Merz Donald S wrote:
The 2 supplies run two 3B28 rectifiers each. 3 of them run with no visible indication at all.
You can't even see the filament. But one gets a dramatic glow under load.
I have not seen this before--is that gas in the tube?
>
I hope so - 3B28s are supposed to have gas in them (some noble gas or a
mixture of them; not sure but I seem to recall argon). But seriously,
the fact that one is glowing more than the other might indicate a
problem with one of the tubes, not necessarily the one that glows more,
or a difference in the amount of current being handled between the two
tubes, which needs to be dealt with.
So with any luck I should have the rig on the air sometime in April. This will be the
highest power AM TX in my shack when it's done.
Can't wait to hear it (and I'm sure I will, if you're reasonably active
with it) and perhaps engage it/you in a QSO.
I'm slowly but surely working my way down the project list to the
restoration/completion of a homebrew 30's AM open relay rack
transmitter. Except this one will use 866As in the PS for that "trippy
blue glow."
73,
-Larry/NE1S
