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PostPosted: 14 Mar 2017, 23:44 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Oatley have been known for their portable triode HP amps but this time a base station style. Using two 6J6s per channel - the first phase splitter then one for the PP power drive. The brd. is in prototype and was sent to me assembled with minor mods underneath. I have already suggesting putting the tube sockets on the back of the board so the tubes can be exposed. Or offer two modelscct. brds. one for hidden tubes one for exposed.

The kit is complete as in the image. All trannies etc. The PS section can be snapped away if required. There was a little hum. I have already spoken to Oatley about this a suggested a few tries to quieten even more though it is already very quiet.

On a quick listen the amp really performed on my 250ohm Beyerdynamic 700s but sounded a little strained with Beyer 32ohm phones. The amp was very impressive lots of drive.

Tubes are NOS NIB GE 6J6. I nice tube for any project.
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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 18 Mar 2017, 14:21 
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Location: Arizona, USA
Hi Mark, Cute little dude. It needs bigger iron and to match the phones better more than one output impedance. I ran into the same problem initially with the phone amp I posted using the 6DJ8s.

Good listening
Bruce

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PostPosted: 18 Mar 2017, 18:00 
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Bruce, it does have dual secondaries on the OPT which offer low and high impedance outputs. I can see it on the schematic but didn't try to work in our on the brd.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 21 Mar 2017, 20:57 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Nice to see a new Oatley kit offering in the works.

I like that the PCB can be split to move the power supply away from the amp. Another reason to put the tube on the opposite side of the board is because those nearby capacitors will be expose to a lot of heat from the close tubes and probably won't last too long.

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