Hopefully a simple question.

[Kay Pirinha]

Originally Posted by DF96

Others were specially designed, but as the aim was switching they didn't worry too much about linearity.

Please have a look at the E 90 CC and the E 92 CC curves. In my eyes these computer valves (designed for Windows 58...) don't seem to be too un-linear, do they?

Btw: They are cheap, too, especially if you consider the RFT counterparts ECC 960 and ECC 962, respectively.

Best regards!

[DF96]

Almost any triode will not be "too un-linear", but some are more linear than others.

[Adolf Corkscrew]

Well, if you had a CCS at the anode, and ran them at about 5mA and 300V B+, the result might actually be quite acceptable. Then again, the same operating conditions with a truly linear triode like the ECC99 from JJ Electronics results in very low distortion.

One thing often mentioned in the datasheets of these computer triodes is that they're prone to microphony. That's a thing to take into consideration when designing audio equipment.

[20to20]

Originally Posted by Adolf Corkscrew

Well, if you had a CCS at the anode, and ran them at about 5mA and 300V B+, the result might actually be quite acceptable. Then again, the same operating conditions with a truly linear triode like the ECC99 from JJ Electronics results in very low distortion.

One thing often mentioned in the datasheets of these computer triodes is that they're prone to microphony. That's a thing to take into consideration when designing audio equipment.

Find the RCA 6201 (12AT7 type) data sheet. It has very interesting design notes, for use under cutoff, on/off controls, and high vibration environments. Sounds like the perfect tube.