On Wed, 25 Feb 2009 13:54:03 -0800 (PST), b
put finger to keyboard and composed:

On 25 feb, 21:06, Franc Zabkar wrote:
On Wed, 25 Feb 2009 04:32:14 -0800 (PST), b
put finger to keyboard and composed:

this is a 33v stabilizer from a 14" tv set

Are you sure?

The following forum thread suggests that the PH-33J is equivalent to
the BYD33J, in which case your diode is not a "stabiliser":http://www.forumnow.com.br/vip/mensa...topico=2630665

This site lists it under Schottky diodes:http://chinaimportexport.wikispaces....nufacturer+Sto...

Confusingly, this stock list shows a PH-33V as a 33V 1W part:http://www.rccomponent.com/class-121.pdf

Thanks a lot for all the info. Hmm, looks like it may not be the right
thing.

Yes, this is in the 33v line to the tuner of the TV. it is replacing a
TAA 550. (symptoms: set searching but not finding anything, just snow.
Tuner supply down to about 5v)
not only that, but I fitted it this afternoon and tried the set, I got
a picture but tuning lock was unsteady especially when channels were
changed. To my surprise I measured some 50v on that line instead of
the usual 30v!
Obviously something is amiss. Apparently I can use a KA33V stabilizer
in lieu of the TAA 550, so I'll get one and see.

-B

The 33V supply is probably derived from a rectified 50V pulse from the
flyback transformer. It most likely consists of a rectifier diode,
capacitor, series resistor, and the TAA550 33V precision zener.

If a reverse biased rectifier diode were installed in place of the
original TAA550, then the full 50V would have appeared on the supply
rail.

- Franc Zabkar
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