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AUDIO FORUMS >> General Discussion and Support >> Torii MK III vs. MK IV
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Message started by piezoman on 03/07/21 at 20:13:44

Title: Torii MK III vs. MK IV
Post by piezoman on 03/07/21 at 20:13:44

what are the differences between the two?

any discernable difference in sound?

Title: Re: Torii MK III vs. MK IV
Post by Tommy Freefall on 03/07/21 at 23:28:00

Per Steve D. here are the changes from the Mk III:

*I have deleted the bias switch for the output tubes. It never did much in the MK III and is not needed in the MK IV.
*I have increased the gain of the input stage by about 20% giving the amp more slam and tighter control
*I have eliminated the adjustable bass dampening control, no longer need it with problematic speakers due to the next change.
*In place of the adjustable bass dampening control I have created a re-constructive feedback circuit that improves clarity, detail, and definition at all frequencies. It is on a switch so that you can use it or not use it. (everyone will likely use it) This mod replaces the bypass caps that were on the cathode of the input stage. Those caps eliminated the naturally occurring local negative feedback in that tube. Instead of a bypass cap, I use the output transformer in series with a couple networks that float the output stage above ground slightly. The result is less phase angle distortion resulting in better transparency. This was an accident, that turned into another discovery. It's one of the cooler things that's happened in the past couple years and it will be fun to here peoples impressions of it as they get their MK III's updated.
*The input switch is now centered behind the volume control.
*The power switches are now rocker switches vs. toggle switches.
*The chassis can now accommodate either a single volume control (as shown) or a volume control for each channel.
*The chassis is now steel with our new textured black powder coat finish and weighs 6 pounds more than the aluminum it replaced.
*Beeswax caps are now standard.
*The treble control has been redone and now makes only a very slight adjustment to the treble above 5K, whereas before it was capable of cutting all the way down to 500 Hz. The result is a bit more air.

Title: Re: Torii MK III vs. MK IV
Post by piezoman on 03/07/21 at 23:36:22

Thanks Tommy

That's quite a list of improvements