[AMPS] L4B parasitic reistors
Tue, 18 Apr 2000 08:58:34 -0700
>I picked up a very nice L4B the other day that works FB (only used it on
>40/80m though). When I took it apart to clean the tubes and dust off the
>chassis I noticed that two of the three 15ohm 2watt resistors on the each
>suppressor was completely burned through in half. Interstingly, one
>resistor out of the three on each one looks like it never got hot at all.
>I am going to replace all the resisters but I was wondering why two out of
>the three resistors are almost vaporized while one is intact. I dont see
>any sighs of arcing or overheating anywhere else in the amp - it looks
>like brand new otherwise.
The only possible way to toast suppressor resistors on 40m/80m is to have
an intermittent VHF oscillation.
When R-supp burns out, it is not because the resistors were defective.
- Rich..., 805.386.3734, www.vcnet.com/measures.
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Administrative requests: amps-REQUEST@contesting.com