Sonics of a "dynamic coupled" driver

korneluk · 28th March 2008, 11:18 PM

Folks,

Never having heard one of these I'm left wondering if there are any big pluses or minuses to the sonic quaities of a "dynamic coupled" driver.

http://www2u.biglobe.ne.jp/~tossie/M808-E.html

-- josé k.

kmaier · 29th March 2008, 12:23 AM

Yes, great site, lotsa nice gear too. I've see similar designs using transmitter tubes (I have a nice pair of 808's as well, could buy them NOS JAN army surplus for 95 cents when I was a kid). These tubes are designed with positive grid drive as normal operation so you have two choices, get a driver transformer or the use the dynamic coupled approach. Effectively a class A2 amplifier.

Not sure about pluses and/or minuses... but the dynamic coupled circuit has to keep the grid positive at all times otherwise the driver stage goes into cutoff (probably a minus). It does allow for much lower voltages than the tubes are normally operated at (certainly a plus). Still, I think a transformer driver setup should be better but the cost is much higher.

If you look at the tube data sheet linked here:

http://tdsl.duncanamps.com/link.php?target=002598A9

You'll note that 300 watts output is capable under ICAS conditions... but around 200 watts is good for CCS operation with class B operation.

Regards, KM

28th March 2008, 11:18 PM	#1
korneluk diyAudio Member Join Date: Jan 2005 Location: South Florida	Sonics of a "dynamic coupled" driver Folks, Never having heard one of these I'm left wondering if there are any big pluses or minuses to the sonic quaities of a "dynamic coupled" driver. http://www2u.biglobe.ne.jp/~tossie/M808-E.html -- josé k.

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29th March 2008, 12:23 AM	#2
kmaier diyAudio Member Join Date: Jul 2007	Yes, great site, lotsa nice gear too. I've see similar designs using transmitter tubes (I have a nice pair of 808's as well, could buy them NOS JAN army surplus for 95 cents when I was a kid). These tubes are designed with positive grid drive as normal operation so you have two choices, get a driver transformer or the use the dynamic coupled approach. Effectively a class A2 amplifier. Not sure about pluses and/or minuses... but the dynamic coupled circuit has to keep the grid positive at all times otherwise the driver stage goes into cutoff (probably a minus). It does allow for much lower voltages than the tubes are normally operated at (certainly a plus). Still, I think a transformer driver setup should be better but the cost is much higher. If you look at the tube data sheet linked here: http://tdsl.duncanamps.com/link.php?target=002598A9 You'll note that 300 watts output is capable under ICAS conditions... but around 200 watts is good for CCS operation with class B operation. Regards, KM

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