[ARC5] Tube Conditioning

[Dennis Monticelli]

Yes.  it is good practice to re-activate the getter so residual internal
gases that have built up over the years (due to mild seal leakage and
electrode outgassing) can be captured by the getter.  The getter needs to
get hot and the gases need to get in motion.  Filament alone is often
enough (several hours worth) but some plate dissipation (without
application of HV) helps the process along.

I replaced the finals in my TS-820 with NOS 6146B's and did not do this.
One of more of the tubes arc'd a couple/three times when I applied power
for the neutralization step.  No doubt these very brief HV-shorting arc's
blasted off some cathode....not good.  I have since learned my lesson.

Dennis AE6C



On Thu, Jan 15, 2015 at 11:14 AM, Robert Eleazer <releazer at earthlink.net>
wrote:

> I have a set of five NOS 6883B's in an original sleeve I bought on ebay.
> Total cost including shipping came to about $5.00 per tube.
>
> I want to use two of the 6883B's in a TS-520 I am repairing and have
> modified for 12V parallel filaments.  I understand that it is a good idea
> to crank up the filaments and apply some B+ to condition those tubes for a
> bit before use.
>
> Can anyone explain that process again?
>
> Thanks,
>
> Wayne
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