SET amp owners thread

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
Finally to the next stage of my quest.. I now have a pair of deHavilland 845-Gs that have had many parts upgraded with Kara Chaffe's assistance, a new pair of Opera Consonance 845Ss, and my 'old' pair of Allnic A-6000s.. I also received the pair of Viva Auroras, but at over 90 pounds, each amp is too heavy for me to lift, so to simply eliminate any possibility of hurting myself or the amps, I repacked the one I opened and will sell them.

The trip to/from Oakland to retrieve the deHavillands was excellent, and Dmitri was very helpful.. The Operas were VERY well packed and operated perfectly from turn-on.. I did remove their 'spaceship-landing-pods'-feet and added six 2" sorbothane feet to each.. (If I keep them I'll add a couple aluminum straps to their bottoms to accommodate 2-1/2" sorbothane feet and add some left-right stability.)

2022Sep17_DSC0308_Opera, DeHavilland, and MA-1_2000w.jpg
2022Sep17_DSC0310_Opera and deHavilland_2000w.jpg

One of the Allnic A-6000s arced a tube, blew a tube fuse and fuseholder, and burned two resistors on turn-on, and I'm waiting for parts for that.

Frankly, I'm NOT looking forward to all the work it'll take for me to choose which of these is better than my EXCELLENT-sounding Atma-Sphere MA-1s, but I'll get it done.
 

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
Finally to the next stage of my quest.. I now have a pair of deHavilland 845-Gs that have had many parts upgraded with Kara Chaffe's assistance, a new pair of Opera Consonance 845Ss, and my 'old' pair of Allnic A-6000s.. I also received the pair of Viva Auroras, but at over 90 pounds, each amp is too heavy for me to lift, so to simply eliminate any possibility of hurting myself or the amps, I repacked the one I opened and will sell them.

The trip to/from Oakland to retrieve the deHavillands was excellent, and Dmitri was very helpful.. The Operas were VERY well packed and operated perfectly from turn-on.. I did remove their 'spaceship-landing-pods'-feet and added six 2" sorbothane feet to each.. (If I keep them I'll add a couple aluminum straps to their bottoms to accommodate 2-1/2" sorbothane feet and add some left-right stability.)

View attachment 98012
View attachment 98013

One of the Allnic A-6000s arced a tube, blew a tube fuse and fuseholder, and burned two resistors on turn-on, and I'm waiting for parts for that.

Frankly, I'm NOT looking forward to all the work it'll take for me to choose which of these is better than my EXCELLENT-sounding Atma-Sphere MA-1s, but I'll get it done.
Waiting for the interesting shootout...pity about the Allnics. I have never had that happen to me with an amp before...

You should get some help to set up those Vivas...I suspect they are the best of the bunch...and totally different sounding to the Atmasphere amps!
 

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
Well, morricab, your comments prompted me to rescue the Auroras from my entryway on their ways out, to my equipment lowboy; my goodbuddyaudiofool, stronger and younger than I am, moved them.
2022Sep18_DSC0312_A-Ss and Auroras on lowboy_2000w.jpg
Tubes and music Sunday. :)
 

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
Well, morricab, your comments prompted me to rescue the Auroras from my entryway on their ways out, to my equipment lowboy; my goodbuddyaudiofool, stronger and younger than I am, moved them.
View attachment 98034
Tubes and music Sunday. :)
Beautiful! Let us know how they sound
 

Ron Resnick

Site Co-Owner, Administrator
Jan 25, 2015
11,754
7,398
1,465
Beverly Hills, CA
The Viva Aurora mono has always been one of my very favorite SET or PSET amplifiers (along with Absolare and Lamm).
 
  • Like
Reactions: KeithR

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
Actually of all the amps we've had through the shop in the last ten years the Vivas were among the very best and sounding a lot like our M-60s.
Let’s see what the proud owner has to say …
 

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
This is only my opinion of course but we also had the Lamm amps here as well. I thought the Viva to be the better amp.
I liked what I heard on their smaller horns, which is an impressive speaker for the size/cost.
 

Ron Resnick

Site Co-Owner, Administrator
Jan 25, 2015
11,754
7,398
1,465
Beverly Hills, CA
This is only my opinion of course but we also had the Lamm amps here as well. I thought the Viva to be the better amp.

Very interesting. In what ways?

To which Lamm did you compare the Aurora?
 

LL21

Well-Known Member
Dec 26, 2010
13,611
1,885
698
This is only my opinion of course but we also had the Lamm amps here as well. I thought the Viva to be the better amp.
Very interesting. In what ways?

To which Lamm did you compare the Aurora?
Yes, most interested to read more about your thoughts, Atmasphere. I genuinely wish this part of the thread does not devolve into a question of one manufacturer being seen to critique another...but rather it be seen as the good faith sharing of the personal listening notes of a [very respected] professional who has his own experience and values sound a certain way.
 

Atmasphere

Industry Expert
May 4, 2010
1,904
1,242
565
St. Paul, MN
www.atma-sphere.com
Very interesting. In what ways?

To which Lamm did you compare the Aurora?
It was the 18 Watt unit using 6C33s.

Again this is just my opinion but the Viva seemed easier to listen to, being more lifelike. One of the ways it did that was to be more pronounced in the bass. The speakers we used we still have and are not the best speaker for SETs. They are 93dB 1 Watt/1 meter and 16 Ohms. The latter part good, the former, not so much.
 

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
Running.
2022Sep19_DSF0723_845s aglow_2000w.jpg

After a brief comparison against the A-S MA-1s, probably I'll install replace the MA-1s with the Allnic A-6000s with each running three tubes (quoted to be OK to do) and get those burning in.. (With my electrical-rate plan, my conscience will allow me to run these things 20 hours per day but not between 4 and 7PM.)
 

Attachments

  • 2022Sep19_DSF0723_845s aglow_2000w.jpg
    2022Sep19_DSF0723_845s aglow_2000w.jpg
    190.8 KB · Views: 0

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
After I obtained a 'feel' for the Auroras (that I shall NOT share until I've listened again), I decided to fill the bench with other candidates.. I started with the Allnics, but the blown-tube-and-fuse amp wouldn't run with 3 tubes, so I excluded those.
2022Sep20_DSC0320_3 pairs up_2000w.jpg
These are the Viva Auroras centered, the Opera Consonace 845Ss next out, and of course the deHavilland 845-Gs on outsides.. Started burning in the deHavillands last nite and am 'idling-in' the Operas.. With my electrical-rate plan, I can get 20+ hours per weekday on quite-low (= 15 cents/kWh.) rates.

The center-channel speaker is not involved in these 2-channel comparisons, and I've set my DP to play all SACDs in stereo.. The Auroras and deHavillands are sitting on Herbies tall Tenderfoots while the Operas are on 8 2"-diameter sorbothane almost-hemispheres.. Moving these amps about is very tough on my 78-year-old back, but I'm getting it done. (The Auroras are sort of permanent until my goodbuddy visits again. :) )
 
Last edited:

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
After I obtained a 'feel' for the Auroras (that I shall NOT share until I've listened again), I decided to fill the bench with other candidates.. I started with the Allnics, but the blown-tube-and-fuse amp wouldn't run with 3 tubes, so I excluded those.
View attachment 98137
These are the Viva Auroras centered, the Opera Consonace 845Ss next out, and of course the deHavilland 845-Gs on outsides.. Started burning in the deHavillands last nite and am 'idling-in' the Operas.. With my electrical-rate plan, I can get 20 hours per weekday on quite-low (= 15 cents/kWh.) rates.

