Re: Is there any reason no one can reproduce Ampliphone Vector Monitor Boards

I probably should have been a little more clear then. It is true that
the impeadence differences are very small when comparing horozontal
windings. But it's still enough to merit a boost in supply voltage to
make up the difference, you won't get away as easily on power demands
as you would on the vertical side of things. For example, I have a
yoke here measuring 80 ohms, in comparison to the g08 yoke measuring
about 1 ohm. Thats a difference of 80. This tells me to use this yoke
I need to increase the power output capabilities of the output stage
by a factor of 80. That is not a small number.

http://img329.imageshack.us/img329/4083/s2010005nq7.jpg

http://img216.imageshack.us/img216/2497/s2010018mp3.jpg

And the only real reason I pulled the high figure fresh out of my
head was my initial ambition to throw the chassis at a old g07 which
weighs in at about 50 ohms.

http://img515.imageshack.us/img515/7529/s2010008ni4.jpg

And to vaguely touch base on the power requirements, if I were to
hand wind a torridal to ramp up the supply voltage (take the AC +/-
35v rails (average)) to the grotesque numbers I would need to drive
that load with enough current necessary (and we won't even get into
the ridiculous slewing requirements at those voltages)
I would be losing current at the secondaries as exponentially as I was
doubling voltage. This would also far exceed the aloted power output
of the games stock transformer and start blowing fuses, thus sending
us back to the drawing board, and sourcing an expensive standalone
transformer. It would also force you to plug it into a 110 line.

Of couse thats all off the top of my head, and lacking some detail.
But the general idea is - it's a bad idea :D

Although I'm definatly open to discussion.

- Matt

On May 18, 6:06 pm, jrok <jrok...@xxxxxxxxxx> wrote:
In article Matty-t says...



On May 18, 12:30 pm, jrok <jrok...@xxxxxxxxxx> wrote:
In article Matty-t ays...

Most of todays yokes are up to 20x higher impeadence
then the vector yokes.

Really, that much difference ? I'm just interested in how you got
that value.

Is that a serious question? or did you just wave a bull*** flag at
me?

No, seriously. I'm looking at the yoke specs from one of the monitors
I've messed with, this was the 20" Korean made Happ ones. For the 3 possible
yoke ombinations, the specs were:

Lh mH 1.70
Lv mH 30.00
Rh ohm 1.73
Rv ohm 13.60

Lh mH 1.92
Lv mH 30.00
Rh ohm 2.00
Rv ohm 13.60

Lh mH 2.20
Lv mH 30.00
Rh ohm 2.20
Rv ohm 13.60

Cant' find the vector yokes specs to hand (where are the docs you want
when you want to reference them eh ?? ) but I was remembering the horz
windings were around 1ohm and 1.5mH.

Obviosuly the Vertical windings are going to be radically different
from a vector yoke, but I'm not seeing 20x different for the horiz
compared ot the vector yokes.

Why would modern horiz yokes have much higher impedence for horiz,
as they still need to be able to carry out very fast deflection
during the horiz retrace ?

- James

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