What do you guys think of the 5670 as a gain tube in a preamp stage application. This will be coupled to a 6n6/5687/etc hefty tube to do the lifting. Looking for a medium mu dual triode. Discounted the 12AU7, 12SN7.
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?
I have used them in LTP. They work good. Odd pinout though. I have seen schematics using them in amplifiers and preamps but I don't have anything in memory right now. Search here or Google using all of the possible numbers.
5670 = 2C51 = WE396A
Hello,
The 5670 is a nice little tube. I have assembled several breadboard circuits with it. Take a look at the curves; they look well behaved; straight and evenly spaced. There are many of them around for not much money. They were built to be used in a M1 tank.
DT
All just for Fun!
The 5670 is a nice little tube. I have assembled several breadboard circuits with it. Take a look at the curves; they look well behaved; straight and evenly spaced. There are many of them around for not much money. They were built to be used in a M1 tank.
DT
All just for Fun!
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.
I Like very much the ECC804 as dual triode medium mu ! Have done some things with them and are very good ! Dont know if someone tested this ones but are very linear and i like the sound !
I have a stash of NOS Bendix 6385 which is also similar I believe, except from a bit higher filament current.
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?
Hi,
I use it as a tube buffer(Cathode Follower) to replace 6N3(it not really a direct replacement) no problem sounds quite good.
I use it as a tube buffer(Cathode Follower) to replace 6N3(it not really a direct replacement) no problem sounds quite good.
I have been using them in a lieu of 6N3P as well. Does anybody know the difference between the 6N3P and 5670?
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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