No direct experience with this one, but it looks like you ought to be able to find a decent loadline if you have the Vpp margin to get the plate current above 5.0mA or so. Looks like a good choice if you need something that falls between a 12AU7 and a 12AT7 for gain.
Maybe someone has actually tried them?
Maybe someone has actually tried them?
It's pretty popular in this neck of the woods for line and phono stages, reputedly a good sounding tube. I have a number here and a line stage that uses them that I never finished..
(Someday?)5670 Tube
The 5670 triode is used in S5 electronics K-16LS amp kits, among others, as a phase splitter, and in their add-on 'preamp' and tone circuits. I have built a few of these kits and never had a reliability issue with the 5670 or for that matter the 6005 pentodes used in the power amp section. Cost for a 5670 is $6.00.
The 5670 triode is used in S5 electronics K-16LS amp kits, among others, as a phase splitter, and in their add-on 'preamp' and tone circuits. I have built a few of these kits and never had a reliability issue with the 5670 or for that matter the 6005 pentodes used in the power amp section. Cost for a 5670 is $6.00.
Yup, evenly spaced curves make a linear tube. That shared cathode is something to consider when designing, perhaps doubling up triodes for half Ri.
How does that work with a higher current heater? Is the cathode made thicker to have the same emission as the lower current heater or did they do a re-design with alternate electrode distances?
How does that work with a higher current heater? Is the cathode made thicker to have the same emission as the lower current heater or did they do a re-design with alternate electrode distances?
NOS 6386's are worth their weight in gold! The 6386 is a variable Mu version of the 5670. It was designed for AGC control in RF or IF amplifiers. It was used as the control element in virtually audio compressor made during the vacuum tube era. The Fairchild 660 and 670 are still being used, and the tubes are getting scarce.
I got them in my Two Dared MP5 Hybrids - in preamp section ... Not bad ...
Got some NOS 5670, maybe will keep them and find some decent preamp to build ...
HEINTZ and KAUFMAN 5670 NOS in the box
I know they are in some DAC tube stages too ...
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Got some NOS 5670, maybe will keep them and find some decent preamp to build ...
HEINTZ and KAUFMAN 5670 NOS in the box
I know they are in some DAC tube stages too ...
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