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LED tube biasing, pros and cons
LED tube biasing, pros and cons
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Old 13th July 2018, 04:06 PM   #111
DAK808 is offline DAK808  United States
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LED tube biasing, pros and cons
Default To sum up your results?

Quote:
Originally Posted by jackinnj View Post
Some effect of the test jig? I have placed an inquiry. The baseline 50 ohm Caddock is ruler flat when using the J2130A DC Bias Injector.

Using the "Gain" method, I get consistentcy -- Z at -10dBm, 0dBm and +10dBm:
How would these results show up in the operation of the 6j5 as a driver tube for a single ended amp? Your data seems to show that at certain times the LED would go into cut off and be very non linear .
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Old 13th July 2018, 04:44 PM   #112
jackinnj is offline jackinnj  United States
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LED tube biasing, pros and cons
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Originally Posted by DAK808 View Post
How would these results show up in the operation of the 6j5 as a driver tube for a single ended amp?
Just like an 6SN7.

6J5 is half a 6SN7 with an attachment (pin1) to the can. This is cobbled together from one of SY's ideas -- use two LED's to bias the 6J5 to 8mA. The DN2540 is a $0.80 part and one is almost as good as two!

You can decide the circuitry around the 6550/807 etc/
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Old Yesterday, 05:31 PM   #113
DAK808 is offline DAK808  United States
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LED tube biasing, pros and cons
I don't understand why you would post a circuit for a 6j5 x 6550 SE amp with LED bias when your data seems to indicate a problem with cut off when implementing such a bias scheme? Did i misunderstand the gist of your graphs?
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