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Question Tube Amp for KEF Speakers and Pro-Ject Turntable

Megamoz

Active Member
Hello,

I own a pair of KEF R-500 floorstanding speakers
(Frequency Range: 39Hz - 45kHz (-6dB), Frequency Response: 46Hz - 28kHz (±3dB); Crossover Frequencies: 500Hz, 2.8kHz; Maximum Output: 111dB; Amplifier requirements: 25 - 150 W; Sensitivity: 88dB (2.83V/1m); Harmonic distortion: <0.4% 120Hz-20kHz (90dB, 1m); Nominal Impedance: 8 Ohms (min.3.2 Ohms))

and Pro-Ject 1Xpression Carbon turntable.

Up until now, I was using a Denon A/V receiver with them.

Lately I decided to switch to an analog system, so I wish to complete them with a tube amp. As a result of my search, I found Icon Audio's Stereo 40 MK IIIm model tube amp. Its specs are as follows:

So what are your opinions, do they match or is this amp compatible specs wise with the speakers? And what would be the listening experience of this set-up?

Thank you all in advance for your replies.

• All hand wired point to point
• No printed circuit board to ‘colour’ the sound
• Japanese ALPS volume pot.
• Class A, all Triode front end
• Output circuit Ultralinear or Triode switchable
• 4x EL34/KT88 precisely matched for best performance
• 1x 6SL7/6N9 first stage valve, 2x 6SN7 phase splitter
• 274B/GZ34 valve rectifier for ‘Soft start’ & smooth sound
• Standby switch to save valve life and power
• 2x 40w RMS per channel output*
• 2x 20 Watts RMS in Triode mode
• Signal to noise level -90db
• Freq response better than 20hz-20kHz +0 – 1db
• Power bandwidth 10hz-30khz
• Total harmonic distortion 0.15% at full output
• Suitable for 4 to 16ohm loudspeakers
• Supplied with attractive valve cover.
• Choke regulated power supply
• Solen audio caps, or Jensen copper foil in paper and oil
• Silver PTFE audio cable
• Custom hand wound Tertiary output transformers
• Gold plated Input & speaker terminals
• Four line inputs – CD, Tape, Tuner, Aux
• Tape monitor circuit with ‘Record Out’
• 250mv input sensitivity.
 
D

Deleted member 781788

Guest
Icon audio makes good amps for reasonable money.
You wouldn't go wrong.
Your speakers are rated at 88dB sensitivity, which is decent.
At 40W ultralinear, they would go pretty loud - even at 20W triode they still provide very decent volumes.
Beware of two things:
1- your speakers impedance drops to a 3.2 ohms at some point, Icon audio quotes 4-16 ohm, it may be nothing, but you need to try them out.
2- you will need a headamp for your cartridge.
Try to listen before you buy, my opinion (or any body else's) don't mean much - yours does.
A good dealer would agree on home trial of a few days.
Good luck.
 

Megamoz

Active Member
Icon audio makes good amps for reasonable money.
You wouldn't go wrong.
Your speakers are rated at 88dB sensitivity, which is decent.
At 40W ultralinear, they would go pretty loud - even at 20W triode they still provide very decent volumes.
Beware of two things:
1- your speakers impedance drops to a 3.2 ohms at some point, Icon audio quotes 4-16 ohm, it may be nothing, but you need to try them out.
2- you will need a headamp for your cartridge.
Try to listen before you buy, my opinion (or any body else's) don't mean much - yours does.
A good dealer would agree on home trial of a few days.
Good luck.

Thank you for your reply. Just a quick question, by headamp, you mean preamp for Turntable cartridge? I already have one from Pro-Ject. BTW, the cartridge is MM.
 
Last edited:

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