Doug Schroeder Method, Double ic


I think this topic deserves its own thread , where use double ic through y adapters , from source to preamp, Can’t connect it from Preamp to Amp...For me the result is huge, I can’t go back to single ic....
jayctoy

Showing 4 responses by alexatpos

I have tried the double ic connection via AQ f shaped splitters, between cd and preamp. I hoped for positive outcome, but my somehow short and limited experience was that sound did not improve, I have noticed the change, but the sound I get would be best described as a kind of loudness effect. Perhaps its releted to the gear I use. (tube amp and preamp) I will not desmiss the idea completely, but for know I have no doubt that my current set up is better with regular connections. On the other hand, I am using the Franco Serblin Lignea monitor speakers with Yter speaker cables (same manufacturer,) and I ve read somewhere that doubling the speaker cables produced great results. Perhaps in the future I would be able to check that as well and report my findings.
Douglas, by all means,no problem. Here are photos with specs.
The tubes are 6550 and ECC 83, all Tung Sol

http://www.highendshop.gr/images/P/UnisonResearchp30.jpg

P30K Technical characteristics
  • Type : Stereo-mono Valve Amplifier.
  • Output Stage: single ended, ultraliner, parallel
  • Classe: A pura
  • Output Power: 30 watt ( stereo ), 60 watt ( mono )
  • Output Impedance: 4 – 8 – 16 ohm ( stereo ) 2 – 4 – 8 ohm ( mono )
  • Input Impedance: 47 Kohm / 50 pF.
  • Feedback factor: 15 dB.
  • Valves: 2 x ECC83, 4 x 6550 / KT88
  • Power Consumption di Potenza: 280 VA
  • Dimension: 275 x 460 x h 200 ( mm )
  • Net Weight: 28 Kg / 61,8 lb
C5P Technical characteristics
  • Type: preamplificatore valvolare line / Phono*
  • Class: pure A
  • Inputs: 3 line, 1 phono*
  • Impedenza d’uscita: 800 Ohm
  • Input Impedance : 47 kOhm line, adjustable phono*
  • Gain: 52 dB phono*
  • RIAA: passive ± 0.2dB*
  • Bandwidth: 10 Hz ÷ 100 KHz
  • Valves: 3 x ECC83 line, 3 x ECC83 phono*
  • Remote Control: radio for volume
  • Power Consumption: 25 Watt
  • Dimension: 10,7 x 21 x 7,9 inches
  • Net Weight: 22,5 lbs
Player is MF, modest one, its on the loan, I can check the model if needed. Its not near versatile, regarding its functions (changing of gain) as my previous Dcs player, so I express some reserve about it. The cables used are HiDiamond D2 xlr, configurated to rca. Here are the specs for them too

https://www.dagogo.com/hidiamond-d2-and-d7-interconnect-cable-review/
Douglas, the speakers I use, Franco Serblin's Lignea  have minimum impedance of 7,9 ohm, so I have them conected on 8 ohm outputs. I do not think (correct me if I am wrong), that conecting it on either 4 or 16 ohm outputs would be helpful. Perhaps it would be interesting to know if all the people who do not hear the positive change have the similar sounding experience and on which kind of gear
Douglas, speaker outpus on tube amps are not exactly correct. It is generally known that factorys declare a ’middle’ impedance. The lower the impedance of the nominal is the bigger problem, so the transformers are counted with that in mind, typically the 4 ohm output is calculated for about 3.2 ohms and 8 ohms for 6-7 ohms. So, one level of flexibility is already included in any construction. 2) The operation of the speaker impedance above the declared on the amplifier increases the damping factor, decreasing the output power and distortion - until the moment of clipping. Working with lower impedance reduces the output power but also increases distortion. Having all that in mind, I prefer to stick to predictable solutions (right output for known impedance)
But, thank you for your advice, I do believe that is important to have an open mind, more so in audio, because there are lots of things that laymans or even experts cant explain and yet they are audible