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Old 2nd April 2003, 06:32 AM   #1
digi01 is offline digi01  China
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Default MY Morgan Jones headamp.

This reverse-engineered version of the famous EarMax headphone amplifier has just 3 tubes, The primitive edition was not global feedback, I consulted Mr cmoy's The Morgan Jones Mini Tube Headphone Amplifier work join feedback circuit. and is powered from wall-wart.I have made one, used for driving my HD495 headphone.
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Old 2nd April 2003, 06:42 AM   #2
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PIC 2 ,the tubes is three 6DJ8.
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Old 2nd April 2003, 05:54 PM   #3
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Nice amp Digi01, how does it sound?

BTW what's the impedance on your HD495?
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Old 2nd April 2003, 11:32 PM   #4
digi01 is offline digi01  China
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Sound fine and smooth soft and graceful, can very good drive low impedance 495 headphone(32ohm) of me. Orchestral music stage very broad, sound of violin have feels while being very much ture. It is playback newage of Enigma,etc. music bass enough lively insufficient.

haibo
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Old 3rd April 2003, 12:12 AM   #5
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Hmmm.... All the way from Peking, welcome to DIYaudio!!!

I hope there are many other projects coming in the future, you will find here a lot of guys ready to help you out. Keep in contact.

Thanks for your replay and happy listening!!!
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Old 9th April 2003, 06:53 AM   #6
digi01 is offline digi01  China
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Help the friend to make one again recently.
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Old 9th April 2003, 07:06 AM   #7
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bottom:
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Old 24th April 2003, 08:47 AM   #8
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NEW inside
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Old 24th April 2003, 01:37 PM   #9
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Hi digi01;

Nice workmanship on the amps, particularly the layouts and the metalwork for the mountings!! Good show!!

Hmmm, I may have to try that style of layout should I ever need a "child friendly" amp for the house. Did you have to do anything special (fans underneath, extra venting, etc) to keep overheating from being a problem due to the closed up location of the valves?

By the way, what brand are those resistors? They look like 1 watt metal films, but they do not look like the Philips ECG's that I stocked up on years ago.

All the best,
Morse
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Old 25th April 2003, 01:19 AM   #10
digi01 is offline digi01  China
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Morse
I like MJ that you made very much too, the appearance is very simple and unsophisticated.
The question dispelling the heat is relatively difficult to manage, I have opened some holes, utilize convection to dispel the heat in roof and side of chocolate box. Consider that the "child friendly" morly,all components are hidden in the box .
Those resistors is made in BeiJing China,military industry products,1 watt metal films of high accuracy. The friend gave to me.
I use varnished cloth bakelite board that spend, component weld hole nailed and fixes with the copper gold-plating.


cheers
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