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Old 5th September 2012, 05:18 PM   #11
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Quote:
Originally Posted by DF96 View Post
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.

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Old 5th September 2012, 05:50 PM   #12
DF96 is offline DF96  England
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Almost any triode will not be "too un-linear", but some are more linear than others.
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Old 5th September 2012, 10:48 PM   #13
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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.
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Old 5th September 2012, 11:07 PM   #14
20to20 is offline 20to20  United States
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Quote:
Originally Posted by Adolf Corkscrew View Post
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.
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