Author Topic: zenelectro amp  (Read 2979 times)

Offline kajak12

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zenelectro amp
« on: December 28, 2011, 12:03:04 PM »
zen amp

1 x zen amp channel fired up last night on bench.

Worked perfectly 1st go, biased up perfectly.  
150W 8 ohms / 240W 4 ohm - plenty of power for my little ML1's.

FR was past 1MHz - 100kHz square wave, no probs - had put some HF limiting in,
don't need to listen to radio stations.  

No coupling caps required anywhere - OP drift is low.

Hopefully tonight 1st listening test.

Bring it on!

Z
« Last Edit: December 28, 2011, 12:08:27 PM by kajak12 »
still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline Drizt:)

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Re: zenelectro amp
« Reply #1 on: December 29, 2011, 06:04:16 PM »
Is this a commercial product or a once off ?

Offline zenelectro

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Re: zenelectro amp
« Reply #2 on: December 30, 2011, 12:26:32 AM »
Is this a commercial product or a once off ?

The one in the pic is a proto to drive my ML1's.

If it sounds really good, I may make some more and sell them. The design has some pretty good features like no caps in sig path
/ no DC servos. Which is a bonus cost wise, 4 x Duelunds / amp =  :o

It also can be built for a decent price given it's a pretty powerful amp (300W / 4).

Having said that there are some pretty decent Chinese offerings around for stupid cheap money ATM = tough market place.

Should be running very soon.

   

Offline Drizt:)

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Re: zenelectro amp
« Reply #3 on: December 30, 2011, 12:37:39 AM »
Thanks for the reply Zen.

Good luck with your amps.

Offline zenelectro

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Re: zenelectro amp
« Reply #4 on: December 30, 2011, 02:02:18 PM »
Thanks for the reply Zen.

Good luck with your amps.

Thanks Drizt.

Finished bench testing both channels this morning 5.00am.  :'(  Tonight will start listening / tuning.  ;D

Looks like it should be a very good amp for driving ESL's (electrostatic speakers) which are very difficult capacitive load and require good power OP.
Last night I was driving 50kHz square wave with a 2.2uF cap shorted directly across amps OP. No probs whatsoever and not much ringing.

Bring it on!!!

« Last Edit: December 30, 2011, 02:06:29 PM by zenelectro »

Offline ozmillsy

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Re: zenelectro amp
« Reply #5 on: January 04, 2012, 05:46:41 PM »
Cant make out too much from the small pic,   but it looks to be an elegantly simple design.    Nice work.   
It's all about the music,, not the equipment.

Offline kajak12

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Re: zenelectro amp
« Reply #6 on: January 04, 2012, 08:45:56 PM »
is it firing on all channels yet zen?????/ ;)
still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline zenelectro

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Re: zenelectro amp
« Reply #7 on: January 05, 2012, 02:31:23 PM »
is it firing on all channels yet zen?????/ ;)

Bench tested, assembled and 99% wired up.
Soft start installed, main filter caps very large and could possible blow up the (200A surge) rectifier diodes.
Additional choke filtering also added.

Just have to connect input wires. :)

Oz, we were discussing time management, how many hours you reckon are in this?

Offline vitavoxdude

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Re: zenelectro amp
« Reply #8 on: January 05, 2012, 03:04:04 PM »
I would estimate around 3 days work to assemble if you ignore tea and meal breaks but the first one always takes considerably longer due to working out layouts / mountings etc.  Building them in minimum batches of 10 you may reduce timings somewhat.
V ;)
We all like different things so lets all agree to disagree and if any common ground is found then worship it.  Mine is the KD hence being present on this forum.

Offline ozmillsy

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Re: zenelectro amp
« Reply #9 on: January 05, 2012, 09:53:50 PM »
Oz, we were discussing time management, how many hours you reckon are in this?
Hehe, :) .  Well, I'm no electronics engineer, but I have a sneaking suspicion that you've spent more time developing the design, than you have doing the build.

How many hours invested? A log book would be useful. ;)

Can't wait to hear it !

A question everyone will have is, can it deliver the holographic flesh and bone, that the best tube amps deliver?   
It's all about the music,, not the equipment.