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Ken; In position 2, the output side of the reactive components of the tuner remain connected between the RF output and ground. Depending on the design of the tuner, the settings of the tuner, and the

I would imagine you could Run RF out from TX to switch (common) Connect a jumper from Position 1 to Tuner input Connect a jumper from Posiition 2 a jumper on Tuner output where there is a T connector

Lyndon; It wasn't clear whether you wanted a solution you could implement inside the tuner, or with external components, and the dummy load connection is a new wrinkle I was thinking you would want

Hi Lyndon >>> I believe what you need is one of these integrated Dow-Key coax switching bypass relays. There are several of these in stock at the Restoration Center in Pahrump, Nevada, where I do

Plate current is a fixed meter shunt. What is adjustable is the grid current metering. And the high voltage meter, but you don't want to mess with that unless you have a real HV probe. It's not

Lyndon; I should have paid more attention to your original post. To be able to switch your tuner in and out with a single switching control (manual or relay), you need a DPDT coax switch... AKA a

I've gotta say, some of the over-engineering here is pretty spectacular :-) I'm going to go with a 3-position ceramic wafer (dummy load, direct, tuned). --lyndon

It appears that now, my older Eimac 3-500Z tubes are the cause of the parasitic oscillations. I replaced the tubes with a newer set of 3-500ZG's and it seems to be working much better.? It seems the

If you're looking for a quality mechanical coaxial switch, with high-power capacity, low loss through UHF frequencies and very well-controlled (50 Ohm) impedance, the Bird CoaXwitch products are an

Reducing the HV can be done with a variac, lightbulb, heater elements, ?etc. but the filament primary needs to be isolated from the HV transformer primary.

Dow-Key transfer relay that can be placed anywhere and controlled from the operating position.

You want what's known as a transfer switch.? B&W made them and I see them for sale on eBay from time to time.? Here's the only one I found on a search just now, but it will do exactly what you need

Bob, Just so I understand fully, When you "key" the amp (no driving power) the plate current "goes to max"? On my L-4B the plate current max is? 1A !? If it is indeed MAX (1A) the power supply

Update: The TR7 includes a 500Hz. filter, a 1.8kHz. filter and a 6kHz. filter. Thanks, Robin Midgett K4IDC [email protected]> wrote:

Just throwing spaghetti against the wall here... Maybe your 7610 does not like the input circuit of the amp and is breaking into oscillation? Maybe you still have a relay issue. Hot switching can

Those units have F connectors...typically used in 75 ohm CATV circuits. Probably not suitable for 50 ohm radio circuits. Thanks, Robin Midgett K4IDC [email protected]> wrote:

Well, Alpha must have put that extra choke in there for a reason. :) This amp was built in 1977 and was still working. It was idle for many years before it saw light duty in the W0BJQ club shack until

Bob, I know you probably don't want to hear this, but have you considered 'exorcism'? Keep plugging away at it and I'm sure you'll figure it out. 73 de Steve, NR4M

Just got it back together after a full inspection.? Burnished the TR relay contacts, dirty but not arced. Now notice on low power CW mode, the Plate Current goes to max when I keyup and then takes

Down the page the specs say? +20 dbm.? Isn't that 100 milliwatts ?? Very low power . Ralph ku4pt