When I formed the group, my intent was to cover all the MFJ related brands, but a group name would be too long to cover them all. This is a question about matching 811As without a tube tester with the intent of using them as spares in an Ameritron 811H amplifier.
I do not have a tube tester but I am hoping to find someone in south central Ohio who does have one.
I would like to find a way to test 811As without buying a tube tester if I can't find one nearby. And some tube testers don't do thorough tests anyway.
Can you use an 811A in an amplifier circuit at low drive after neutralization to check tube parameters in order to match a set of 811As for use at higher power?
I have an Ameritron 811H. Eventually I will replace these 811s with matched 572Bs. In the meantime, I have 9 spare 811As, Six were purchased together and appear to be from the same lot, from the same shipping box. Three others were given me when I bought the amplifier. I was told it's not all that important to match these, but I would think otherwise. I was hoping setting up a few in the amp, maybe just one, using low drive level, might give me what I need to know from either voltage or current measurements on the Ameritron's meters.
Maybe there's a special rig I can build just for testing these and 572B tubes for this purpose?
Thoughts?
Donald KX8K
