ECC99 Heater / Cathode Max Volt

Peter Menting · 22nd July 2004, 01:59 AM

Does anyone have the heater / Cathode max Voltage for this tube, I am using it in an SRPP and will have 150 Volts on the plate of the lower tube.

Pete

Eli Duttman · 22nd July 2004, 03:50 AM

Unfortunately, JJ's spec. sheet doesn't say anything about heater to cathode voltage. My seat of the pants reaction is to float the heater supply, regardless of whether it's AC or DC, and bias the heater off the B+ rail with a voltage divider at about +70 V.

dshortt9 · 22nd July 2004, 04:47 AM

For what it's worth this site claims U k/f to be 200v.

http://www.musicolar.ch/JJECC99.htm

Peter Menting · 22nd July 2004, 12:15 PM

Thanks for the responses.
That 200 Volt figure is impressive if true, but I believe that I will take Eli"s advise and bias the heaters to 70Volts just to be safe.

Pete

dshortt9 · 22nd July 2004, 06:24 PM

Tubes of this type specify about 100v static c-f and 200 v ac. The E182CC may reach 200v static. The best I've seen is the 6H30 which is an impressive 400v. No need to bias the heater on this one.

fdegrove · 23rd July 2004, 12:29 AM

Hi,

Quote:

That 200 Volt figure is impressive if true, but I believe that I will take Eli"s advise and bias the heaters to 70Volts just to be safe.

It's only impressive if interpreted the wrong way: Vk/f 200V means with a heater 100VDC positive with respect to cathode, total DC and peak would be 200V.

With the heater negative with respect to the cathode total DC and peak is again 200V.

A lot of people misread this kind of data completely when the numbers are reversed, i.e. cathode more positive than heater and take the wrong measures.

Cheers,

22nd July 2004, 01:59 AM	#1
Peter Menting diyAudio Member Join Date: Jul 2003 Location: Blackstone VA	ECC99 Heater / Cathode Max Volt Does anyone have the heater / Cathode max Voltage for this tube, I am using it in an SRPP and will have 150 Volts on the plate of the lower tube. Pete

22nd July 2004, 03:50 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Unfortunately, JJ's spec. sheet doesn't say anything about heater to cathode voltage. My seat of the pants reaction is to float the heater supply, regardless of whether it's AC or DC, and bias the heater off the B+ rail with a voltage divider at about +70 V. __________________ Eli D.

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22nd July 2004, 04:47 AM	#3
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	For what it's worth this site claims U k/f to be 200v. http://www.musicolar.ch/JJECC99.htm

22nd July 2004, 12:15 PM	#4
Peter Menting diyAudio Member Join Date: Jul 2003 Location: Blackstone VA	Thanks for the responses. That 200 Volt figure is impressive if true, but I believe that I will take Eli"s advise and bias the heaters to 70Volts just to be safe. Pete

22nd July 2004, 06:24 PM	#5
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	Tubes of this type specify about 100v static c-f and 200 v ac. The E182CC may reach 200v static. The best I've seen is the 6H30 which is an impressive 400v. No need to bias the heater on this one.