Re: New to the List and pulsed DC-VTTC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 10 Oct 2007 14:35:06 -0400
From: futuret@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: New to the List and pulsed DC-VTTC (fwd)


Martin,



Thanks for that further info.



I did some work with pulsed DC VTTC's using tetrodes

as a low-powered test with the idea of building a higher

power system.? The tetrodes made it easy to implement

the staccato mode by pulsing the screen grid with raw AC.

I'll be looking forward to your results.



John


-----Original Message-----
From: Tesla list <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Fri, 5 Oct 2007 10:53 am
Subject: Re: New to the List and pulsed DC-VTTC (fwd)





---------- Forwarded message ----------
Date: Fri, 05 Oct 2007 16:01:02 +0200
From: Martin Damev <mdamev@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: New to the List and pulsed DC-VTTC (fwd)

Hello John,

Thanks for your interest. The grid-pulsed DC-VTTC
was conceived mainly because of the idea to use
multi-kilowatt transmitting triodes (or tetrodes)
for a large VTTC. I think that there are limitations
to the commonly used AC-VTTC with staccato when
used with tubes that have for example ten times the
output power of a 833 tube. The main drawbacks
being a bad power factor and high current pulses
that have to be delivered by the ac mains and the hv
plate transformer.
Using a DC-VTTC the power factor would be much better
especially when using a three phase HV-transformer
and six-pulse bridge rectifier for charging the storage
capacitor.

Some interesting research will be needed in the future
to gather more experience with pulsed DC-VTTCs
but I really want to share my results with anyone interested
in tube coils. As I stated the grid-pulsing unit I use came
out of an 12 kW-RF generator. It's electronic design is almost
30 years old. Nowadays it can be made more compact
using modern IGBTs and integrated igbt drivers.
I plan to design a modern version of the grid-pulsing unit
as soon as possible.

I will try to put some pictures, text and schematics on the web as
soon as I can. What is the best way ? I thought of myspace.



- Martin















________________________________________________________________________
Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com