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Old 24th May 2004, 05:55 PM   #11
Sherman is offline Sherman  United States
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Quote:
Originally posted by hkoetz


I wired in the pot and it is sensitive enough for my CD player (200 mV).

It is not realy a kit but more a set of parts.

Henk

Yeah, I guess "kit" is a little too generous. I've been thinking of building a pair of these (or putting 2 in a single chassis) as an amp for my office. It looks as if it could be built very small indeed. Just using a pot w/o a preamp might be a better way to go to save space.
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Old 24th May 2004, 08:35 PM   #12
amt is offline amt  United States
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Hkoetz

Thats a nice simple design, with a schematic, parts list and layout.

Do you think that those OPTs are really going down to 30hz? If so, thats a great price.

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Old 24th May 2004, 09:19 PM   #13
G is offline G  United States
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Quote:
Originally posted by Stixx
Chris

Chris,
I had the Zenamp for testing a little while ago, and they definitely sound very good. Resolution and imaging was much better than my Onix monos, they only lack a little oomph in the lower registers.
But even with your 90dB Ariels I'm afraid they will have not enough power, on my 95 dB OB's with vintage Telefunken they couldn't manage to go very loud, unless you are happy with modest listening levels. They also benefit from an even impedance curve of your loudspeakers...

Enjoy,
Oliver
I built a "clone" of this amp using EL84s and a 5687 (big surprise huh?) and I think the higher current (12mA) helped the bottom end a great deal. I did however use output transformers that were oversized for the purpose by a large degree ( Handwound Transformers from EBAY.) despite the bad rep for these output transformers they were more than adequate for the puposes of my circuit at 36mA. Granted I am using a pair of BR Fostex speakers using the outstanding and reasonably priced FE206E Fostex full range drivers that present a very even and benign load to the amplifier and have a efficiency rating of approximately 97dB 1W/1M. The amp does clip if pushed too hard but sounds very punchy and nice at "moderate" listening levels. I would not recommend the circuit if you listen to "Megadeth" on a regular basis but it aquits itself nicely to Jazz. Especially comtemporary artists such as Nora Jones and Diana Krall. I think the higher current of the 5687 helps the bottom end a great deal. I said that already though, didn't I?

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Old 25th May 2004, 01:29 PM   #14
chrish is offline chrish  Australia
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Thanks for the input guys,

Maybe I should have mentioned that I am in the process of building an active crossover, 24db/octave 80hz based on Rod Elliot's pcbs so that a pair of subs can handle the lows. Will basically be following Lynn Olson's suggestion http://www.nutshellhifi.com/ME2txt.html#sw

Will this ease the required power for the main speakers? Thought I had found the ideal project, perhaps not now
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Old 25th May 2004, 04:02 PM   #15
G is offline G  United States
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Default Re: Good first amp

Quote:
Originally posted by chrish
Thanks for the input guys,

Maybe I should have mentioned that I am in the process of building an active crossover, 24db/octave 80hz based on Rod Elliot's pcbs so that a pair of subs can handle the lows. Will basically be following Lynn Olson's suggestion http://www.nutshellhifi.com/ME2txt.html#sw

Will this ease the required power for the main speakers? Thought I had found the ideal project, perhaps not now
No. It will cause a more uneven load to be presented to the amp. I would look for something that could produce 10 watts or so. Maybe a push pull triode amplifier. I don't think the little Zen is going to match up very well with that setup. What type of music do you listen to? What is your budget?
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Old 25th May 2004, 11:39 PM   #16
chrish is offline chrish  Australia
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Thanks for taking the time to respond. I listen to classical, jazz and even alternative rock... Budget, that is a more difficult question. I am currently building a four channel chip amp using BrianGT's boards from the chip amp forum. I wanted to build a tube amp as a project to compare/contrast with my solid state amps. I do not want to go so cheap that I build an amp that is going to be a dissapointment, but neither am I interested in going "over the top" on a first project. The Zen select kit, at around $700 looked to be in the ballpark price wise. I have read Menno van der Veen's book Modern High End Valve Amplifiers, and his UL40 kit looks interesting too, 12watts per channel in triode mode http://www.amplimo.nl/en-us/dept_21.html
Any thoughts on this amp?

Thanks again for your helpful advice, I am very new to this tube stuff and appreciate your help.

Chris
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Old 26th May 2004, 02:41 AM   #17
Jhovis is offline Jhovis  United States
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Chris,
I quickly reread the previous page and I didn't see a mention of the Bottlehead kits. If you're interested in two monoamps, the Bottlehead Paramours receive rave reviews also. www.bottlehead.com
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