|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
146.18.173.104
In Reply to: RE: JAN GE 5670 black burn marks on getter flashing posted by kylealers@gmail.com on July 09, 2015 at 14:03:02
You should check the heater Voltage, and check the plate current.
Black is usually not a bad color for a getter.
Brown is bad.
White is bad.
Invisible is bad.
Chunks flaking off is bad.
Follow Ups:
The voltage's are fine but the current on the heater transformer is rated at 1.25A might that overheat them? Because the tubes are rated at a max current of 340mA sorry for the stupid questions I'm not that experienced with electronics
Not stupid at all. The rating of the transformer has noting to do with the load. Meaning that you could use a transformer rated at 1,000 amps to deliver the 0.34 amps and it would be just fine. The voltage on the tube is just following Ohms law. At 6.3 volts and 0.34 amps, the heater is really just a 18.5 ohm resistor. (V/R = A)
Thank you so much for the advice. I would've been lost without this my heater circuit is running of a old 12v power supply for a internet modem would it ba safe to earth this with all the other earth's? or should I keep the circuit isolated because I'm having a bit of earth noise . One more question when I flick my standby on or off ,it clips and spikes heavily I was told to put a series resistor behind the switch but wouldn't that lower the voltage? And if I use the resistor what size should it be? And should it be on the negative or positive side? Sorry for all the questions in one post
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: