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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
goldprintaudio's avatar
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goldprintaudio
502 posts
 
I've never read anything that was less then positive when it comes to Doshi, so I imagine the Johr's are very nice amps.

Are you specifically looking for an amp with EL34 output tubes?  Or any specific reason you are considering the Doshi's?
joecasey
484 posts
 
Doshi Johr is voiced for Wilson Sasha's and bit on dark side so IMO not best match for SF.   For tube amps, checkout ARC.
chazark123 OP
5 posts
 
I am looking at a used Johr and would like to try tubes. My preamp only has RCA unbalanced inputs. This would be my first tube amp with a speaker known to be hard to drive at 4ohms
lostbears's avatar
lostbears
538 posts
 

 I have Sonus Faber Elipsa SE speakers which are driven by an Audio Research Ref 110 with KT120 tubes. Audio Research is an excellent match with Sonus Faber.  I would choose an amp that uses 6550/KT120/KT150 tubes and at least 100 watts per channel. If you don't have enough power the bass can sound a bit sloppy. 

 The preamp has more impact on the sound than the amp. But it is all about synergy. You want to choose components that work well together.


chazark123 OP
5 posts
 
If I am not mistaken, most if not all audio research amps only have balanced connections. I would need to use some type of XLR to RCA converter. Would such a converter have a negative sonic impact?
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