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I have seen many engines go 300,000+ with just regular oil changes and cheap oil that I don't think additives are ever needed with the exception of older cars that have flat tappet cams, then a zinc additive MAY help cam life. The undercoating spray is a good idea in the rust belt, I use...

It will not boil a battery dry, my F150, Explorer, Fusion all charge at 14.5 - 14.9 volts. The F150 just had a 12 year old battery changed, the last battery in the explorer was 7 years old when changed.

Look into disabling the battery management system. On my fords, this will drop the charging voltage it 12.9 on long trips, with it disabled the charging voltage stays at 14.8 all the time.

2 HP server supplies modded and it parallel will make 150+ amps for less than $100.

I run legal limit+ to a non resonant ladder line fed doublet on 10 - 160 and have had zero issues with RF in the shack on any of the bands. An ATR-30 tuner keeps the linear happy. This antenna hears good and gets out really good. The only band I need to be cautious on is 160 as the feed line...

I initially put up an IMAX 2000 without the ground plane kit and I was getting into the neighbors garage stereo. This is on a 10ft mast, (about 23 feet to the base of the antenna) on top of the garage with a good ground system under the entire area. After installing the ground plane kit, I am...

The input and passthrough tune will be different so that's probably why you are seeing different readings. Like undertaker said, anything under 2.0-1 is fine. If you are driving your amps within an inch of their life you'll want to have lower SWR, otherwise up to 2.0-1 doesn't affect your...

You get it. I run ham, CB, murs, gmrs, radio is radio period. I simply chose not to be tied to one frequency or service.

Likely grounding through the coax shield

Both of my Lincoln 2+ radios had horrible receive when talking local, it didn't matter if the local station was the same or less on the S meter as DX, they sounded terrible, like a non biased amp was being used on the TX side x10. I sent both of them to 350 radio in Georgia and he slowed down...

I made my post based on the positive interactions a couple of local guys have had with Scott. I have not done business with him personally. Based on the reactions I'm missing something, fill me in.

Good news! Scott, (amprepairguy.com) is taking over Harbach!

Dam, this sucks, hope Jeff gets a few decent years of retirement. I just ordered SB220 parts a couple of months ago from him. Hopefully someone else keeps it going so parts are available for these old amps.

Thank you nomad for answering my questions!

The tube duct diameter is slightly larger than 3.25, so I'll use that dimension to be conservative. The velocity measured with my wind wizard 1/2 inch away from the tube duct outlet is 3.6 MPH, 6 inches away from the duct outlet velocity is 2.8MPH so again I'll use the conservative number...

The temp sensor is directly in the air stream off the tube so the temperature likely isn't dropping much at all. I don't know the volume of air, I'll measure the velocity tonight and calculate the CFM. It's the stock AL-1500 blower on high speed.

What is the maximum safe exhaust air temperature I should see off of a 3cx1500a7 in a AL-1500? This amp has tube stack mod to keep the band switch and tank circuit area cooler, plus the fan is on the high speed setting. Also running @ 4000 volts on the plate with the upgraded 10 capacitor...

They will do impressive meter numbers, I have never seen a C box that wasn't starting to spread out by the time it reached 150 watts per pill.

There is a stud mount version of the Performer 5000, I have one and posted a link to it above. RG58 will handle far above 400 watts, I have run 1.5KW through it for extended periods. (If you want zero coax issues in a mobile use RG400) The real limit is mag mounts, I have never seen one...

Definitely. I drive a 8 pill with 90 watts and that's pushing the 8 past linearity.