The center-channel speaker is not involved in these 2-channel comparisons, and I've set my DP to play all SACDs in stereo.. The Auroras and deHavillands are sitting on Herbies tall Tenderfoots while the Operas are on 8 2"-diameter sorbothane almost-hemispheres.. Moving these amps about is very tough on my 78-year-old back, but I'm getting it done. (The Auroras are sort of permanent until my goodbuddy visits again. :) )
I wonder how the Dehavilland GM70 version would sound compared to the 845. I have a GM70 based amp in the house now and it is a beast. Looking forward to the conclusion of the shootout. Too bad the Allnic won’t be able to partake for now…
 

charles1dad

VIP/Donor
Aug 23, 2021
336
335
290
68
Michigan, USA.
I first heard Viva Auroras in 2010 driving Trenner-Friedl RA Box speakers at CES. I’ve always liked the Viva amplifiers. I look forward to the listening impressions.
Charles
 

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
Well, we move forward, and we move backward.. One of the Operas quit making music overnite and is now making low-level snapping noises, so another pair of amps temporarily bites the dust.. I'll remove them and probably get the Atma-Spheres back up and concentrate on comparing the A-Ss, Auroras, and deHavillands.. I did discover a difference among output tubes, with the Linlai Global 845-T2BE sounding SLIGHTLY less resolving and edgier than the Linlai Global WE845 Western Electric version.

 

morricab

Well-Known Member
Apr 25, 2014
7,394
3,299
653
Switzerland
Well, we move forward, and we move backward.. One of the Operas quit making music overnite and is now making low-level snapping noises, so another pair of amps temporarily bites the dust.. I'll remove them and probably get the Atma-Spheres back up and concentrate on comparing the A-Ss, Auroras, and deHavillands.. I did discover a difference among output tubes, with the Linlai Global 845-T2BE sounding SLIGHTLY less resolving and edgier than the Linlai Global WE845 Western Electric version.

You are having some seriously bad luck with amps! Are you sure your power quality is ok? I had a friend that was constantly having issues with gear blowing and it turned out that his power was really spiky and inconsistent with lots of distortion. He installed power regenerators and the amp dying stopped.
 

jeffreybehr

Well-Known Member
Dec 16, 2018
154
111
130
78
Phoenix, Arizona USA
www.flickr.com
You are having some seriously bad luck with amps! Are you sure your power quality is ok? I had a friend that was constantly having issues with gear blowing and it turned out that his power was really spiky and inconsistent with lots of distortion. He installed power regenerators and the amp dying stopped.
The Allnics were and will be powered by a 240VAC line I had adapted from a 120VAC dedicated line.. Turning on the two Allnics the first time is my only experience with that power, so who knows? Not me.

The Opera 845Ss were powered by my PS Audio P20 regenerator and my normal long, custom-made powercords.. The Opera is the only amp in many years to fail while fed by those lines.

All my Atma-Spheres, deHavillands, and Auroras are running just finely.
 

TheMooN

Well-Known Member
Jul 30, 2013
1,456
847
370
N/A
The Allnics were and will be powered by a 240VAC line I had adapted from a 120VAC dedicated line.. Turning on the two Allnics the first time is my only experience with that power, so who knows? Not me.

The Opera 845Ss were powered by my PS Audio P20 regenerator and my normal long, custom-made powercords.. The Opera is the only amp in many years to fail while fed by those lines.

All my Atma-Spheres, deHavillands, and Auroras are running just finely.
Apologies if I am reading this incorrectly… You have constructed a dedicated power spur by simply doubling up two 120V power lines ?
You do realise that you will still be running at US mains 60Hz frequency.
 

About us

  • What’s Best Forum is THE forum for high end audio, product reviews, advice and sharing experiences on the best of everything else. This is THE place where audiophiles and audio companies discuss vintage, contemporary and new audio products, music servers, music streamers, computer audio, digital-to-analog converters, turntables, phono stages, cartridges, reel-to-reel tape machines, speakers, headphones and tube and solid-state amplification. Founded in 2010 What’s Best Forum invites intelligent and courteous people of all interests and backgrounds to describe and discuss the best of everything. From beginners to life-long hobbyists to industry professionals, we enjoy learning about new things and meeting new people, and participating in spirited debates.

Quick Navigation

User Menu

Steve Williams
Site Founder | Site Owner | Administrator
Ron Resnick
Site Co-Owner | Administrator
Julian (The Fixer)
Website Build | Marketing Managersing