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Old 27th November 2002, 01:24 PM   #1
G is offline G  United States
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Default Ability of a PP 2A3 amp to drive 90db speakers?

Hi all'

I was wondering if a PP 2A3 amp would be able to drive a set of Wharfedale MFM-1's (90-91 dB 1watt/1meter) satifactorily? The thing that I'm concerned about is bass response. The amp will put out about 10 watts before clipping into an 8 ohm load. I listen to jazz and old rock & Roll (some new stuff). Opinions?

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Old 27th November 2002, 01:56 PM   #2
Joel is offline Joel  United States
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Well, do the math:
90dB........... 1W
93dB........... 2W
96dB........... 4W
99dB........... 8W
100dB......... 10W

Last time I checked, 100dB is LOUD. You won't want to be in the room. 120dB is getting near permanant hearing damage.

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Old 27th November 2002, 02:07 PM   #3
G is offline G  United States
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Your right Joel. 100 dB is LOUD. Thanks for the opinion.

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Old 27th November 2002, 02:35 PM   #4
PassFan is offline PassFan  United States
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Keep in mind that 100db is at 1 meter. At 2 meters it drops to 94db, at 4 meters it drops to 88db.

Every doubling of power gives a 3db increase. Every doubling of distance takes 6 db.

So, it depends on the room as well. Still though, unless your in a huge family room it should be loud enough. Your bass response will depend on the amp design and not the amount of power you push. Some say a SE 300B, or 2A3 is lacking in that area. I could'nt say as I've never heard one of them. Good Luck
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Old 27th November 2002, 03:56 PM   #5
G is offline G  United States
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Well my "listening room" is about 12'x15' so maybe it will work out OK. Also it is a push pull 2A3 amp so hopefully the bass won't suffer.

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Old 27th November 2002, 06:22 PM   #6
Joel is offline Joel  United States
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I have a 10'x12" living room, and a .8 watt power amp. It's plenty loud, and has lots of bass. I think you'll be fine.
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Old 27th November 2002, 06:34 PM   #7
dice45 is offline dice45  Germany
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G,
if you don't want your eardrums to kiss each other, a PP 2A3 will be fine and if the amp is built properly, you will be happy with the low end reproduction. And with the rest too.
10Watts? only if the amp is running in AB1. On ClassA you won't get more than 7 Watts, rather 6 Watts. In classA you exactly get twice the SE power.
However, the better matched the tubes are, the better overall sound is.

So: don't go for expensive vintage 2A3 single plate, getting them match will make you broke. Hey, you could buy my 2 pairs of matched 2A3 single plate .. i got them for exactly that purpose ... then you have 2 pairs, enough for your amp. But after those are worn and you need new ones .. no, bad conscience, cannot recommend it.
You are better on with premium matched pairs of Sovtek 2A3 monoplate once you need nu tubes. And ... if the amp is designed to run with 15W plate dissipation max as is prescribed for pre1935 2A3, your Sovtek toobz run very conservatively. They rather make 25 than 18W plate dissipation. In fact, it's a 300B which just did miss the 300B marks. But it is sounding like 2A3. A very nice one.
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Old 27th November 2002, 07:13 PM   #8
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Default 2A3

Hi,

At home I use a PSE 2A3 amp with something no bigger than your Wharfedale at very satisfactory levels.
I never felt the need to push the volume control past 11.00.

I've been using the Svetlana 2A3s since the became available and in this amp they sound even better then any vintage 2A3 I threw in.
Definitely a lot better than the chinese stuff I used to use at first.

Ciao,
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Old 27th November 2002, 07:40 PM   #9
SHiFTY is offline SHiFTY  New Zealand
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I have used a 2W ECL82-SE amp with my speakers (89dB B&W DM100i bookshelf models) and it is quite loud, even with bass heavy music... Easily loud enough for reasonable listening levels, and actually gives a pretty good punch in the bass. Distortion only sets in at the absolute max (i use a little NFB) You can move the cones of the woofers by at least 2cm.

With 10W, you will be able to totally crank it. And if you are using sovtek 2a3s, you can run the plate dissipation up to 28W to get ~20W per channel in PP in class AB (pretty worthwhile if you use a little NFB).

~h~
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Old 27th November 2002, 07:48 PM   #10
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Default that should be enough

the amp I use (schematic posted here Emperors new clothes and the sound of tubes )
only puts out 3.8 watts. I use average studio type monitors and it gets PLENTY loud for living room listening.

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Robert Morin
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