[drakelist] Bad tubes in L4B

[Joe Roth]

"Joe Roth" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- I suspect I have a week pair of 3-500Z's in my L4B. Tell me if you agree.

I restored an L4B and rebuilt the power supply. PS voltages check out fine.
I drive it with a T-4XC at 90 watts. On 40m, RF output is 800w. Plate amps shows .5. Plate voltage is at 2000 on TX (2500 at rest).

The grid bothers me as the meter pins past full scale. If I drop the RF drive to around 45-50 watts, the grid current drops to 300ma.
The amp is running on 120 VAC for now.

Thanks for your tips!
73
Joe, WC4R



www.wc4r.com
www.rothweb.net
http://members.cox.net/kg4kaw

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