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In Reply to: RE: enough power? posted by rws on November 15, 2014 at 17:10:40
All you need is a good two Watt amplifier.
Ninety percent of the time you will be listening at 100 to 500 milliWatts, very seldom at 3/4s of a Watt.
Consider a DHT, Type 45 or 2A3, preferably a two stage amp.
Jeff Medwin
Follow Ups:
Please explain what a DHT and two stage? I would like to have a integrated.
Edits: 11/16/14
DHT stands for "directly heated triode", an early / simple design where the filament was the tube's cathode. ( These tubes use a 4 PIN tube socket. ) Many consider these earliest of triodes to sound a BIT better ( more direct, if you will ) than triodes with cathodes, separate from the filament supply.Such tubes, used in the output stages of amps for efficient speakers, include the Type 45 and the famous 2A3 tube, my two favs.
Most low powered audio SE amps come in three stages, (1) an input tube (2) a driver tube and (3) an output tube. It certainly does NOT need to be that way, three stages. A two stage amp will omit the number two, or middle stage, be just an input tube and an output tube. IF done properly ( a big word..."if" ) the simpler circuit will sound more transparent than any three stage audio amp in existence.
Good questions you asked !! Hope it helps. I owned K-Horns years ago. Do ALTEC A7 trip now, all good stuff. Amps are the weak link in my opinion.
Jeff Medwin
Edits: 11/16/14
The EL34 as I understand is not a true triode (actually a pentode?), but as some have said is pseudo triode. I am strongly looking at the Decware,Coincident,& Wright Audio integrateds using EL34's. If I can find a reasonably priced 2A3 or 300B integrated I would consider that. I looked at Cary but are concerned about their customer service if I have problems.
Thanks very much Bob
I am not sure, but I THINK others have said EL-34 triode connected is not such a good sounding tube !!
Get a good design, it won't break !! Can you DIY build? If so, we could steer you into something up here.
All you need is an attenuator to drive most triode amps with high efficiency speakers. The preamp is mainly used as a switching - source device. Gain from the CD player will usually drive most amps used with high efficiency speakers!!
Only if you do phono do you need a preamp, with RIAA EQ.
Jeff Medwin
George Anderson's Tubelab Simple SE is the easiest kit around and an excellent sounding 2 stage Triode wired Pentode design with a solid state Constant Current Source.
I've had El-34s, 6550s and now Gold Lion KT-88s in mine and the latter are the winners by far. The 5 Watts output will drive the OP out of his 12x15 room. The design also includes an optional volume control. Anyone can build this amp.
At the request of the Moderators,
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Any idea how much it costs to build this amp with all parts?
Around $400 with an Allied (Hammond) 6K7G power transformer, Transendar 5K Outputs and Triad choke. The board is just 35 bucks.
At the request of the Moderators,
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I am not sure exactly what they said,but I would agree that the 2A3,300B,or 45, sound better. The amps I mentioned seemed to have some favorable comments and can be had for a reasonable price. It's a matter of economics. Bottom line I would like some type of tube integrated. I really appreciate the input
Hi rws,
I can Recommend the Decware for EL34. Steve Deckart always voices his amps right. I was one $900 recently. The call it "Rachel" now.
I can't really recommend any off the shelf 300b, except the Dared they sell new on Agon would be a good starter amp. $850? Not too much to loose on either of these amps.
Jamie
Big speakers and little amps blew my mind!
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