2C51 is same as 5670, 408A is same as 6AK5 but with a 20 volt filament. You will need to adjust filament voltage to 20 on your tube tester, 407A is same as 2C51 but again with 20 volt filament.
Even if you can't test these tubes they will most likely be ok if the filament is good.
Norm
:Hi,I have three western electric tubes,and I dont know how to test them,they are JW-2c51,408A,and 407A,can anyone help? thanks