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Old 26th September 2004, 10:59 PM   #1
icebear is offline icebear  Norway
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Default A good SE project?

I have been listening to several tubeamps the last week. OTL, p-p EL34 and p-p EL84. To my speakers (Bastani Prometheus) the Edison 24 (with EL84 tubes) was a good match. I'm thinking of building a good SE amp, and wondered if the EL84 also will make a good job in such a construction? There are maybe other tubes that will work even better? I need like 2-3 watt I guess. I would like to get some input on a good projects to work on during the winter. Appriciate som nice suggestions.

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Bjørn
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Old 27th September 2004, 12:37 AM   #2
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That's interesting.... most people seem to prefer single-ended triodes. But if you prefer pentodes, www.ax84.com looks like a good place. It's more about guitar amps, but I suppose it could work for other things.
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Old 27th September 2004, 01:23 AM   #3
mcs is offline mcs  Denmark
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You can see my SE amp here: http://stiftsbogtrykkeriet.dk/~mcs/2A3/

I don't know how good/bad it is compared to other amps, but I like it. I used the parts I did, because those were the parts I could find the day I built it

Best regards,

Mikkel C. Simonsen
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Old 27th September 2004, 01:49 AM   #4
arnoldc is offline arnoldc  Philippines
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hi, if you get get hold of the Sound Practices issue that features Gordon Rankin's 807 single-ended pentode, i recommend that. i built one myself and am pretty happy how it drives "commercial (read: 89dB sens)" speakers, like my Infinity Kappa 200. it puts out about 10W of power.
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Old 27th September 2004, 07:10 AM   #5
icebear is offline icebear  Norway
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Default Don't have to be pentode

Hi

It does not have to be pentode. I see that some of the projects connects the pentodes as triodes to avoid 3. harmonic. Any good triode project will also be appreciated.

How about some of these projects?

http://www.bonavolta.ch/hobby/en/audio/el84.htm


Bjørn
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Old 27th September 2004, 07:35 AM   #6
arnoldc is offline arnoldc  Philippines
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then a 2A3, is what i recommend. it's in the range of the power output you're eyeing and can be built relatively cheap and easy too.
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Old 27th September 2004, 09:21 AM   #7
Previously: Kuei Yang Wang
 
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Default Re: A good SE project?

Konnichiwa,

Quote:
Originally posted by icebear
I'm thinking of building a good SE amp, and wondered if the EL84 also will make a good job in such a construction?
Used as pentode the EL84 requires negative feedback on your speakers, but you can get between 3 - 4 Watt. If you use the EL84 as triode (it makes a very nice sounding Triode) you are down to 1.5 Watt or 2 Watts at best.

The way around this would be a EL84^3/5 design, using one EL84 as driver and two or four triode connected EL84 in parallel into 2K4/1K2 output transformers for around 4 or 8 Watt theoretically.

Sayonara
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Old 27th September 2004, 12:34 PM   #8
icebear is offline icebear  Norway
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Interesting. Do you have any spesific schematic for a EL84 as triode?

BTW: Thorsten, you have the prometheus. Do you think 2w is enough?

Bjørn
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Old 28th September 2004, 07:28 PM   #9
icebear is offline icebear  Norway
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Default What about this design?

http://www.bonavolta.ch/hobby/en/audio/el84_2.htm

No feedback. Good when you don't need power?

bjorn
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