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572b Tubes - hard to find quality & supply
- Thread starter BoxHillBoy
- Start date
Partly determined by drive power and the design of the amplifier you use. They are not all created equal.
73
Radio is rated 100w so SSB where the amp will be used it will be pushing 60w to 80w peak im guessing
TY
I just picked up a AL-572 amp for pennies, working. Now i know where to get a fresh set of tubes for it.
Jeez, it's not rocket science. Load up 811a's and tune with a TOF module. If you can monitor peak grid current, you can get maximum output along with the cleanest signal, all while keeping the tubes happy.
BJ radionut
Supporting Member and 6m addict
I have had an AL-811H for almost 10 years now, the original tubes where old Taylors junky, burned up, grid resistors had fell off the sockets in the amp blah blah the amp was in a really sad but complete state. After cleaning up and repairing the amplifier (grounding the grids directly too) the last place I purchased 811A tubes from was D&C Electronics (FL), they were made in China, 10 tubes was like $200, like 10 years ago.
I sold/gave away all the extra new tubes, I am still running the 4 China made tubes from D&C. I used to run the amp hard to 800 watts, but after learning that slapping the F out of that Grid Current Meter wasn't good, I dialed it back to about 500-600 watts, and it has lasted nearly 10 years, still full output, and for 4 years I did almost all FT8 (carrier mode!). I think Ameritron may have gotten their tubes from them, same thing, unlabeled Generic China 811A's. I do not think D&C is still same business they have merged with Richardson, (rell.com) who is a supplier and rebuilder of tubes for the commercial market.
I sold/gave away all the extra new tubes, I am still running the 4 China made tubes from D&C. I used to run the amp hard to 800 watts, but after learning that slapping the F out of that Grid Current Meter wasn't good, I dialed it back to about 500-600 watts, and it has lasted nearly 10 years, still full output, and for 4 years I did almost all FT8 (carrier mode!). I think Ameritron may have gotten their tubes from them, same thing, unlabeled Generic China 811A's. I do not think D&C is still same business they have merged with Richardson, (rell.com) who is a supplier and rebuilder of tubes for the commercial market.
To get a quote from Richardson for 811A tubes go here. No idea what the price or minimum quantity is these days.
https://www.relltubes.com/products/Electron-Tubes-Vacuum-Devices/Triode/811ANL.html
https://www.relltubes.com/products/Electron-Tubes-Vacuum-Devices/Triode/811ANL.html