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donsachs

Responses from donsachs

300b lovers
Thanks for the positive feedback from all so far.  The room was a bit of a struggle to get things to sound good, but after a whole afternoon and evening of getting furniture moved out and putting acoustic treatment up we pretty much tamed it.  We ... 
300b lovers
Current production Chinese 45 tubes are about $350 per pair plus shipping.  I may try a quad in my Lampi Pacific DAC.  I quite like the 46 tube there with adapters.   The current production European 45 tubes are twice that price.  That said, if ru... 
300b lovers
I know that when I have my system "cranked" and I measure the level it is about 81-83 dB.  I rarely listen at that level.  As was stated above, the hallmark of a good system is that it has enough resolution and balance that it can be enjoyed at lo... 
300b lovers
I like to listen at the volume a live performance would be at.  Obviously, Pink Floyd concerts would be loud, but a jazz combo should sound like you are in the club at normal levels, not screaming at you.   I will try to play at various levels whe... 
300b lovers
I have had the matching preamp running quite nicely for about 10 days and I will say the combination doesn't sound like anything I have ever heard.  First off, with my 97 dB speakers you literally have to put your ear to the woofer to know the sys... 
300b lovers
I just have the first production one running  in now in prep for Seattle show.  It will be at least $5000 as it is cost and labour intensive and all very high end parts.    
300b lovers
@alexberger  Hi I am sorry, but I am not giving anything about the design of the amp away.  I had ITs custom wound for the project.   My amp is PP, but if you need a load resistor with your circuit then I would try two kinds.  A good quality wir... 
300b lovers
@drbarney1 I agree with Lynn in that I won’t work with power supplies over 550-600V. The teflon mil spec wire is all rated at 600-630V so you would have to source 1200V wire for headroom. All normal parts are rated at 630V so you would have to s... 
300b lovers
I would think the majority of people who buy class A amps of any sort are quite well aware of how hot they run and are more than happy to deal with it for the sonic benefits.   As far as separate AC, that notion is absurd  
300b lovers
@pindac   Exactly my friend, exactly.   Once the power supply is right,  all the operating points are right and there is some serious listening, then the tuning begins.   We are almost there...  
300b lovers
These amps are still prototypes and being tuned as we speak.  So what Cloud wrote was in reference to the first prototype a year ago.  Spatial Audio Lab had that amp for maybe 6 months.   The mono amps are probably 25-30% better at least.  @whites... 
300b lovers
@atmasphere  "There are now class D amplifiers that have a distortion spectra that if you had one on the bench you would be completely convinced you were measuring a really well-behaved triode tube amplifier." Maybe.  Except that there are thing... 
300b lovers
You don't have to convince me, my speakers are 97 dB 8 ohm:) I wouldn't own an inefficient speaker because I would be doomed to SS amps, and I hate the sound of solid state devices.  
300b lovers
As Lynn said, the amps have dual regulated supplies, one for the 300b and one for the input and driver tubes.   IF the specs on that KEF speaker above are really what the review said, then the amp would drive them.   Also, as I said far above some... 
300b lovers
@curiousjim  The speakers appear to be 8 ohm 90 dB from a stereophile review.  They dip to 3.2 ohms, which isn't bad.  The amps would drive them with no trouble in any reasonable sized room.  I cannot comment on pricing until Spatial Audio figure...