2. analog
  3. 1174275589

tubes and analog

I just "upgraded" from a Mac SS integrated to a Prima luna dialogue 2 tube amp. The reason that I changed amps was that i assumed that the tube amp would be a better match for my Zu Druid speakers. The amp change was a big improvment for listening through my CDP....but not so when listening to my Rega P9. I had to switch to my spare SS phono stage (Graham slee) to get it to sound right. I was using a tube phono (AES) with my Mac. In Short, my tube amp with SS phono stage is not really an upgrade from my Mac with Tube phono stage. My question is.....should i consider a further upgrade to a better tube phono pre or is it simply that a change from SS to Tube amp is more "pronounced" in digital playback?
csmithbarc

Showing 4 responses by audiofeil

audiofeil
4,011 posts
 
>>but it is totally unfair to make the kind of statements<<

The truth isn't always fair.

Regards and enjoy the tubes.
audiofeil
4,011 posts
 
Here are some claims/concerns about the "wonder" product they've been trying to sell in the threads but haven't addressed:

>>Claims to have an unprecedented flat frequency response from 0.01Hz to 1 mHz<<

Well thatÂ’s crap as Spectral designs and others go beyond that.

>>Claim of 150 dB common mode rejection<<

More crap. The halves of a differential circuit must be matched within one - thirty millions (the deviation is one unit for thirty million units) - while even "dual" devices, made from a single crystal, are matched within one to a hundred. There is nothing in existence to measure such deviation. For the readership, in tube designs/ matching within one to thirty is common and OK.

>>Claim they match the discrete devices a million times as precisely as the others do.<<

Obviously, this is pure BS and more BS.

>>Claim distortion of 2/10000 (two - ten thousands of a percent - i.e.) the claimed distortion is minus 104 dB.<<

More crap. This is by far impossible to measure with any equipment on the phono level because they would have to have a device with the resolution to picovolts, and such instruments do not exist.
Additionally the claimed distortion figure is over 30 dB below (!) the theoretical noise floor for an MC cartridge, and 5 times as low as the lowest noise floor from any known solid state device in existence.

For any engineer, such ridiculous claims make the design and the designers look anything but real and serious. However, it makes for great promotion which is the issue now correct?
audiofeil
4,011 posts
 
Mab33, based upon a view of your system you appear to be one of his customers. You have a fiduciary interest in the product so your remarks are tainted.

Can you say "shill" with me?
audiofeil
4,011 posts
 
>>Raul is as honest as a person can get.<<

Aren't you his business partner?
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