I like the mids and highs of the interstage, but the (fuller) bass sounds a little soft.
Thank you for your comment.
This was for the quick testing only. Actually I inserted the interstages but did not change anything in the existing circuit and 6N1P-E driver.
I am planning to build a new pse amp in a bigger box with interstages and 6S45P (Analog of WE437) driver tubes. This small tube has very high mutual conductance 45mA/V and hi gain:45. Very linear and powerful (8W plate dissipation) too. In my opinion this revision will increase the sound quality.
Jamos are good sounding for $1000 speaker but it’s sensitivity is not high. I connected my 2*3,5W amp to Tannoy 94db and listened. Sound was more dynamic, open, silky and very loud. Difference was like the night and day 🙂
Sure, the Jamos have "only" 90dB/W/m. But on my EL84PP they play pretty loud and very nicely.
Oh, I certainly posted it already 😏... My U-300B, but with more details this time 😉 :
2000-2010 = ten years during it was tested satisfactorily as a prototype :
Then in 2010, I ended to build the pair od mono blocks definitively :
Using Hammond 1550J die-cast aluminium enclosures as chassis :
Drawing then drilling : drill press, jigsaw & GreenLee
Assembly :
Wiring & Layout :
Finished :
Still operational today, flawlessly... 😎
T
2000-2010 = ten years during it was tested satisfactorily as a prototype :
Then in 2010, I ended to build the pair od mono blocks definitively :
Using Hammond 1550J die-cast aluminium enclosures as chassis :
Drawing then drilling : drill press, jigsaw & GreenLee
Assembly :
Wiring & Layout :
Finished :
Still operational today, flawlessly... 😎
T
Beautifully build! The one thing I would have done is to build them to mirror each other, but they are fine as they are, of course. How do they sound, as ultimate 300B amp?
Someone else's DIY effort that I cleaned up and made work. Wired as a Williamson it actually sounds really good.
(Original builder is long dead, I bought them from an old hifi shop which is long since closed)
They make an honest 35 watts and sound pretty darn good doing so.
Could use some attention on the input, or perhaps more feedback.
An amp like this could be tweaked on indefinitely or just enjoyed.
I chose to enjoy it.
(Original builder is long dead, I bought them from an old hifi shop which is long since closed)
They make an honest 35 watts and sound pretty darn good doing so.
Could use some attention on the input, or perhaps more feedback.
An amp like this could be tweaked on indefinitely or just enjoyed.
I chose to enjoy it.
Thanks @Horneydude !
Well, it's more complicated to build in mirror the two blocks when the target is compactness : the connections, the posts and pinouts, the wiring layouts are different in each amp, and this may be an issue when the space is counted.
And I will be honest : it's also easier, as you do it "one time and duplicate"... 😏 😉
I called them "Ultimate 300B" because... I lagged 10 years before building them, nothing else ! Or rather because of their compactness, but not for their performance - which is correct and as expected (below), but the output transformer, while good, is not an "ultimate" one...
I'd say that my U-300B have the sound of a good 300B, but nothing exceptional, or "Ultimate", due to the output transformer.
T