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Old 22nd July 2004, 01:59 AM   #1
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Default 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
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Old 22nd July 2004, 03:50 AM   #2
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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.
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Old 22nd July 2004, 04:47 AM   #3
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For what it's worth this site claims U k/f to be 200v.

http://www.musicolar.ch/JJECC99.htm
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Old 22nd July 2004, 12:15 PM   #4
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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
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Old 22nd July 2004, 06:24 PM   #5
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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.
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Old 23rd July 2004, 12:29 AM   #6
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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,
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