Fuchs Replay Jr Question (9VDC to 300V)

[mykaitch]

In the old days a car used a contact breaker (points) which in effect made it AC like.
TVs used to use around 200-350vDC HT, through a flyback transformer to get 25kV,so the HT is actually switched like the points.
Blackstar do much the same with a 500uH coil and an osc. Really you can get about any voltage you like from another.
I use  an ignition coil run by a 555 timer to keep cats away.
What you can't do is take DC and simply pump it up--it has to be switched somehow.
PS Fault fixed, MOSFET runs cold

[lead2203]

I'm not looking for a schematic or anything like that, I'm just wondering how the heck they convert 9VDC to 300V. Anyone know how they accomplish that?

http://www.fuchsaudiotechnology.com/products-plush-detail.php?id=00_tube_delay_replay

A link in the "Slicing Bread"-thread leads to the:
"Twin Powers" (see: reply#4), mentioning the:
"Sky-Hi"-circuit,
which lends itself to creating high supply voltages for various purposes like explained in the:
"PMPS", and the:
"Head-Ex"-threads...
(b.o.m. here...)

this way doesn`t cause such awful disharmonic waveform-spikes in the power-supply...


Also useful for here...

May be its just me but , I'm having a hard time fallowing you're ideas... because of the way you skip all over the place..go to these 4 or 5 threads thing... It makes it hard to wrap my head around this... Is there one thread to get the basic idea? It seems very interesting.

[J0K3RX]

This post is kinda old. You are not the only one having a hard time following puretube...  look at post 7 bout sums it up.