johnheath Well-known member Joined Jul 31, 2014 Messages 890 Location Sweden Nov 27, 2019 #1 Hi all... I have a question regarding what happens if the maximum voltage between heater and cathode is exceeded? I just want to get my head around this even if it is a noobie question Best regards // John
Hi all... I have a question regarding what happens if the maximum voltage between heater and cathode is exceeded? I just want to get my head around this even if it is a noobie question Best regards // John
ruffrecords Well-known member Joined Nov 10, 2006 Messages 16,308 Location Norfolk - UK Nov 27, 2019 #2 The insulation between the two may break down. This will increase leakage between heaters and cathode. At a minimum it will induce hum into the cathode, at worst it could lead to a heater cathode short. Cheers Ian
The insulation between the two may break down. This will increase leakage between heaters and cathode. At a minimum it will induce hum into the cathode, at worst it could lead to a heater cathode short. Cheers Ian
johnheath Well-known member Joined Jul 31, 2014 Messages 890 Location Sweden Nov 27, 2019 #3 Thank you Ian A short and solid answer as usual. Best regards // John
gyraf Well-known member Staff member GDIY Supporter Moderator Joined Jun 4, 2004 Messages 11,897 Location Aarhus, Denmark Nov 27, 2019 #4 ..plus (in my experience) you tend to get tubes dying too early of microphonics if you run them too hard in this regard..
..plus (in my experience) you tend to get tubes dying too early of microphonics if you run them too hard in this regard..
johnheath Well-known member Joined Jul 31, 2014 Messages 890 Location Sweden Nov 27, 2019 #5 Thank you Gyraf I have heard about this before but no one has been able to confirm it. I guess that avoiding a voltage too close to the limit is highly recommended best regards // John
Thank you Gyraf I have heard about this before but no one has been able to confirm it. I guess that avoiding a voltage too close to the limit is highly recommended best regards // John