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24.23.216.188
How do amplifiers accommodate different tubes with different power ratings?
For instance, going from an EL34 to a KT150 as in this writeup:
Follow Ups:
I would echo what has been said - the delta between an EL-34 and a KT150 is Significant-
Filament amperage: KT150 is noted at 2.0amps maximum and 1.75amps minimum. An EL34 is 1.5A - one will be underpowered, or have a shortened life...
Typically an EL-34 is run w/ ~400-450 volts at ~120mA on the anode/plate - the KT-150 is more like 800+V at 150-180mA
6550/KT-88 into the KT 120/150... are more compatible in a given amp
THe EL-34 was designed as a lower output tube - for a slightly different application...
I will also readily admit that the KT 90, 120, 150 are not my cup of tea.
esp the KT-90....
Happy Listening
A amplifier optimized for one of those tubes will not/can not be optimized for the other.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I do not think any amp exists that can have either EL34 or KT-150 as an option, but some do accommodate same family of tubes. Some have different bias settings for the different tubes.
They exist. PM amps have a hi/lo bias switch. They can take just about any output tube that will fit in the socket. Is that optimal? probably not. Note: The difference in output power between EL-34s and KT-150s in PM amps is minimal. There are manual biasing amps that will take that wide range of tubes. Again, optimal? Don't know.
Jack
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