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Old 6th January 2001, 12:32 PM   #1
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First i must say that my english is poor.
now i have some question?
did enybody bild this amplifier? (Elliott DoZ)
is this a good amplifier?
I need plans for loudspeakers with high efective drivers.
wich diy speakers are good for DoZ.

Thanks. Janey
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Old 8th January 2001, 08:10 AM   #2
FYC is offline FYC  Hong Kong
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Why do you consider the DoZ, not the Zen?

I feel that the DoZ is from the traditional school of thought, with no excitement. But the Zen is different, it represent a liberation from old thinking. And in the end the Zen sound good. I have not heard the DoZ however.
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Old 8th January 2001, 02:27 PM   #3
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Default I agree

I agree with FYC the Zen is a better design a fresh new idea if you will. I to have not heard the DOZ but the Zen amplifier appeals to me much more. As for speaker designs check the forums under Subwoofer project there are afew links there
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Old 10th January 2001, 08:52 AM   #4
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Wink death of zen

i would like to bild zen or SOZ but i need the amplifier
wich could drive a 4 ohm speakers. (JM lab Point Source)
for this speakers 10w is not enought.
The Doz have bouth (4 ohm, 20w)
i build one chanel (DoZ) and sound is prety good only bass
at higher level is not so definite. i think this is hapening
beacouse speaker is not efective. (91.5 dB)
please send me some good speaker project wich are high
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Old 10th January 2001, 01:44 PM   #5
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Wink I have built a DoZ but I would prefer the Zen

I made a cheap DoZ because I had some spare transistors around and i can say it is a cheap project to make.
The sound is very good but not so good that I would prefer it more then the Zen amp. I have made other Zen projects and they sound excelent. I prefer the Zen amp better and it has a unique feature for anyone who needs to drive low ohm speakers :simply make one more amp and paralel input and output to get double current.
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Old 14th February 2001, 07:03 PM   #6
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Thumbs up ZEN

I built my ZEN last year and I admire the work of NP for years.
Well, it made a lot of fun to build an amp for my own, but it was very difficult to find a manufacturer who was able to constuct a housing for it.
My opinion is that the ZEN is by far the most musical amp I've ever heard - and I heard a lot of ampssince I was in business for 25 years and have a full collection of AudioResearch at home.
I never will understand, why NP did never decide to make them factory-built.
By the way...
I do not intend to have my neighbors entertained by listening to music. So far, a loudspeaker with an efficiency of about 90 to 92 dB will do good jobs in a conventional environment. The only thing is they have to be as good as the ZEN and the music-sources.

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Old 14th February 2001, 10:06 PM   #7
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Talking Long Live ZEN and Pass Labs!!

Sorry to add to the overwhelming preference to the Pass Zen amp, but I can't help myself! I built the Zen amp pretty much as the original article stated, because later came the upgrade article. My version sounds great as it stands, with room to improve upon it.

I have read in more than one place the benefits of MOSFETS over bi-polar transistors. When used correctly, MOSFETS allow for simpler circuits. Take the Citation 12 amp for example, there are less amplification stages in the mosfet design than there are for the original bi-polar design.

You have to do what's best for you at this time, though. A majority of the people's on this site seem to believe that simpler sounds better, but no simpler than need be. It may be cheaper to build a DOZ, but is it worth it in the long run?

I should have just gotten to the point. Strongly consider building the Zen amp over DOZ.

In addition, there is a ZEN amp being built commercially by Volkamp. I asked about it several months back. It's going to sell for about $1800 USD. I ordered the ZEN board from Old Colony Sound Labs for $12 and rolled (built) my own for about $175 without Chassis. I bet once people hear it, they would still pay $1800 for it. It's worth it!!

Good Luck!


[Edited by vdi_nenna on 02-14-2001 at 05:24 PM]
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Old 16th June 2001, 08:11 PM   #8
paulb is offline paulb  Canada
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I'm considering building the DoZ and have acquired the PCBs from Rod. I noticed that, of these posts, only two have actually built the amp, and only one has compared it to the Zen ("sound is very good but not so good that I would prefer it more then the Zen amp"). The others just talk about the "excitement" of the Zen design, or words to that effect. I think there is serious subjectivism tied in with the Zen among DIYers (although that's part of the fun).

Has anyone found anything seriously wrong with the DoZ?

Please don't reply that it's "not as good as X" unless you've actually compared them or have found a flaw in the circuit somewhere. It's not an old design; Rod started with the Zen concept (a single transistor) and refined it, according to his criteria, to a topology that looks remarkably like the JLH Class A amp of 20-odd years ago. So it's a new design that kind of confirms Hood's design, which is still very popular among DIYers. I chose DoZ mainly because the PCBs were available and much cheaper than the JLH ones. I chose a Class A design because of the fun of telling people who know a little bit about amplifier design that I'm building a Class A amplifier, and because I happen to have a transformer that suits the amp.
My eventual plan is to biamp my system, with the Class A driving the midrange & tweeters, and a Class AB driving the woofers.
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Old 16th June 2001, 08:55 PM   #9
Asen is offline Asen  Bulgaria
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Default DoZ, JLH, Andreas Follower

I had the same problem like you with the heavy load of my speakers. I wanted to build the Zen amp, but Nelson's report about it's behaviour with heavy loads made me draw back of this idea. So I went for the Linsley Hood's old SE amp. It is something quite similar to the DoZ. I chose the JLH because it is an old, tested amp. When the DoZ appeared for the first time in the Net it was only a simulation. No listening tests had been made.
If you want 20W in 3-4 Ohms loads, why don't you take a look at the Andrea's Follower 99. It's a SE MOSFET design, no NFB. I don't expect to perform worse then the Zen. Andrea himself says that heavy loads are not a problem. In this case you should think about a good preamp too.

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Old 26th February 2002, 06:28 AM   #10
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I've only just discovered this site and this is an old thread so I doubt if anyone's reading this, you're all off listening to your Zens and having a good time. I built a DoZ a couple of months ago. No attention to parts, matching, or proper heatsinking (I had to add Rods Fans). The entire thing was made from surplus stuff for probably less than $100. And it sounds great, even though it does look like some kind of motor control system. Since then I've bought two sets of boards from Rod. I've just finished a DoZ Headphone amp with everything matched and it is staggering! Based on these experiences I'll be starting on a final (houseworthy) DoZ shortly. I've got everything I need except the @#$% heatsinks. (If anyone can offer some tips on where to get big enough, pretty enough and cheap enough heatsinks I'd be most grateful). I can't comment on a Zen or variant thereof as I've never heard one, but I will say that as far as I'm concerned, Rod Elliott's the man!!
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