MAH vs LOW OHMS

[LowOhms]

Streetwise23,

Thanks for your post. You write :

"Onto Mr. Fulton's hearing test with the old lady, yet again this is a nice story, but not a peer reviewed scientific double blind study though it is portrayed as such. I doubt anyone would believe this anecdote after reading the same person also stating that a hearing test is of no use or importance in the critical listening of music.
"

You missed the point totally. Mr. Fulton suggested that that woman couldn't hear over 5 KHz. or a watch ticking, if you put it to her ear. She would FLUNK any hearing test Streetwise. But she could detect instantly ( through resultants in the midrange ) when something was wrong, when 42 kHz and 80-110 KHz were taken out of the play-back chain !!


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" Also very interested in hearing about your amp when you do get it ready Im curious what your opinion is about the 2a3 vs other SET desigins, just wondering whats taking so long on the build.
Thanks "


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You are asking me TWO questions in one sentence.... on an amp build.

One question seems to be a " 2A3" versus any other tube types, on our ALTEC speakers, of course.

A second question seems to be about basic SET designs and topologies.


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I will comment on both:

On tubes, I find the 2A3 as a Finals tube to be a great overall choice. It puts out a solid 3 Watts, and it can be had reasonably in the form of a JJ 2A3-40, which IMHO, is the best overall choice one can make in the 2A3 family, on a cost versus performance basis.

A runner up tube choice for Finals, would possibly be the Type 46, from a limited ( one month ) experience with the tube..only 1.3 Watts. I prefer the Type 46, to my 2015 and 2016 Type 45 builds, by a wide margin, and I would only build with either of the two tubes I mentioned, the overall preference.... to the JJ 2A3-40.

On tube amps for ALTEC speakers, there is only one topology that I feel and hear is in-the-running. Two stage, SET, Direct-Coupled, with a LSES ( low stored energy supply ) to power it. No negative feedback what-so-ever. The driver stage will be high mu, high impedance, and have Shunt B+ regulation. See my post on this Forum, referring folks to the two Italians, Marzio and Jelasi, and their Sound Practices tube amp article, as a background read.

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I have just gotten my DIY and month-old Type 46 amp going fairly well. Only one or two little bugs to work out.

The two new monaural JJ 2A3-40 amps are next to build - probably over the next 60 days. Then I am done. Heyboer Transformers is presently building power transformers to my spec, and a local steel company is plasma cutting and will brake 14 gauge steel, for those two mono chassis. This DC SE monaural amp pair will be " IT " for me, FOR A LONG LONG TIME, AFAICT.


Jeff ......Low Ohms