Discussion in 'Amateur Radio News' started by KM9G, Jul 7, 2021.
All knobs to the right TO!
life,s to short for qrp...
No, Just no.
I endorse this message. And also use an amp saver. Your tube(s) will thank you.
Yeah, I always spike the plate and tune for the bump so Bird Watts are at the max. "If the lights ain't dim'n..... you ain't pinn'n" Soon exams will be a matter of copy & paste and be sure to grab your participation trophy when exiting the Mc Donalds Playscape VE session.
Tom's (W8JI) webpage should everybody with a tube amp read, that's all for right tuning and tube long life!
Nobody really needs these most time bad made Youtube videos...
There are so many artificially lengthened up to get quotes never coming to the real points which count, it's a shame.
73 de Chris DL6SEZ
When a linear amp is fully loaded, a plate current dip can be very difficult to see. However, tuning the PLATE for a grid current "peak" (not a dip) results in resonating the plate tank exactly as well and is usually easier to see. And adjusting loading while watching output power and grid current allows one to set it properly.
Tuning an amp with fragile grids, or tuning a tetrode or pentode amp for "max output" by adjusting the loading and watching only that can result in really short tube life.
This is a really good tip! I think I'm going to have to ruminate and practice a bit to fully grok it. One of the harder parts, so far, for me is that the amp has different efficiency on different bands - and this one seems to change its mind depending on the weather (I'm guessing ambient temperature issue)... so I don't know what "full power" input is yet as the target keeps moving. You're a level or 3 ahead of me here, thanks for the help!
I second the recommendation to watch W8JI's videos and consider getting his TOF tuning aid. It protects the amplifier from overcurrent on the grid and makes tuning MUCH easier and faster and shows you true grid current. I'm running the TOF on my 811H, literally just takes a few seconds to safely tune to maximum power.
Please be careful with this site! = McAfee is alerting on this containing a trojan.