"Dennis Monticelli" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- I put a couple of NIB 6146B's in my TS-820 a few years ago. These RCA tubes were purchased new (fresh stock) some 20 years previous. When I applied HV and began the neutralization procedure I heard a brief loud pop. The HV caps had been suddenly and momentarily discharged as evidenced by the lamps doing a deep flicker. The pop happened again later that evening after I had put it back on the op table. It did it once more the next day and then nothing ever since. I think either a plate to cathode or plate to beam-ormer ionization trail was the culprit. Had I run the filaments for a few hours before application of HV, the getter would have had an opportunity to scavenge the out-gassing that had taken place over the 20 years of sitting. Moral: HV tubes should have their getters exercised before application of plate. I wouldn't bother with stair-stepping up the filament. Just let them "bake" for a few hours to give the getters an opportunity to do their thing. I wouldn't bother with receiving tubes. It wouldn't hurt them either.
Denny AE6C On Dec 4, 2007 3:24 PM, DW Holtman <[EMAIL PROTECTED]> 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 ----------------------------------------------------------------------
