开云体育

Bob, I refuse to change the band switch.? It will just happen again at some point with a new switch.? I see this problem all the time in fact just last week. The problem is too widespread to be coincidence. Heavy rtty on 160 seems? to be a common denominator.? It might even be 160 with poor antenna characteristics.? If you look back as far as the AL80A you’ll see the same problem however the “ corona washer” seemed to be a fix on that?amp.? I’m thinking that washer acted as a heat sink but JI mentioned corona voltages. ? Take your pick.

On Tuesday, May 9, 2023, 7:55 AM, Bob <W4JFABob@...> wrote:

I have two questions about this.

Lou, Do you just replace the band switch? If so, with what?

Adrian, What is "copper RL"?

Bob? W4JFA

On Tue, May 9, 2023 at 6:39?AM Louis Parascondola via <Gudguyham=[email protected]> wrote:

That wire goes up to the two 170 pf doorknobs in parallel for padding the tune cap on 160.? That wire runs down to the bandswitch ?and is grounded through the switch completing the padding of the tune cap.? It’s a point of high RF circulating currents .? This same issue was prevalent in the AL80A. SB1000 and LK500 amps with the small switch. ?

On Monday, May 8, 2023, 10:40 PM, Bob <W4JFABob@...> wrote:

Not sure if it'll fit but a solid spark plug wire may be a choice. They're designed not to arc and are running very high voltages. Just a possible option.

Bob? W4JFA

On Mon, May 8, 2023 at 10:00?PM Jim VE7RF <jim.thom@...> wrote:

Lou, what's this... 'mystery insulated wire'? ?that runs down the inside of the bandswitch used for ??? ?It could always be replace, and some extra teflon tubing slid over it.?