5670 Thoughts?

eeyore · 8th November 2010, 05:20 AM

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.

Miles Prower · 8th November 2010, 09:25 AM

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?

tubelab.com · 8th November 2010, 01:04 PM

Quote:

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

DualTriode · 8th November 2010, 02:27 PM

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!

Svein_B · 8th November 2010, 02:30 PM

The Russian and Chinese 6N3 are also equvalent. Used in many amps and CD plyaers sold on Ebay.

kevinkr · 8th November 2010, 05:31 PM

Quote:

Originally Posted by DualTriode

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!

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?)

acmarsden · 8th November 2010, 05:52 PM

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.

Jaap · 8th November 2010, 06:58 PM

Here you have one: Reference preamp Othello !
2C51 = 5670 as you probably know

el156 · 8th November 2010, 07:20 PM

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 !

Wavebourn · 07:55 PM

Quote:

Originally Posted by Svein_B

The Russian and Chinese 6N3 are also equvalent. Used in many amps and CD plyaers sold on Ebay.

Do you mean 5670 is similar garbage?

8th November 2010, 05:20 AM	#1
eeyore diyAudio Member Join Date: Aug 2005	5670 Thoughts? 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. __________________ DF http://diy-audio-blog.blogspot.com

8th November 2010, 09:25 AM	#2
Miles Prower diyAudio Member Join Date: May 2005 Location: USA Blog Entries: 2	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? __________________ There are no foxes in atheistholes www.dolphin-hsl.com

8th November 2010, 05:52 PM	#7
acmarsden diyAudio Member Join Date: Jan 2009	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.

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8th November 2010, 02:27 PM	#4
DualTriode diyAudio Member Join Date: Aug 2009 Location: Sacramento	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!

8th November 2010, 02:30 PM	#5
Svein_B diyAudio Member Join Date: Oct 2005	The Russian and Chinese 6N3 are also equvalent. Used in many amps and CD plyaers sold on Ebay.

8th November 2010, 06:58 PM	#8
Jaap diyAudio Member Join Date: Dec 2002 Location: Netherlands	Here you have one: Reference preamp Othello ! 2C51 = 5670 as you probably know

8th November 2010, 07:20 PM	#9
el156 diyAudio Member Join Date: Apr 2010 Location: ALBUFEIRA ;PORTUGAL	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 !

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