KT150's require 600 volts at the plate. If you are not able to supply that voltage, i cannot believe you would be getting the best SQ from this tube. Bigger question is whether the transformers on your amp will suffer?
Tube amp question
I am a novice tube amp owner. I have had my Black Ice Audio Fusion F22 for not quite a year. I want to understand plate voltage and how it impacts tubes or vice versa. I want to roll the tubes to the KT150's which Black Ice has said can be used without issue. The plate voltage of the amp is 500v. In other posts, someone said that KT150's require a minimum of 600v at the plate. Since Black Ice says their amp can use them, does this rating depend on the circuit? I have some basic understanding of electronic circuits and I googled plate voltage but I'm still not clear on what it is exactly. Can someone knowledgeable with tube amps help me understand this? Thanks!
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@daveyf @falconquest This statement is false. If you look at the tube's specs you'll see that for class A operation (single tube) 400V is recommended. This would be the most current you would want to run on the tube for nominal lifespan. When running 500V you would run less current and even less if running at 600V. IOW the class of operation is playing a role. If in class A when the tube is always conducting you don't want to run as much plate voltage if you want the tube to be reliable. Contact Black Ice for the recommended bias point when installing this tube in their amp. |
Thanks Atmasphere! this is from an email directly from Jerred at Black Ice... Here’s a list of the tubes you can use with F22.
EL34, 6CA7, KT77 (Bias is 40mA)
6550, KT88, KT90, KT100, KT120, KT150, KT170 (Bias is 50mA)
So this tells me that the amp transformers should be compatible with this tube. With a 500v plate voltage will I be realizing the full potential of this tube? (it appears yes) It is a fully balanced differential push/pull style, class A/B amp. Can someone also explain "plate voltage"? Thanks for all the responses!
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@atmasphere If you place a KT150 on a tube tester, it will not get to spec unless 600 volts is available. As a result, there are few tube testers that can actually test this tube. |
- 28 posts total