SET amp owners thread

[morricab]

No it doesn’t. I heard it with Airtight EL34 34 watts, Riviera 50w hybrid, Jadis 100w integrated, Silvercore 833c 20 watts in direct compares with those amps I mentioned. And a German 300b 20 watts with the EML 320 XLS. Also with Kondo overture EL34

And the NAF 2a3 bested all of these? Have you heard the 300b version?

 

[DasguteOhr]

I am sure this sounds good.

is a Swiss company, maybe even around the corner from you. the new amps use monolith magnetics opt and interstage transformers.

atelier du triode

www.atelier-du-triode.com

 

[bonzo75]

And the NAF 2a3 bested all of these? Have you heard the 300b version?

No I haven’t. It had KR 2a3 in it. The airtight 300b was also good.

 

[Atmasphere]

Yes I have read your posts on seeds SETs and had the M60 mk3.

The fact that Devore responded better and better as we went down the power rating was quite audible. There were other speakers in the room that did worse as we went lower in power. That was also audible

Usually the way you decrease power is by turning down the volume. Is that how you did this 'test'?

FWIW the M-60 Mk3 was discontinued about 12 years ago.

How do you know it was the DeVore that was 'responding better and better'? Could it have been the room sounding better with less sound pressure? How well was the front end of your system damped from room borne vibration? Can you see that this is still a Hasty Generalization?

 

[bonzo75]

Usually the way you decrease power is by turning down the volume. Is that how you did this 'test'?

By that I meant lower power amps sounded better. On other speakers they didn’t and you could hear them constrained, compressed

 

[Atmasphere]

By that I meant lower power amps sounded better. On other speakers they didn’t and you could hear them constrained, compressed

You're still dealing with a limited sample size. If I can show you opposite testimony using the same speaker, what does that mean?

Apparently one thing we both agree on is the DeVore is an easy and musical speaker to drive.

 

[DasguteOhr]

By that I meant lower power amps sounded better. On other speakers they didn’t and you could hear them constrained, compressed

This is due to the impedance curve: not lower than 7 ohms. It plays down to 40 Hz without any loss of sound pressure. Between 1 and 3 kHz, the speaker will play 2 dB louder. With an amplifier, the sound is livelier without feedback.
You can see all of this from an impdance curve without listening to him.
Works good with set amp,but I would not combine high-resolution analytical sounding tubes with it, it tilts the sound image into the unpleasant.e.g newer siemens or ribbed plate tfk.

 

[Kingrex]

is a Swiss company, maybe even around the corner from you. the new amps use monolith magnetics opt and interstage transformers.

atelier du triode

www.atelier-du-triode.com

View attachment 153351

Why do so many people use 2A3 or 300B. My amp also has a lot of Monolith iron. Its a KT PP amp. I asked about a 300B or 2A3. I was told they are good tubes, but an 811 can be an even better tube.

 

[Lautreamont]

Possibly mk4 is better than the 3, haven’t heard it.

With Devore, I found the best results from NAF2a3 10 watts and airtight 300b, after trying many higher powered sets and push pulls

DeVore is also a nice choice and somehow I have always compared their speakers to those of Audio Note. It appears that Audio Note also tends to be a bit exaggerated when stating the efficiency.

 

[bonzo75]

DeVore is also a nice choice and somehow I have always compared their speakers to those of Audio Note. It appears that Audio Note also tends to be a bit exaggerated when stating the efficiency.

Devore needs more space at the side and the back than AN.

 

[Klonk]

is a Swiss company, maybe even around the corner from you. the new amps use monolith magnetics opt and interstage transformers.

atelier du triode

www.atelier-du-triode.com

View attachment 153351

Do you know why that is? https://www.definitiveaudio.co.uk/product-ateleir-du-triode.html It says country of origin "Italy" ?

 

[DasguteOhr]

Do you know why that is? https://www.definitiveaudio.co.uk/product-ateleir-du-triode.html It says country of origin "Italy" ?

Maybe they moved from italy to Switzerland. The amps now say Switzerland on them.

 

[DasguteOhr]

Why do so many people use 2A3 or 300B. My amp also has a lot of Monolith iron. Its a KT PP amp. I asked about a 300B or 2A3. I was told they are good tubes, but an 811 can be an even better tube.

This tubes has a large following; I think a good designed amp will sound excellent with any tube. Personal preferences play a role. For example, I love the RS 1003 pentode.


P.S
The more expensive and rarer tubes become, the more unknown tubes are used for audio. A nice blog from Thomas Mayer is "Tube of the Month."

 

[Don_Camillo]

6CB5A SET

 

[Lagonda]

DeVore is also a nice choice and somehow I have always compared their speakers to those of Audio Note. It appears that Audio Note also tends to be a bit exaggerated when stating the efficiency.

And their pricing !

 

[microstrip]

This is due to the impedance curve: not lower than 7 ohms. It plays down to 40 Hz without any loss of sound pressure. Between 1 and 3 kHz, the speaker will play 2 dB louder. With an amplifier, the sound is livelier without feedback.View attachment 153355
You can see all of this from an impdance curve without listening to him.
Works good with set amp,but I would not combine high-resolution analytical sounding tubes with it, it tilts the sound image into the unpleasant.e.g newer siemens or ribbed plate tfk.

We have to combine all the data from the review to get such information.
https://www.stereophile.com/content/devore-fidelity-orangutan-o96-loudspeaker-measurements



The speaker response is flat, except for small dips around 1200 and 2400 Hz, when driven in voltage mode with a very low impedance SS amplifier, as usual in frequency response measurements. Besides the 1-3kHz It will also show a peak at around 60Hz - some care must taken when positioning the speaker, also any vestiges of hum can easily show!

 

[DasguteOhr]

We have to combine all the data from the review to get such information.
https://www.stereophile.com/content/devore-fidelity-orangutan-o96-loudspeaker-measurements

View attachment 153410

The speaker response is flat, except for small dips around 1200 and 2400 Hz, when driven in voltage mode with a very low impedance SS amplifier, as usual in frequency response measurements. Besides the 1-3kHz It will also show a peak at around 60Hz - some care must taken when positioning the speaker, also any vestiges of hum can easily show!

I think this peak is more likely due to the room it was measured in. Honestly, anyone using this speaker is more likely to use SET amps or small single-ended transistors.
In an anechoic chamber, measurements in the bass range are more accurate

 

[DasguteOhr]

6CB5A SET

View attachment 153389

Thomas Mayer shematics?

 

[Don_Camillo]

Thomas Mayer shematics?

Yes, Thomas and me started this project for Roehren & Hoeren back in that days. The picture was taken at one of the shootouts with several variants of the schematic and some variants of compoents used. We tested e.g. output transformers from James, Tango, Lundahl, Gerd Reinhöfer, Thöress and others but also combinations of the driver stage with different power tubes (6CB5A, 12E1, 300B, 45).