application for ccs/gyrator board from the groupbuy

Jaap · 16th July 2011, 08:46 PM

Anybody a suggestion for how to use this board for a 76 tube ?

see schematic

Ryssen · 17th July 2011, 05:14 PM

I´m Interessted in this myself,but your picture doesnt expand so I´m making a link.

PCB for cascoded IXYS CCS (tube)

Alastair E · 18th July 2011, 12:59 PM

Seems terribly complicated.....

Is there any advantage over a more simpler design?

Michael Koster · 18th July 2011, 02:25 PM

The circuit is a simple two device cascode. There are two of them on the board plus optional bias regulators for constant voltage "gyrator" operation. Reading through the thread will clarify the purpose of the various options.

This application of this board for a 76 tube depends on what you want to accomplish. Let's say you want to use the 76 as a single stage line amplifier with a gain of about 14x.

The 76 has a relatively high plate resistance, and one wants low output impedance from a line amp, so I would use the circuit as an anode load with the mu output.

For a single stage amp using a low gm triode, either CCS or gyrator would be appropriate. One might try both to see if there is a difference in sound or stability.

18th July 2011, 12:59 PM	#3
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Seems terribly complicated..... Is there any advantage over a more simpler design? __________________ Das Beste Oder Nichts

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17th July 2011, 05:14 PM	#2
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	I´m Interessted in this myself,but your picture doesnt expand so I´m making a link. PCB for cascoded IXYS CCS (tube)

18th July 2011, 02:25 PM	#4
Michael Koster diyAudio Member Join Date: Jan 2008 Location: Bridgeville, CA	The circuit is a simple two device cascode. There are two of them on the board plus optional bias regulators for constant voltage "gyrator" operation. Reading through the thread will clarify the purpose of the various options. This application of this board for a 76 tube depends on what you want to accomplish. Let's say you want to use the 76 as a single stage line amplifier with a gain of about 14x. The 76 has a relatively high plate resistance, and one wants low output impedance from a line amp, so I would use the circuit as an anode load with the mu output. For a single stage amp using a low gm triode, either CCS or gyrator would be appropriate. One might try both to see if there is a difference in sound or stability.

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