[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[TCML] Negative bias in a VTTC



Hi all.
A friend of mine have problem with  grid leak network of a single 833 VTTC. He started with a 5k resistor and have increased its value reaching over 25k, but with a MOT without doubler, he has always the plate very red.
I noted that triodes have different plate current value with 0V biased grid independently from the power of the tube: 811A is very simple to bias at 0V because the plate at 2000V reach only 20mA of plate current from the curves, otherwise 833 drain 500mA from plate, with grid  biased at 0V and with 2000V on plate.

Had anyone made test with grid leak resistor connected at a variable dc or 'in phase' ac and grid leak capacitor grounded?

Cheers

Vladi

________________________________



Vladimiro Mazzilli

Ricerca & Sviluppo
Aros
Via Somalia 20
20032 Cormano (MI)
Tel. +39 02 66327266 - Fax. +39 02 66327528
Skype Id: - VoIp:
E-mail: V.Mazzilli@xxxxxxx
Web: www.aros.it<http://www.aros.it>
 -----------------------------------------------------------------------------------------------------
Per favore non stampare questo messaggio se proprio non ? necessario
Please consider the environment before printing this e-mail
-----------------------------------------------------------------------------------------------------
Chi riceve il presente  messaggio e` tenuto a verificare se lo stesso non gli sia pervenuto per  errore.  In tal caso e` pregato di avvisare immediatamente il mittente  e,  tenuto  conto  delle  responsabilita` connesse  all'indebito utilizzo e/o  divulgazione  del  messaggio  e/o  delle  informazioni  in esso contenute,  voglia  cancellare  l'originale  e distruggere  le varie copie  o stampe.

The receiver  of this message is required to check if  he/she has received it erroneously.  If  so,  the  receiver  is  requested to immediately inform the sender and - in consideration of the responsibilities  arising from undue use and/or disclosure of the message  and/or  the information contained therein - destroy the original message and any copy or printout thereof.



_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla