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Portable Tube amp by Oatley: K272 - Page 2

post #16 of 30
3/15/10 at 5:27pm
Quote:
Originally Posted by netsky3 View Post
I've bought this amp few days ago. Anyone use the amp with a power supply?
I have here one at 12V and 1000mah, is too much?
A 12 volt supply is no problem. I've read people going to 18 volts. Note: 30 volts is the maximum plate voltage of these tubes. The L4949 can handle max. 28 volts. I have one too, still unboxed, getting its juice from a adjustable PSU currently @ 15 volts.
A 1000mA supply shouldn't even break a sweat.
There's a lot of info here: Vacuum Tubes / Valves • DIY Audio Projects Forum You can find pics of mine too.
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post #17 of 30
3/15/10 at 9:36pm
Quote:
Originally Posted by Beftus View Post
A 12 volt supply is no problem. I've read people going to 18 volts. Note: 30 volts is the maximum plate voltage of these tubes. The L4949 can handle max. 28 volts. I have one too, still unboxed, getting its juice from a adjustable PSU currently @ 15 volts.
A 1000mA supply shouldn't even break a sweat.
There's a lot of info here: Vacuum Tubes / Valves • DIY Audio Projects Forum You can find pics of mine too.
many many thanks dude!!
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post #18 of 30
3/20/10 at 4:17pm
I'm a new owner of AKG 240mkII that have 55ohm, is too much for this amp??
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post #19 of 30
3/20/10 at 4:26pm
No problem. I use mine with a pair of 32 ohm Sennheiser PX-100's.
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post #20 of 30
3/20/10 at 5:11pm
Quote:
Originally Posted by Beftus View Post
No problem. I use mine with a pair of 32 ohm Sennheiser PX-100's.
Uhm...I don't think that is the same thing but I hope you're right.
I consider 32ohm a normal impedance
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post #21 of 30
3/20/10 at 8:07pm
Driving low impedance headphones is more difficult than driving high(er) impedance loads for an amp. Output level can suffer though. I've read that you can use the K272 even with higher impedance loads.

First post here: 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) • DIY Audio Projects Forum
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post #22 of 30
3/20/10 at 9:28pm
Quote:
Originally Posted by Beftus View Post
Driving low impedance headphones is more difficult than driving high(er) impedance loads for an amp. Output level can suffer though. I've read that you can use the K272 even with higher impedance loads.

First post here: 6418 Tube / Opamp Headphone Amp (Oatley Electronics K272A) • DIY Audio Projects Forum
Good
Thanks!
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post #23 of 30
3/29/10 at 2:47pm
I need a little help, can anyone tell me the dimension of the board?
Many thanks
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post #24 of 30
3/29/10 at 3:31pm
Which version of the board? The newer version has two AA size batteries in a clip mounted on the PCB and needs a 9 volt battery. I have the old version that runs on a single 9 volt battery. The old version measures 44 x 104.5mm.
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post #25 of 30
3/29/10 at 4:30pm
Quote:
Originally Posted by Beftus View Post
Which version of the board? The newer version has two AA size batteries in a clip mounted on the PCB and needs a 9 volt battery. I have the old version that runs on a single 9 volt battery. The old version measures 44 x 104.5mm.
I should receive the newer version, with the clip on the pcb. Same dimension i think.
Thanks anyway
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post #26 of 30
4/6/10 at 8:49pm
i have a new one at home waiting. i can measure it tonite for you.
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post #27 of 30
4/7/10 at 7:57am
Quote:
Originally Posted by studeb View Post
i have a new one at home waiting. i can measure it tonite for you.
Don't worry, i've received the mine
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post #28 of 30
5/18/10 at 9:46pm

I had just ordered one of this amp. Anyone has the dimensions of the board for the newer version amp? Need to hunt for the case for it.

 

Wondering how long it take to arrive, really looking forward to receive it. Thanks.

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post #29 of 30
5/25/10 at 10:14pm

I read it dimension is 138mm x 66mm. Hope it is helpful for some. Still waiting for mine to arrive. 

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post #30 of 30
9/20/10 at 7:13pm

Completed this amp a while ago. Below is the picture of it. Cheers!

 

K272A-6418-Amp18.jpg

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