Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
----------------------------------------------------------------------
DW -
The only procedure that I have seen that makes any sense is to apply
filament voltage ONLY for a few hours (2-4) before applying operating
voltages.
All metal to glass seals leak to some extent, and 20 - 30 years is a lot
of leakage, even if only an atom or two at a time! Applying filament
power will heat up the getter installed in all vacuum tubes and allow it
to do its job of scavenging up loose oxygen and other bits that have
migrated in over the years. The getter is "flashed" as part of the
manufacture of tubes, so just filament power won't get it as hot, but
hopefully you're only grabbing a few atoms. I suspect the increased
filament power would be a way of getting it hotter, but to me the
trade-off of overstressing the filament isn't worth the possible extra
efficiency.
In any event, running with filament power only for a few hours certainly
won't hurt good tubes!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
DW Holtman wrote:
Hello,
Just wondering on the thoughts of this group on the best way to burn
in a new pair of 6BJ6's for a T-4B transmitter. Have heard several
ideas in the past, ranging from applying filament voltage for a few
days to increasing filament voltage 20% over for a short time. Any
good thoughts, and the reason behind them?
Best,
DW Holtman
WB7SSN
----------------------------------------------------------------------
Submissions: [EMAIL PROTECTED]
Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body
Hopelessly Lost: [EMAIL PROTECTED] - help in body of message
Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net
----------------------------------------------------------------------
