These last two videos have been perfect timing. Working on getting a new AL-811H on line.
@DonDegidio2 жыл бұрын
Hi Jim, Hope you are doing well. Thanks for the refresher. I think it was in the 90's last time I tuned up the SB-221. Shouldn't be much longer it will be back on the air as an SB-220. Stay safe. 73 WJ3U
@chriskieffer6745 Жыл бұрын
I wish I could find a video or someone tell me how to adjust my sb220 my technician died and I have never ran one before.
@MrTalaue Жыл бұрын
I always tune plate for maximum grid current and load for maximum output within the specified limits for those currents. With tetrodes for maximum screen current of course.
@nikonman39715 ай бұрын
Your the Man on the Bands, Thanks Jim
@BMGBOX2 жыл бұрын
Thank you for this and other great videos, Jim ! - Bob (VA1BOB)
@ww3ok2 жыл бұрын
Excellent and interesting video. Thanks, Jim.
@alanbrown47662 жыл бұрын
"Sincerely Yours" From W1VTP, Al. The answer to your question is no - but there is a procedure as delineated by Jim that *must* be followed to reduce distortion products (some say 'splatter' - I don't agree with the term but an adjacent 'channel' user, splatter fits the bill. I follow Jim's approach - feeding the output into a 50 ohm termination that is built for the job. A final thing I do is using a scope that has a trapezoid mode - I transmit a full power signal with an extended "FIIIIVE', 'SIIIIX' while watching the trapezoid pattern. The unparalleled lines should be straight with no bending at the top of the trace. Any bending of the lines should be either a biasing or more likely a non-linear output due to a bad tuning sequence and the whole procedure might have to be done. I have achieved greater than 1,500 watts on my termination with a pair of 3-500ZG's. Jim could done things slower but watch his original video that goes into more detail. I have normally achieved > -50 dB/ full output on my distortion products on my amplifier.
@ralphmowery289810 ай бұрын
My L4B puts out about 1200 watts when tuned. While the 3-500 tubes will put out more power safely many of the older amps were designed when the input power rule was 2000 watts and that meant the output would seldom go much over 1200 watts. The plate voltage of that era was the limiting factor. The 3-500 needs 3000 or more volts to put out the power. To be legal back then for SSB you had to tune up on the antenna on the low voltage setting and then switch to the high voltage for SSB and not retune.
@jvmlc42 жыл бұрын
Hi... I'm a Spanish follower of yours. I have a request. you could make a video about the equalization parameters of the equipment with the micro. Cheers
@amateurshooter60542 жыл бұрын
Thanks Jim
@cwebs10002 жыл бұрын
Can you tell me why some hams sound tinny or slight echo when running Hi power amps? 73 Carl
@ham-radio2 жыл бұрын
Some times there is more than one path. Some times the amp, even at low power, has huge IMD issues and distortion due to poor tuning and overdriving. Some times they are using tons of processing. 73, Jim
@sincerelyyours75382 жыл бұрын
Interesting. Does it appear to be rather finicky or is that normal when tuning these amps? Also, are you keying a mic or something in short bursts to keep the amp from delivering constant max power, or is that an effort to keep the dummy load from overheating, or both? Sorry for the newbie questions - it's because I are one. ; )
@bobrunge75942 жыл бұрын
Interesting to see. Thanks , Jim Bob Runge W1LSZ
@RadioMan6662 жыл бұрын
Thanks Jim for the great primer and review for us lazy suckers who use auto tuners and amp.