• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Best tube amp clone for stereo music

Tubes4HiFi clone of a Dynaco ST-70...but upgraded to output 65 watts/channel and now called an ST-120.

I'm using TungSol KT120 tubes in mine now and it sounds very good driving modified Klipsch Heresy's. Some say better than a McIntosh MC275, but I'm not sure if that's really a good thing since I've never heard an MC275.
 
Tubes4HiFi clone of a Dynaco ST-70...but upgraded to output 65 watts/channel and now called an ST-120.

I'm using TungSol KT120 tubes in mine now and it sounds very good driving modified Klipsch Heresy's. Some say better than a McIntosh MC275, but I'm not sure if that's really a good thing since I've never heard an MC275.


best Home Amplifiers for music depend to your budget and your speakers .all tube amps are good . amps like mc275 is not best amp for audiophile. dynaco not modern and obsolete... just for listen music .
 
best Home Amplifiers for music depend to your budget and your speakers .all tube amps are good . amps like mc275 is not best amp for audiophile. dynaco not modern and obsolete... just for listen music .


He didn't ask for an 'audiophile' amp. He asked for a tube amp to clone. I suggested a tubes4hifi amp as a clone of a Dynaco amp.


And on top that what makes you think a Dynaco or McIntosh as non audiophile quality?
 

jdiego

Member
2016-05-21 11:48 pm
I'm looking for a good tube amp to build or buy, for listening to rock and blues music on my Pioneers sp-fs52 (6 ohms). I don't care about power, EQ or how many inputs it have, but it has to be powerful enough to drive the pioneers. I asked for an easy to clone amp, because the kits are not so expensive as an assembled one.

sorry for my bad english. I know my first question is a little bit pathetic and corny, but im struggling with the foreign language factor
 
jdiego, we don't know what your contruction skills are like. Have you built any amplifiers from scratch (bare parts)? If not, have you ever built an electronics kit?

How are your soldering skills?
How are your metalworking skills? Do you have tools to make holes for tube sockets, etc?

I'd say that the classic easy-to-build amp is a push-pull EL84 amp with output transformers that have 'ultralinear' screen taps, using a 6DJ8 'concertina' driver. Use the best transformers you can afford. The tubes are relatively inexpensive.

There are several good PP EL84 designs right here on diyAudio. A good basic version is Morgan Jones' Bevois Valley amplifier.
http://www.diyaudio.com/forums/tubes-valves/64110-morgan-joness-bevois-valley-amp.html

The description for that amp design is in Morgan Jones "Valve Amplifiers" 3rd Edition. I have that book and could post a schematic, but it's copyrighted material, so I probably shouldn't try that.

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jdiego

Member
2016-05-21 11:48 pm
I'm a beginner. The only electronic device I've made from scratch (with my brothers help) was a germanium fuzz face guitar pedal. It was very easy and it sounds great, but I don't know how it works.

I have good skills with tools, but I don't know a s**** about electronics. I'm willing to learn and to buy more tools, but I need a dumb-proof schematic with a printable pcb and images of how the components should be placed, or an easy kit.

Thanks to all for your help!
 
I'm a beginner. The only electronic device I've made from scratch (with my brothers help) was a germanium fuzz face guitar pedal. It was very easy and it sounds great, but I don't know how it works.

I have good skills with tools, but I don't know a s**** about electronics. I'm willing to learn and to buy more tools, but I need a dumb-proof schematic with a printable pcb and images of how the components should be placed, or an easy kit.

Thanks to all for your help!
A dynaco-clone is most likley a good starting point as the manuals and build-descriptions are unsurpassed.
Have a look at dynakitparts.com, they have a st-35 ( el84 based ) delivering 2 x 17w and is regarded as very well-sounding.
They also have st-70 ( 2 x 35w ) , the st-70 in variants are also available from tubes4hifi.com and triodeelectronics.com. Any of these will have good build instructions, and any of them is well-known and has knowledge and parts available almost anywhere.
 
Hey jdiego,

If you want an easy tube amp with really good documentation, I'd suggest the Tubelab SSE. It was one of the first amps I personally built and I did so without completely understanding how everything worked. This amp can give you about 5W (triode connection) or 15W (ultralinear connection).

For many, the easy to clone 'holy grail' would be some kind of single-ended tube amplifier. If you have low sensitivity speakers though, you have to start looking at push-pull amplifiers (Mullard, Dynacos, HK Citations).

All that said, I would suggest reading up on how tubes work (though you can't avoid it in some cases when you have to choose your own parts). Understanding the circuits, even superficially, does make things more rewarding (and addicting).

Have fun and be safe.
 

45

Member
2008-12-18 2:29 am
UK
Old-fasioned 30W Push-Pull amplifier ⋆ Lundahl Transformers

Hi, as good a documented design as I've seen, rgds, sreten.

Suitable iron is not difficult to get hold of.

Oh no! Again.....:eek::D

" the output resistance from the anode is close to the anode load resistor, whereas output resistance from the cathode is low,..."

The quote above from that document is about the concertina splitter. It is wrong. The two output impedances are the same. Not a good learning experience if there are such basic mistakes.....
 

DAK808

Member
2012-05-27 7:34 pm
I'm looking for a good tube amp to build or buy, for listening to rock and blues music on my Pioneers sp-fs52 (6 ohms). I don't care about power, EQ or how many inputs it have, but it has to be powerful enough to drive the pioneers. I asked for an easy to clone amp, because the kits are not so expensive as an assembled one.

hI, how sensitive are your speakers? If they are of high sensitivity, about 95db or more, than building a single ended amp is a good choice. SE amps are simpler with usually fewer gain stages. A se el84 amp with a 12ax7 driver tube is quite inexpensive.
If your speakers are medium sensitivity, about 89 to 94db, you could use a medium power se amp of more than 10watts/channel. A push pull el84 amp would also perform well with those speakers and maybe less expensive than a 10watt output SE amp.
If you have speakers of lower efficiency than that you should probably use a push pull amp of at least 30w/channel.
If you don't match the power level to the speakers your results will not be optimal. cheers.
 
The OP's Pioneer speakers are not efficient, to begin with. Even without derating for the impedance curve dips almost certain to be present, the nominal 6 ohm impedance requires derating to be done, as 2.83 V. into 6 ohms is 1.3 W., not 1 W. I think a good guess will be to use 4 ohm speaker taps and a real world sensitivity around 84 dB.

At a minimum, push/pull KT88s will be needed. From an economic perspective, a nice, DIY, tubed preamp driving a SS power amp of good quality seems indicated. The inexpensive speakers may sound good, but they are definitely power hungry. Once again, TANSTAAFL strikes.
 
Oh no! Again.....:eek::D
The quote above from that document is about the concertina splitter. It is wrong. The two output
impedances are the same. Not a good learning experience if there are such basic mistakes.....

Hi,

"Oh no! Again.....:eek::D"

Your being utterly tedious again as the design does not use
a concertina splitter, so your comment is tediously irrelevant.

One point, which I can't be even bothered to check if your
right or wrong, I suspect you are, is no proof of ineptness.

In fact I find your whole attitude to the article quite pointless.
You can do any better ? Quote a better article ?

rgds, sreten.
 
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45

Member
2008-12-18 2:29 am
UK
According to the 'wiz', differential output impedances from anode and cathode are equal, but common mode impedances are not. So the document is not incorrect, but it may not be complete.

I don't know who is 'wiz'. Anyway as far as signal is concerned differential Zout is what matters. Common mode Z becomes irrelevant if PSU and grounding are done right. Nothing special, really.
Like any other phase splitter if load is unbalanced the splitter will be unbalanced.