tristanc wrote: ↑Tue May 12, 2020 5:39 pm
I have a small FIreFly-style build that sounds great but rarely gets used - my plan is to pair it with a spare 12" speaker I had and box it up to make a little combo. A very high gain tweed combo.
Will probably start a build thread. I bought a ready-made cabinet from Juke Tone as I don't have the carpentry skills. There are a few bodges and alterations to be done. And I might lacquer it as well.
The main issue is the chassis is much smaller than the Blue Jr cabinet takes, so mounting will be an issue. Also the OT is going to be very close to the speaker magnet - I think I'll get away with it.
It fit with about 1cm to spare. Sounds and looks great. And I still need to make a faceplate to cover the gap... I'm looking to change the self-split output stage to a proper push-pull one by adding a solid state cathodyne phase splitter. Will give a bit more clean volume and make the amp a bit louder should that be needed.
A superb little amp to move around the house as needed. Loved playing by the patio doors when the weather is good.
In the photos you can see the aluminium angle I used to attach the chassis by a couple of bolts. I wasn't too keen on the corner protectors but the tweed wasn't too tidy underneath so on they went.
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I always wanted a Ric 4001. By the time I could afford one, the QC issues and bridge gave me pause. So I decided I had time to make one.
I broke the bridge P/U ring, so I have to make another, if I can find that piece of ebony. My shop reorganization is hindering progress.
My first binding attempt.
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Tube junkie that aspires to become a tri-state bidirectional buss driver.
I moved in with my oldest son, waiting for my new home to be built. Started the new home thing before all this Covid-19 stuff. All my stuff is in storage until October.
I bought a chassis from Ryan Colagen SSS 002 old style build and have been collecting parts for that but I'll wait until I get moved to new home to get my stash of caps and resistors.
I then bought 3 more SSS off of Reverb (chris) and stocking up for 2021 builds.
I finally dug into this derelict H.H. Scott Model 272 integrated amp that came from a vintage gear hoarder's estate and got it working. I have had this thing sitting around for so long that Martin Manning tested the tubes for me when his u-Tracer still had that new car smell.
(The fact that this thing looks like a goat ate the entire contents of a Radio Shack and then vomited into a metal tray should not in any way be blamed on me. This is how they made them. So much for "lead dress.")
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Scott 272 after.jpg
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Fantastic! What did you do to it, and how does it sound?
BTW, the small signal tubes (Telefunken, IIRC) are a little better than I reported since I learned later that the uTracer as originally designed didn't do too well setting low bias voltages.
I redid the whole power and bias supply circuits (one new cap can with double the stock values, the other five “restuffed” with stock value radial electrolytics; silicon bridge rectifier in place of the selenium one; new resistors all around), replaced the one power tube socket that had previously been replaced and had arc marks, replaced the four non-original, non-matching coupling caps someone had previously put in, replaced the bias and AC balance pots, added screen protection resistors and individual cathode sense resistors with tip jacks. Using a mixture of some of the original tubes and some new ones.
I don’t have anything tube-powered to compare it to, but it sounds pretty good to me, at least in the garage. I was really expecting that it would have additional things wrong with it, or that it might not work at all or go up in flames, but aside from some initially scratchy pots and crusty switches, it seems to be fine.
