• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Which tube Rectifier is good enough for 5902 tube amp ?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
kevinkr

kevinkr

Administrator
Joined 2004
kta-hifi.net
Paid Member
Nothing that I am aware of really other than the types used in tube tektronix scopes intended for very low current HV rectification for CRTs.

If compactness is the issue then UF4007 diodes are probably a good compromise otherwise the 6X4 would seem to fit the bill.. Another option could be to diode strap something like the 6021 dual triode, keeping in mind that its performance as a rectifier might not be the best, and its peak current rating would probably be miniscule - you'd have to characterize its behavior in such service, and it would be hard to guess how long it would last in such an application.

One other thought might be the 6AL5, again watch out for its ratings! (Dual diode good for a few mA at 100V or so)
 
E

Eli Duttman

Member
Joined 2004
A look at the 5902 data sheet indicates that upwards of 60 mA. of B+ will be needed by 2X SE "finals". The 6X4 is rated for 70 mA. You might not have enough left to energize the small signal circuitry. :( IMO, you need a rectifier with bigger "cojones" than the 6X4 has. The smallest physical package that fills the requirement is the 6V4/EZ80. The Loctal based 7Z4 is physically bigger than the 6V4, but it's inexpensive and will allow for a 100 mA. B+ draw.

Cathode stripping is a complete non-issue at this low a B+ value. Schottky diodes are as quiet as vacuum diodes and that seems to be the best choice to me.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom