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Doshi Jhor 90W monoblocks

Has anyone had experience with a Dohsi John 90W amp? I am looking to use them with my SonUs Faber Olympia IIIs. Not much information on the web. 

Basic Specs
EL34 Pentode output tubes – 90 watts per channel
Input Impedance: 75k ohms
Sensitivity: .775v rms for full power
Feedback: 22db
Output Impedance: 4 ohms
Output Power: 90 w
 
Here are the specs for my speakers
FREQUENCY RESPONSE
35 Hz – 30.000 Hz, tuning port included.
SENSITIVITY
90 dB SPL (2.83 V/1m). NOMINAL
IMPEDANCE
4 ohm.
SUGGESTED AMPLIFIER POWER OUTPUT
50W – 300W, without clipping.
LONG-TERM MAXIMUM INPUT VOLTAGE (IEC-268-5)
22V rms.


Room 13 X 15 feet 195 sq feet
ceiling 7 feet
Total volume = 1365 feet



Source:     MiniMac 2014 3.0GHZ I7 16 GB 4TB SSD as NAS
Software:     Roon, Tidal
DAC:       PS Audio Directstream
PreAmp:     As phono stage Moving Coil Anthem Pre 1
PreAmp:   Doge Clarity preamp used as line stage and MM phono stage
Turntable:     VPI Aries Limited Edition
Speakers:   SonUs Faber Olympia III
Sub:       SVS SB13-Ultra
Power:     Furman Elite-15 PFi
Cart:             Denon MC DL-103R
SUT:       Bob’s Devices SKY

I am a newbie. Any advice would be appreciated. Thanks!

chazark123
tricon_dave
96 posts
 
I have been using my Doshi Jhor amps (original versions) and Alaap full function preamp with Amati Futuras for the last 1.5 years. I love the combination. The Doshi gear were purchased to go with my Sashas and that was a great system. But the Doshi and Sonus Faber combination is even better. Before Doshi, I had Lamm and Audio Research amps and preamps.   My room is 17 X 34 X 9, and the amps drive the speakers very well in the large space.

If you want another opinion, you might call Larry Marcus at Paragon Sight & Sound. He sells Doshi and Audio Research, and also sells Sonus Faber and Wilson. He’ll give you a straight answer.

One more thing, before I bought my Sonus Faber speakers, I called Nick Doshi to ask him about what speakers he feels are excellent with his amps and he recommended Wilson (of course), Harbeth, and Sonus Faber.

If you go with the Doshi amps, I’ve had great success with Telefunken EL34 output tubes. If you want more information or want to talk, pm me or send me a separate email at daveneumann01@gmail.com

Regards,
Dave
gdnrbob
4,444 posts
 
If you want to try tubes, I would look at Atma-Sphere.
But, if you want to try the Doshi, then you could get some rca-xlr convertors from Jensen for about $300. I spoke with Ralph (Atma-Sphere) and he said they shouldn't do much to the sound- I was thinking of using them when I bought his amps). 
I would then look for a pair of Zero Autoformers to help with the 4 ohm response of your speakers.
Hopefully, Ralph will see this post and give you the most accurate information.
Bob
lak's avatar
Ag insider logo xs@2x
lak
4,619 posts
 
I was going to suggest what Dave said; phone Larry Marcus at Paragon Sound. Larry could answer your questions and give honest comparisons to other amps.
chazark123 OP
5 posts
 
Everyone,
Sorry for the delay in responding, I have been traveling. Thank you for your excellent suggestions. I did have an opportunity to audition the Doshi Jhor with a set of Sonus Faber Olympia III speakers. On one hand, I found this to be an excellent amp and clearly well constructed/ engineered with superb sound staging and an impressive sound floor better than what I am currently using. To my surprise I found the sound of this tube amp "fuzzier" than I thought it would be especially with the mids.

I do not think this is inherent to the amp, rather simple the difference between a tube vs solid state. I am currently using a tube preamp which I suspect along with my legacy Acurus A 150 SS is giving me the warmth I am looking for.

But... you know the drill, always looking for something to tweak and improve.  I hope to audition some ARCs in the near future.
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