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In Reply to: Musings on passive vs active preamp with tube buffer stage posted by tketcham on February 21, 2021 at 08:08:36:
I hope you understand that the iFi iTube2 buffer is just an Opamp based device with one 5670 tube thrown in so they can call it a "tube" buffer. The "modes" you speak of are just emulated, not physically realized.
The device operates from 15vdc.
A 5670 tube can not be operated in a linear, low distortion fashion at such a low voltage. Triode tubes, when operated properly, exhibit very little upper ordered harmonic distortion and that is why I use them. But to do so the 5670 would have to be operated with something like 150vdc on the plate and about 8ma of plate current flowing at idle. An operating point that is not achievable in the iFi iTube2 buffer.
but if it sounds good to you I guess that's all the matters.
My advice, if you want to hear what real tube circuits sound like, get some real tube gear.
Sorry for the rant. Don't take it personally. It's just that solid state gear with a tube thrown in so they can market it as a "tube unit" is one of my pet peeves.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Follow Ups
- RE: Musings on passive vs active preamp with tube buffer stage - Tre' 09:55:24 02/21/21 (5)
- RE: Interesting - tketcham 16:53:20 02/21/21 (2)
- RE: Interesting - Cut-Throat 07:12:03 02/22/21 (1)
- RE: Interesting - tketcham 10:07:05 02/22/21 (0)
- I experienced the same - E-Stat 16:28:46 02/21/21 (1)
- Yup. nt - Tre' 16:20:05 02/27/21 (0)
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