Just wondering if anyone has given the Zen lightenment a try. Just the fact that I din't need those massive power resistors is making it look good to me. Have not seen any post on this!
Ward
Ward
I saw 300 watt Sylvania bulds for $4 at Lowes last night. They looked exactly like the ones on amp pictured on the Pass site.
Zen-lite
The Zen-lite sounds wonderful, and the glow from the lamps is charming. I'm going to build a second pair, and run them balanced as Nelson suggests.
The Zen-lite sounds wonderful, and the glow from the lamps is charming. I'm going to build a second pair, and run them balanced as Nelson suggests.
zenlite input impedance
Can the input buffer from the Zen 4 schematics be grafted onto the Zenlite to increase the input impedance? I want to construct a balanced version.
John
Can the input buffer from the Zen 4 schematics be grafted onto the Zenlite to increase the input impedance? I want to construct a balanced version.
John
Re: zenlite input impedance
Yes , I do it today single ended with a IRF9610 loaded with 1.5k .
The rail is 45 volts.
I use 80k of feedback(or so) and 10k for input resistor.
It works very well(and sounds too).
Stefano
carpenter said:
Yes , I do it today single ended with a IRF9610 loaded with 1.5k .
The rail is 45 volts.
I use 80k of feedback(or so) and 10k for input resistor.
It works very well(and sounds too).
Stefano
thanks Till,
I've read and enjoyed your post several times prior to writing mine. Do you have any suggestions with setting the amp up in balanced mode? I know I can remove the caps to the speakers in balanced mode.
How does the 9610 sound in the front end? Do you have any idea where it rolls off?
Many thanks,
John
I've read and enjoyed your post several times prior to writing mine. Do you have any suggestions with setting the amp up in balanced mode? I know I can remove the caps to the speakers in balanced mode.
How does the 9610 sound in the front end? Do you have any idea where it rolls off?
Many thanks,
John
Not yet 
I am spending all the money in circuit building and those digital cameras are pretty expensive.
😎
I am spending all the money in circuit building and those digital cameras are pretty expensive.😎
BTW I use 3 Philips homelighting halogen bullbs. 2 bulbs are 500w and 1 150w.All bulbs are 220volt.
The amplifier rail is 45 volts the current is 1.7A and is pretty good.
An inductor of 3mH and a 22000uF cap after it removes well the ac ripple.
The amplifier rail is 45 volts the current is 1.7A and is pretty good.
An inductor of 3mH and a 22000uF cap after it removes well the ac ripple.
projector lamp bulbs
Hey guys,
I saw some 500, 750 and 1000 watt 120 volt projector bulbs online last night. Nebraska Surplus also has some 1000 watt bulbs going for $20.00 US each. Some bulbs have a 4 pin base and a glass profile that resembles an audio tube type bulb. This could really be a fun project. I've constructed the Ax and it sounds just wonderful, but I want to try some other NP designs. Plus, the open layout of the Zenlite resembles the old tube amplifiers. I like retro.
John
Hey guys,
I saw some 500, 750 and 1000 watt 120 volt projector bulbs online last night. Nebraska Surplus also has some 1000 watt bulbs going for $20.00 US each. Some bulbs have a 4 pin base and a glass profile that resembles an audio tube type bulb. This could really be a fun project. I've constructed the Ax and it sounds just wonderful, but I want to try some other NP designs. Plus, the open layout of the Zenlite resembles the old tube amplifiers. I like retro.
John
John,
i´m very happy there is some interest in this simple circuits again. Hopefully the end of chipamp mania? I did not experiment with balanced mode, i build a simple SE stereo amp mainly because i wanted to make something usefull with those 2 1kW bulbs. I did no measurement and only some hours function test with music until now. I did not build a power supply until now, i recived the transformer for this last week. I will have a short trip to mexico next month and hope to find some 110V lightbulbs like Nelson specifies and some stand sockets for them overe there. If so i will take a handfull to germany and build some more Zen lite variations with them. I´m not skilled in circuit design so i hope for some development on the input buffered Zen lite in this thread!
Nice to see interest in this thread......
I hear this is a quality sounding amplifier. The fact that Nelson keeps a pair of heavy duty balanced monoblocks in his stash is quite revealing. Now, I want to experience this amplifier first hand. I'm triamping and the Ax can be switched around to run the midbass and perhaps the Zenlite can run the topend. My horns are 110 db 1w1m. The Ax is warm and clear, but, has just a littly bit of a bite. I'm wondering if the Zenlite will be a bit softer on the top? I plan to construct the bls (bosoz) as I hear it sounds liquid and so very sweet. It's that "liquid" quality that I'm striving for.
Stefano, do you have the ability to draw your schematic in balanced form? When I create a mirror image, I'm not certain what to do with R-7.
I have two 1000VA Plitron trannies w/50-0-50 volt outputs. I'm wondering how to best use these. Any ideas?
Let's have some fun,
John
I hear this is a quality sounding amplifier. The fact that Nelson keeps a pair of heavy duty balanced monoblocks in his stash is quite revealing. Now, I want to experience this amplifier first hand. I'm triamping and the Ax can be switched around to run the midbass and perhaps the Zenlite can run the topend. My horns are 110 db 1w1m. The Ax is warm and clear, but, has just a littly bit of a bite. I'm wondering if the Zenlite will be a bit softer on the top? I plan to construct the bls (bosoz) as I hear it sounds liquid and so very sweet. It's that "liquid" quality that I'm striving for.
Stefano, do you have the ability to draw your schematic in balanced form? When I create a mirror image, I'm not certain what to do with R-7.
I have two 1000VA Plitron trannies w/50-0-50 volt outputs. I'm wondering how to best use these. Any ideas?
Let's have some fun,
John
those transformers should be perfect i think. For balanced i would just use Nelsons circuit http://www.passdiy.com/images/projects/z1-fig15.gif
and add two buffers in the same way as in post #15 or here http://www.diyaudio.com/forums/showthread.php?postid=157720#post157720
at the input
and add two buffers in the same way as in post #15 or here http://www.diyaudio.com/forums/showthread.php?postid=157720#post157720
at the input
what is the difference between a high power resistor and a light buld (except that it produces some light 😉) ?
Is there any difference in the sound?
Last question: why do you make a balanced zen lite, and not simply a soz with light bulbs?
Is there any difference in the sound?
Last question: why do you make a balanced zen lite, and not simply a soz with light bulbs?
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