That sure is a pretty tube! Way back in 1981 the EE students at CMU were adding LEDs to the base of those to use as decorations! Some got all extravagant and added 555 timers to make them blink. The orange leds were the brightest at that time.
It's often the little things we overlook, and there's no shame in getting a second (or 3rd, 4th, 5th... 🫡) point of view. So glad it's working now, and I think the addition of the keying board and red transmit light are great enhancements!
Awesome job! Hey, could you do a video on testing coils on old receivers. I have an S-40 B and band 4 is out but I don’t know how to test it. I also don’t know which tool would be best to test it with.
To make it simple, The linears power supply is 1600vdc. 1625 tubes are rated max of 750vdc. The 572B can handle 2700vdc. Plus the 572B can conduct the required current by itself!
Hi just wondering about the filiment chock the very same one is used in the Heathkit SB200 and there is artical on the SB200 and it was calculated that the chock is 10uh and to low in value for 2x 572b on the 80m band and should be at least 20uh. I have a SB200 and changed out the chock for a ferrite ring FT240/31 and using 14 awg wire wound 14 turns which gives me .25mh and works great
Great Job Terry! The UA-cam community is a great asset.The owner is going to be happy!
Happy new year Terry from Spain. cheers!
That sure is a pretty tube! Way back in 1981 the EE students at CMU were adding LEDs to the base of those to use as decorations! Some got all extravagant and added 555 timers to make them blink. The orange leds were the brightest at that time.
It's often the little things we overlook, and there's no shame in getting a second (or 3rd, 4th, 5th... 🫡) point of view.
So glad it's working now, and I think the addition of the keying board and red transmit light are great enhancements!
Awesome. I read all the feedback comments from part 1. Great learning opportunity for me. Glad you got it running right.
Happy New Year, Terry!
I wish you a happy new year 2024!
Happy new year, D (et all)!
Happy new year from France, and 73s QRO
Amazing work, as always, sir!
Gretings!
Awesome job! Hey, could you do a video on testing coils on old receivers. I have an S-40 B and band 4 is out but I don’t know how to test it. I also don’t know which tool would be best to test it with.
Super video on a rare amp. can you explain why using 572 over the 1625 tubes? thanks Mike
To make it simple, The linears power supply is 1600vdc. 1625 tubes are rated max of 750vdc. The 572B can handle 2700vdc. Plus the 572B can conduct the required current by itself!
Hi just wondering about the filiment chock the very same one is used in the Heathkit SB200 and there is artical on the SB200 and it was calculated that the chock is 10uh and to low in value for 2x 572b on the 80m band and should be at least 20uh.
I have a SB200 and changed out the chock for a ferrite ring FT240/31 and using 14 awg wire wound 14 turns which gives me .25mh and works great
Thank you for the info. I will test at that frequency and see how the amp responds
Bravo you created a novice gallon. Cheers! 🍺
It would make a great guitar amp!