Re: 866a help
Inviato: 28 mar 2019, 09:27
bei tubi, e molto scenografici... ma rognosetti:
https://vinylsavor.blogspot.com/2011/08 ... -866a.html
http://www.uli.de/tubes/866a.htm
http://www.uli.de/tubes/83.htm
N.B.:
https://vinylsavor.blogspot.com/2011/08 ... -866a.html
http://www.uli.de/tubes/866a.htm
http://www.uli.de/tubes/83.htm
N.B.:
ATTENZIONE:Some operation requirements and safety hints applicable for all gas-filled rectifier tubes:
Preheating (the bigger and colder the tube, the longer, especially for Hg-filled tubes) is absolutely necessary, serious damage to the oxide coating will occur (erosion by heavy arcing) while applying high-voltage power if the filament is still heating up. Times are indicated in the different type descriptions. Operating Hg-tubes with reduced heating voltage will result in a non-reversible intoxication of the emissive layer, thus reducing lifetime of the tube drastically.
Generation of high-frequent (RF) noise by the arc igniting at each half-wave (what it does very rapidly, thus generating high spikes) is prohibited by inserting a small toroidal choke (1 mH or more) in series with each anode lead.
Gas rectifiers are a perfect choice for tube-HiFi-amplifiers, but changing over from high-vacuum or semiconductor rectifiers requires a very skilled technician - some startup and preheating circuitry must be added and - most probably - especially be developed first.
Comunque:[...] Mercury is HIGHLY TOXIC! Handle your tubes as cautiously as possible! Keep them out of your children's reach! Even one broken glass bulb might contaminate a room for years! Use Zinc powder (ask at your local chemist's) to absorb liquid Mercury in case of breakage - it will form a solid alloy with only small toxicity - an Amalgam. Burnt out Mercury rectifiers - if you don't want to keep them for display - MUST BE DISPOSED OFF PROPERLY! Ask for your local disposal of fluorescent tubes - these also contain mercury.
https://en.wikipedia.org/wiki/866AWikipedia ha scritto:Under normal operating conditions the tube glows blue and mercury droplets are visible.
) , devo dire che con il nuovo PS (vuoi per i tubi vuoi per gli induttori) suona davvero molto diversamente.
). Oggi forse propenderei per degli Schottky SiC. Ma magari i banali 1N4007 vanno benissimo ed è inutile mettere cose particolari... da provare. 