500 Vcc comp. pair

[Louis Kendall]

I normally use MJE 340/350 for HV power amps but they are only good to
300V. This time I am running 450-500V rails.

What is the next logical step up in voltage using the most commonly
available part, and preferrably not TO-3?

Desired bandwidth is 10KHz to 2MHz.

Thanks for any advice.

Louis Kendall

 

[Phil Allison]

"Louis Kendall"

I normally use MJE 340/350 for HV power amps but they are only good to
300V. This time I am running 450-500V rails.

What is the next logical step up in voltage using the most commonly
available part, and preferrably not TO-3?

** A noval or octal base valve is good at those voltages.

Triode or pentode......

Desired bandwidth is 10KHz to 2MHz.

** Consider mosfets.

600 and 800 volt ones are common.



......... Phil

 

[Boris Mohar]

I normally use MJE 340/350 for HV power amps but they are only good to
300V. This time I am running 450-500V rails.

What is the next logical step up in voltage using the most commonly
available part, and preferrably not TO-3?

Desired bandwidth is 10KHz to 2MHz.

Thanks for any advice.

Louis Kendall

http://eportal.apexmicrotech.com/mainsite/products/linvoltage.asp


Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

void _-void-_ in the obvious place

 

[Wimpie]

I normally use MJE 340/350 for HV power amps but they are only good to
300V. This time I am running 450-500V rails.

What is the next logical step up in voltage using the most commonly
available part, and preferrably not TO-3?

Desired bandwidth is 10KHz to 2MHz.

Thanks for any advice.

Louis Kendall

Hi Louis,

I don't know exact details about your current topology. If you can use
a topology that uses NPN transistors only (or N channel MOSFETS), you
can use high voltage deflection transistors (for CRT monitors/
television) or high voltage IGBTs.

I can imagine that this doesn't solve the bias issues, so probably
there will be some trade-offs. In case of BJT's, bias current will be
higher because of low HFE.

Also current sources (with PNP) require different design (series
circuit).

Best regards,

Wim
PA3DJS
www.tetech.nl