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Old 24th September 2010, 07:12 PM   #11
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I've already agreed that the schematic in the first post is not good for what I'm looking to do. I was now focusing on the second schematic in post #4. Since this is a headphone amp, I would think it would have to be halfway decent to listen to. I'm just thinking of coupling that to some sort of small chip amp for a compact stereo amp that has a nice tube sounding front end to it. This approach also has the added benefit of being able to use it with a pair of headphones and bypassing the power amp section altogether.

Glenn
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Old 24th September 2010, 07:35 PM   #12
DF96 is online now DF96  England
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But it still has far too low a supply voltage, so the only "tube sound" you will get is distortion. If you want to use a valve then you need 30-40V minimum; even then you will get some distortion. Valves don't magically wipe away "SS sound" - like any other component they either add/subtract very little (when used correctly) or add their own distortions (when used badly).
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Old 24th September 2010, 07:49 PM   #13
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by DF96 View Post
But it still has far too low a supply voltage, so the only "tube sound" you will get is distortion. If you want to use a valve then you need 30-40V minimum; even then you will get some distortion. Valves don't magically wipe away "SS sound" - like any other component they either add/subtract very little (when used correctly) or add their own distortions (when used badly).
I know I thought the same thing so I built it! How can a tube run on such a low voltage. However in the link the guy refers to the tube being used in low voltage applications in the battery circuits in the military! Not with an inverter!

So I built the circuit out of curiosity and I have to say it sounds quite good even when amplified at party levels! OK it's not hifi, however it gives mini systems a run for their money! You can hear people breath as they sing and the wood on acoustic guitar!

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M. Gregg

Last edited by M Gregg; 24th September 2010 at 07:57 PM.
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Old 24th September 2010, 08:01 PM   #14
M Gregg is offline M Gregg  United Kingdom
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The sound reminds me of an old HMV record player with better high frequency response!

I thought about ECC83 ECC81 etc however this seems only true for the 82. I have an old RCA 82 playing kate bush as I type this!

Last edited by M Gregg; 24th September 2010 at 08:17 PM.
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Old 24th September 2010, 08:16 PM   #15
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Thanks for the review, probably worth building since it's a pretty simple circuit.
I'll post pictures when I complete the prototype. Thanks for all the input everyone!

EDIT:
Here's the full explanation of the circuit http://diyaudioprojects.com/Solid/12...LM317-Headamp/
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Old 24th September 2010, 08:20 PM   #16
M Gregg is offline M Gregg  United Kingdom
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You must treat it as a hifi project all the same things apply. Built mine on tag board and mounted the tube socket on it!

All the Best!

Last edited by M Gregg; 24th September 2010 at 08:27 PM.
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Old 24th September 2010, 09:01 PM   #17
M Gregg is offline M Gregg  United Kingdom
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It was done as a fun project!

Just for fun I built mine in a cigar box!
LOL couple of hours after work!



DF96 I have now put an LED under the tube, because it annoys people!
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Last edited by M Gregg; 24th September 2010 at 09:30 PM.
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Old 25th September 2010, 12:22 AM   #18
Bigun is offline Bigun  Canada
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Looks very nice - some photos of the inside ?
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Old 25th September 2010, 04:28 AM   #19
soro is offline soro  Taiwan
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How about this one?
I made it.
B+ 12V bettery supply.
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Old 25th September 2010, 07:42 AM   #20
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Default Ready-made for T-amp

There is a $20 pre-build buffer board with 12AU7 intended for Tripath amps so it may work with LM as well. I have one with TA2020 and it does make a difference ('rounding' the sound). It's fed off 12V but the tube gets 43V (3ma) which is a more realistic level. You can see it at
Special for Tripath! 12AU7 Buffer Amp for smooth sound - eBay (item 260658637265 end time Sep-30-10 20:25:26 PDT)
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