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PostPosted: 19 Nov 2017, 17:28 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
Generally used as a two channel mixer and amplifier, like this:
Attachment:
6J6Mixer.jpg
Nice for building stereo driven "mono"-blocks.


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PostPosted: 19 Nov 2017, 17:39 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, It can make a small push-pull power amp. If you look at the baby sort of oddwatt headphone amp I posted a while ago...you can do the same thing with the 6J6.

Good listening
Bruce

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PostPosted: 19 Nov 2017, 20:46 
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Location: Australia
I would image these tubes are quite cheap and there may be thousands of them around. The ones I have are GE NOS. Couldn't think of a better example of the tube. I've always found GEs to be excellent sounding.

The schematic of the HP amp I have should shows the input goes into the phase splitter with no input or preamp stage. Maybe this was done due the fact that the cathode is shared.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 20 Nov 2017, 00:41 
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Location: Chilliwack, BC
6J6 in my neck of the woods are considered "plinker" tubes. You can literally get buckets for free from those who have them.

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PostPosted: 21 Nov 2017, 05:41 
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I've had further discussions with Oatley today and they claim that a SMPS is the way to go here. Theory is that it will not induce magnet issues into the OPTs as the current power tranni is.

We all know that with switching around the 400KHz range radiation of others sorts can occur. Of course we can't hear it but all worry about what else it is getting into.

I do have hum in mine thougn I have split the PS from the main board and moved it off to one side. I am told by Oatley that it is the use of OPTs which is causing the problem. I'm told if you pullout all the tubes you will stil get some hum. The secondary of the OPTs is floating so it must be magnetic induction into the OPTs.

The other alternative is a small toriodal tranni. Still a possibility. Or I find some tin cans and sit them over the OPTs and earth them. The frame of the OPTs is earthed which did help.

Stay tuned.

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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 21 Nov 2017, 06:51 
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The board with the opt - try turning it so the corner of the tranformer is facing the source of the magnetic field.

Attached is a 12BY7 I did with same hum pickup issues. Notice the transformer orientation to solve the problem.

Cheers!


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* Ratings are for transistors - tubes have guidelines*
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PostPosted: 21 Nov 2017, 15:32 
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Geek, thanks. I'm still thinking tin cans.

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PostPosted: 25 Nov 2017, 20:23 
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Some final images of the HP amp. I have managed to get the faint hum under control and have enjoyed a long afternoon on the receiving end of this amp. There maybe a SMPS coming out for the kit or a toroidal tranni.
Attachment:
PB263657 (800x565).jpg
Attachment:
PB263658 (800x582).jpg


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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 28 Mar 2018, 18:15 
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Here is a second protype of the 6J6A based headphone amp from Oatley Electronics Australia, with OPTs. This time with toriod power tranni. I'll breadboard this one also. Haven't heard it yet. The toriod replaces the EI tranni because the EI tranni was inducing hum into the OPTs.
Attachment:
image.jpeg


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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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PostPosted: 30 Mar 2018, 01:35 
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Once more the I put this one on the chopping block. Too pretty to hide. Having a listen now. Early days but delightful.
Attachment:
image.jpeg


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Projects: "Lagoon" - tube preamp with cathode follower | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "retro-Hiraga" - Jean Hiraga Le Monster
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