ait

Responses from ait

Relationship of amplifier sound to transformer quality?
And yes, the transformers have a huge effect on the sound of tube-based amps, preamps, DACs, whatever. 
Relationship of amplifier sound to transformer quality?
Monolith Magnetics makes some very nice (and expensive) transformers. The OPTs I use in my 833C SE amps weigh 62lbs each, with amorphous double-C cores and virgin teflon interwinding insulation. Here's a picture of one during its construction.http... 
Where do you guys buy tubes?
I buy mine at hamfests and antique radio shows, and occasionally on ebay. On occasion, the shows can offer incredible deals, like 10 #26 DHT tubes for $50, or 15 #80 coke bottle rectifiers for $40, and there's usually someone there with a tube tes... 
ZU event (version 1) speaker cables on sale/closeout
I have the Event ICs and they are excellent. A definite improvement in my system over the Zu Varials I had previously. 
DIY AC Cable advice
I've used Belden 83808 Teflon insulated, double shielded, 12 gauge silver plated copper and wattgate connectors to make a very nice power cord. Stiff but good sounding. A little black tech flex over the red Teflon looks nice, too. 
How important are speaker cables to the sound emanating from the speakers?
I did remove the crossovers from the boxes. I built separate enclosures for them (after replacing the cored inductors with much larger air cores there's no way they'd fit in the box anyway). The crossovers in the enclosures were then wired directl... 
How important are speaker cables to the sound emanating from the speakers?
I noticed a big improvement by selling my speaker cables, removing my speaker binding posts, and wiring the crossovers directly to the amp outputs with short (18") Cardas copper litz wire (11.5gauge) in twisted pair. Sounded much better than my ex... 
Who tried Class D only to return to S/S or Tube
Kijanki, The choke needs to be of "critical inductance" at minimum, for this type of supply to work properly.Lcrit = V(dc) / I(mA)So higher voltage and/or lower current require a bigger choke. This type of supply was often used decades ago when ... 
Who tried Class D only to return to S/S or Tube
Your link shows a cap input supply, by the way. Put a choke between the rectifier and cap and you get a choke input supply. 
Who tried Class D only to return to S/S or Tube
I showed the current waveforms through the first PS Capacitor in each case. It's clear that in one case there are sharp spikes through the cap, in the other there are not.┬áThe rectifier is not directly charging the cap, it's charging the inductor,... 
Who tried Class D only to return to S/S or Tube
Kijanki,I believe you misunderstand what a critical inductance choke input supply is. The input choke serves to smooth the current draw - I have attached two simulations of the power supply I use in my amps showing the current draw in the first po... 
Who tried Class D only to return to S/S or Tube
Kijanki, in your zeal for Class D I'm afraid you mischaracterize linear power supplies. Not all are cap input.Choke input linear supplies do NOT draw power in "huge narrow spikes". In fact they draw power continuously throughout the conduction cyc... 
Who tried Class D only to return to S/S or Tube
Oh, and prior to the Gilmore Class D amps I owned Flying Mole Class D monos. The Gilmores were better than those, but the FMs were still nice sounding. I also auditioned NuForce Ref9 SE monos and thought they sounded awful - harsh and screeching a... 
Who tried Class D only to return to S/S or Tube
I owned Gilmore Raven stereo amp for a few years, then upgraded to the Raptor monoblocks. Was happy with them for several years as well. Then I built a pair of two stage, direct-coupled SET monoblocks, with 6E5P driver and 833C power tubes, produc... 
Tube Watts vs. Solid State Watts - Any credence?
Geez, guess I'll have to send both of my 62lb output transformers back, then...