Beauty in a Vacuum: Tube pics and close-ups

paulbottlehead

Active Member
Yes. It's the second of three that I've made over the years. I'm currently working on it's much larger brother that will use the 100TH.
 

paulbottlehead

Active Member
I don't want to thread-jack too much, but since you started the thread I guess I won't feel quite as badly about it. The first one I built about nine years ago, and the original post can be found here:

https://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=158660

I ran into a schematic the year before that provided a convincing demonstration of directly coupling a cathode follower to a power-grid triode's grid to provide the low impedance drive required to make all of this work. I ended up modifying the original design a bit, adjusting the overall feedback and output transformer specs, as well as optimizing the loading of the first amplification stage with a CCS.

The second two amps were built much more recently, as I missed the sound of that original amp and wanted to fix the bugs that I had with the first one. I ended up building a pair, with one going to a good friend, and the other one not leaving my possession any time in the near future. I actually just ordered parts for a third, since I'm messing around with an active 2-way crossover.

I don't see any rules here for manufacturers or industry professionals, but I will mention that these are not Bottlehead products and certainly won't end up that way. 3C24 Twins.jpg
 

Fran604g

Just Call Me Junior
I don't generally like to recycle old pictures, but I just can't seem to take a better one than this one from about 10 years ago, or so. My TAD-60 with the quad of SED "Winged C" 6550-C's that it came with when I bought it in 2007.
100_2275.JPG
 

Fran604g

Just Call Me Junior
Those SED 6550s were great tubes! I can remember replacing many Chinese KT88s and 6550s in the 90s with the rock solid SED.
I really liked them. I was heartbroken to find them not being produced when it came time to replace them. I had tried JJE34Ls (had pin problems), 6CA7EHs (Paul Grzybek's specified original tubes - they were "okay", imo), JJ/Tesla KT-77's (garbage right out of the box), and finally found Tung-Sol 6550's (current production) which I enjoy immensely. So much so that I'm on my second quad from Upscale. :)

Okay, sorry for my thread pirating, back to our regularly scheduled program... ;)
 

je2a3

Senior Member

6F8G


Globe 56 + thoriated VT25
 
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