kevin gilmore

Megatron Electrostatic Headphone Amplifier

713 posts in this topic

28 minutes ago, chinsettawong said:

 

28 minutes ago, chinsettawong said:

Your amp looks really nice.  Please show us the underside as well. :)

About the volume, it might have something to do with your source putting out too soft sound too.  Please check.

Thank you chinsettawong.

The source is a Yamaha SACD player (CD-S2100) so it's a balanced 2v output.

Here's the underside with board not yet fully mounted and transformers not yet hooked up:

tn_IMG_0819_zps8yfm1svr.jpg

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Congratulations on a very nice build!

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Very nice build Leve. The VCaps will really let the sound bloom after some time.

I hope to start the case preparation for my build this week end. The boards need just one or two more bits  I begin testing.

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Leve does your pot have a 100K resistor load on it? I replaced my pot resistor on my Passive pre-amplifier for a 10K load, which redialed the gain to the pot. 

Edited by astrostar59

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3 hours ago, astrostar59 said:

Leve does your pot have a 100K resistor load on it? I replaced my pot resistor on my Passive pre-amplifier for a 10K load, which redialed the gain to the pot. 

No. The input goes directly to the pot and from the pot directly to the board. At full volume I measure about 0.5 ohms between input and output. The pot is Khozmo's new relay based design.

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I finally finished this one today after about... 4 years or so...  Let's just say that I hate anything with umbilical cables...  ;) 

20170204_133238869_iOS.thumb.jpg.e55d29144bbb248e3a0ea1721bba7c7f.jpg

Besides the madness of using 4 mains transformers and the super short filament winding's for the CCS tubes this was easy enough.  Running at +/-400V off a BHSE power supply with the dropper resistor and zeners to feed the front end.  Only main difference is the 12VDC supply used to heat the front end tubes so the board was cut up pretty bad.  Next one will use the Megatron V2 pcb's in about 3 years or so...  :D

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how do you like it against the other amplifiers in your stable?

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It's excellent, nothing short of that for an all tube design.  Gives the BHSE a run for its money...

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Great job, spritzer and congratulations!  Perfect for those cold Icelandic summers.  :D

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Can you do one in solid state....?      :o

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I might do a version of this circuit with SS CCS just to make it a lot less complicated.  :)

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