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61
Amplification (Pre/Power) / Re: Headphones is this the Worlds most expensive
« Last post by kajak12 on March 20, 2018, 10:01:52 PM »
Its about time you hear the real truth with your ears :-*
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Amplification (Pre/Power) / Headphones is this the Worlds most expensive
« Last post by stevenvalve on March 17, 2018, 03:23:57 PM »
I went to Audio connection last week and had a listen to these headphones, the price was around $85000 Australian. Yes that is right $85000. What do you get for that money. Well it did sound very good. What brand you Ask, i think they are Sennheiser's Orpheus. Its probably worth it because it does have a volume control. I am taking orders.

https://www.digitaltrends.com/home-theater/senneheiser-reveals-50000-orpheus-headphones/
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Amplification (Pre/Power) / Re: Leak Stereo 20 Modifications
« Last post by stevenvalve on March 17, 2018, 03:08:17 PM »
I had a 4 STLX Copper caps laying around so i put them to good use. Out went the 4 Jupiter Copper foil caps and i installed 4 of these caps. Why because i could. Now it is just different, but excellent, basically its name your poison, but as i said before its no longer a cheap rebuild.
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Amplification (Pre/Power) / Re: Stax DA50 mono amplifiers
« Last post by brenden on March 12, 2018, 09:47:50 AM »
Probably easier than a cd  player Steve  .  Best to start with a better mouse trap . Begin with amps that  have good power supplies   .  I prefer fet inputs with bipolar  outputs .
   The Staxes have quality  in all the main areas  ,its just a matter of replacing the cheap  mylar caps with  top quality caps .  I am beginning with caps from my parts box  to get a baseline for improvements then may try some jupiters etc . So far results have been very encouraging.  The areas for further improvement  i see, seem to align with the key areas that Jupiters and Duelunds  are good at .  I may need some technical advice  with  input filtering    at some stage but for now  keeping the design mostly stock apart from  reducing the bypass caps from 1uf to a quality .01uf ..
   I have modded the DA100s and these are almost  the same  but only 50w  so lessons learned  form the DA100 willl be used on these .
   
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Amplification (Pre/Power) / Re: Stax DA50 mono amplifiers
« Last post by stevenvalve on March 12, 2018, 02:12:47 AM »
Nice toy to work on. It will be interesting to see the necessary modifications of a transistor amp.
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Amplification (Pre/Power) / Re: Stax DA50 mono amplifiers
« Last post by brenden on March 11, 2018, 02:33:48 AM »
Front .
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Amplification (Pre/Power) / Re: Stax DA50 mono amplifiers
« Last post by brenden on March 11, 2018, 01:08:09 AM »
This is the circuit board  with th excellent   2sk 240 dual fet in can .
   The larger brown  1uf  bypass  caps are gone . They really ruin the sound .  They have been replaced with  .01 uf auricaps . After that simple replacement it is a different amp altogether. Everything improved from bass mids and treble . Much better timbre and detail .
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Amplification (Pre/Power) / Re: Stax DA50 mono amplifiers
« Last post by brenden on March 11, 2018, 12:57:56 AM »
Side view  showing heatsinks . Stax used a liquid sodium cooling system for heatsinks .
     Some of the mylar caps have been replaced with  very rare  Rubycon stlx  film and foil non inductive  caps .
   These are fantastic sounding caps  with extremely low esr and  made by rubycon  as  a high end partner for  their expensive    black gate capacitors  .
 
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Amplification (Pre/Power) / Stax DA50 mono amplifiers
« Last post by brenden on March 11, 2018, 12:26:48 AM »
Stax da  50  mono blocs   now paired  with the Stax CAX  Pro .
   These are the small brother to to my
Stax DA100  full class A amps .
   The DA50 is   50 watts per channel 
   
 Modding has begun and already showing signs of greatness .
   
70
Tubes / Re: Valve operating points for best sound
« Last post by stevenvalve on February 12, 2018, 12:26:46 AM »
Open question regarding 6J5's.  Does anyone have a set of recommended operating points for these valves?  I have the data sheet, but nothing beats actual setups.  They are being used as part of a phono amp with ecc88's upfront and 300B's downstream.
V
I have some tasty 6J5s here rare brown base. Half of a 6SN7. I find with most tubes there is no real set parameter, usually is just trial and error, and you are right there is a sweet spot. That is why a variable resistor is handy. 
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