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lynn_olson

Responses from lynn_olson

40+ watts SET, cost is not a problem
I agree with pretty much all the postings here. I think the owner of the new-series TAD speakers needs to be open-minded and willing to travel to audition these very expensive amplifiers. I would NEVER buy an amplifier unheard, and yes, they will ... 
40+ watts SET, cost is not a problem
Low-order passive crossovers (6 or 12 dB/octave) are less sensitive to amplifier output impedance (damping factor) than high-order crossovers (18 or 24 dB/octave). High feedback is the most direct method of reducing output impedance for both tube ... 
40+ watts SET, cost is not a problem
Hmm, well the Blackbird puts out an honest 22 watts, with half-second transient peaks probably around 60 watts. They power highly reactive electrostats with no issues, because of deep Class A biasing and zero feedback ... the load-lines for the PP... 
40+ watts SET, cost is not a problem
Most audiophiles who have heard tube amps have listened to "Golden Age" push-pull circuits that date from the Fifties, with a few modern tweaks like regulated supplies or a current source or two sprinkled through the design. A smaller number have ... 
Spatial Audio Raven Preamp
They are custom-design Cinemag, optimized for our circuit. They are not off-the-shelf parts, which have bandwidth problems with the output impedance of the 6SN7. The 6SN7 is one of the best tubes ever made, but is not easy to match with most tran... 
Spatial Audio Raven Preamp
I hope you folks like the Raven (which are built and sold by Spatial Audio Labs). It’s a miniature version of the power amp, with one stage of gain instead of three. It has both RCA and XLR inputs, with the balanced input going straight to the 6SN... 
Don Sachs Owners Thread
The DS Valhalla and Kootenai are hidden gems. I didn’t design them, that’s all on Don, but Spatial is selling them at very fair prices, considering what’s inside ... point-to-point wiring, high-end caps, a classic circuit, and an all-octal tube li... 
Halcro update
I find it interesting that an amp with ultra-low distortion still has scope for subjective "tuning" ... which makes me wonder how it's done. There's something in there the test instruments are not measuring.  
300b lovers
Well, keep in mind most LP’s were cut with spherical styli in mind ... specifically, the Stanton 681A with spherical styli. Over in Europe, it was the Ortofon SPU with a spherical stylus. Both were used to play the lacquer once for quality control... 
300b lovers
A quick note on the complex variable equalization seen on the Citation I: people who had extensive 78 and pre-1955 LP collections had records with wildly varying equalization curves. By the time of the stereo LP in 1958, the world had settled on t... 
300b lovers
Before getting lost in the weeds on balanced vs single-ended phono preamp design, it might be useful to review the general types and look at their advantages and disadvantages. 1) The most common is a high-gain stage with RIAA frequency-shaping f... 
300b lovers
Very pretty! Which driver tube?  
300b lovers
Just to confirm, the Raven and Blackbird do NOT use the Acrosound circuit shown above. The signal path is considerably simpler.  
300b lovers
Acrosound UL-II schematic. Note the input 12AX7 is direct-coupled to the 12AU7 driver stage, so DC drift from internal 12AX7 mismatch could be a problem. Technical analysis: The input signal goes to the top half of the 12AX7. The bottom half is c... 
300b lovers
If all these transformers disgust you, or you want to use local or global feedback, you can re-visit the Acrosound schematic from the late Fifties. Three stages, all differential, each RC-coupled to the next. It can be easily updated with modern c...