Filament voltage ?

[fdegrove]

Hi,

I learned this from an old master who engineered tubes at Mullard. Better stick to their wisdom.

Ir. van Mossevelde?

I suppose we have the same source of wisdom, Guido: Audio Discussions as published by A&T...
IIRC you were present when this was discussed among other related topic.

My documents from Belgian Philips licensee MBLE confirm this BTW.

Tube life decreases drastically once below 6.0V (in the case of E type tubes).

When nominal heater voltage is 6.3V going below 6V doesn't allow for the cathode to reach operational temperature and causes cathode poisoning.

Cheers,

[Guido Tent]

Hi Frank

All correct, I initiated that talk

Pitty it is noty available in English. Lot of work to transalate.........

cheers

[fdegrove]

Hi,

Guido,

Pitty it is noty available in English. Lot of work to transalate.........

I wouldn't mind doing the translation of the document or at least a decent summary of it.
Knowing you have been an actual witness would be a great plus as some of the taped stuff is rather err....funny.

Either way, if you're interested just let me know and I'll schedule it for one of our long winterdays...

Cheers,

[Guido Tent]

Originally posted by fdegrove
Hi,

Guido,



I wouldn't mind doing the translation of the document or at least a decent summary of it.
Knowing you have been an actual witness would be a great plus as some of the taped stuff is rather err....funny.

Either way, if you're interested just let me know and I'll schedule it for one of our long winterdays...

Cheers,

Hi Frank

That would be great, however the copyright is at Audio en Techniek so we have to discvuss with them

cheers

Guido