Joined 2010 2010-10-21 11:25 pm #4 2010-10-21 11:25 pm #4 Best to do it with a tube (valve) tester then ? ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link
if any elements of the tube other than the heater have a low dc resistance between them, that would indicate a short.
D DF96 R.I.P. Joined 2007 myweb.tiscali.co.uk/g8hqp/ 2010-10-21 2:00 pm #3 2010-10-21 2:00 pm #3 A resistance meter or continuity tester might be better than an ammeter. Some shorts might only develop when the valve is hot and the metal expands. ••• More options Share D DonDiego Member Joined 2010 2010-10-21 11:25 pm #4 2010-10-21 11:25 pm #4 Best to do it with a tube (valve) tester then ? ••• More options Share Show hidden low quality content Status This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
A resistance meter or continuity tester might be better than an ammeter. Some shorts might only develop when the valve is hot and the metal expands.
D DonDiego Member Joined 2010 2010-10-21 11:25 pm #4 2010-10-21 11:25 pm #4 Best to do it with a tube (valve) tester then ? ••• More options Share