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Lou, Mike and all, I turned it on and watched it with no drive.? At around 5 minutes the plates began turning red. See hopefully attached pictures.? I got no reading (0) on the plate and grid

Turn amp on and observe two things, as soon as?you turn it on look for your grid meter going negative and or the plate meter reading positive. ?Look for you tubes starting to gest up in a minute or

Sounds like one of the 3-500s has a grid to cathode short. Remove them one at a time to find the bad one be VERY CAREFUL the plate meter is at zero before you touch anything. HV KILLS!

Hi Everone, I've owned this amp about 5 years but used very little. The amp was refurbished (new tubes, and relays) by a guy in north Idaho about 2017, just before I bought it. I have tried to contact

I have a 4cx1500B with 350 screen, 3500 volts plate. It does 3kw peak on SSB. Its been run at 1500 with 2500 volts on plate for 4 years now. Very important to have a negative and positive going

Hi guys. I found this on another site - interesting ! Regards, John VK6JX Sent: Tuesday, November 28, 2023 1:24 AM To: [email protected] Subject: Re: [ham-amplifiers]

OK. That's very encouraging. You could be right, as we had no other 1500B tubes to compare it with. Thanks, Alek.

If you run a drill bit into the base of a 4x1k or 4x1.5k to enlarge the hole slightly, you'll also wind up grinding out that dimpled keyway that aligns the tube with the notched socket shaft. Of

You had a weak 1500B. Its a far better tube and for sure will make more power. I have swapped these many times. C ________________________________ Sent: Sunday, November 26, 2023 4:26 PM To:

Rudi was clever. He had the socket centre pin modified to take the Eimac tubes and put a 6V tap on the transformer in the DX-2SP amplifier. I have tried both the 4CX1500B and the 4CX1000A in a

If an amp uses FU728 by design and has an actual 728 socket stem, a 4cx1000 will not just fit in. The center shaft is too wide in diameter. ?It may be possible to enlarge the center hole on the

Looking for a good working transformer. ?Any one of the three. ?Send email direct to me , gudguyham@.... ?Thank you. Sent from the all new AOL app for iOS

I'm wondering if a CM choke, right at he input of the xcvr might help ?? ?I have 2 x spare CM chokes....so? could put one at output of xcvr.... and 2nd one at input of amp.

Jim, They are engraved plastic labels. Hal

Hi Mike,? Again, SWR does not change along a coax unless the coax has loss.? If you put the SWR meter anywhere in the coax between the rig and the amp, the SWR should read the same.? Sometimes,

What is the name for those labels used on that tuner ??? ?I have seen em white on black,? white on blue, and white on red.? ?Used in industrial commercial applications.

I don't buy that for one second.? ?SWR won't change at all with different line lengths.? Only the R / X? will change, but swr remains the same.? ?Having said that, with real long lines to ants,

Interesting, not familiar with those tuners, thanks for the info Hal. Actually thinking further about it, whilst reflected voltage would change along the line not sure if the ratio to forward would

Dear Mike, The ETO/Alpha AC-77 antenna tuner has a Bird wattmeter right in the chassis, with a front panel slug socket. [cid:image001.jpg@...] John Bliss adopted that idea into his

Thats interesting Bill, I guess VSWR read by an SWR meter varies along the length of coax because of the changing impedance / voltage ratio, but the actual SWR does not. I am currently building a GG