Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Jack_Hester on February 08, 2014, 03:39:11 pm
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I'm regressing a bit here. This was the last drawing that I worked on, before Tubenit inspired the last version. This one is modeled from my Ampeg B-12-XY, of which I love the Vibrato sound. However, it uses Compactrons. And, I decided to make a layout of one channel with tubes more readily available. I don't particularly care for the 'Echo' on the Ampeg, so for now I'm leaving an Echo off.
This drawing is in no way complete. I haven't finished thinking about about it. It's just doable, in it's present form. But, the possibility of building a breadboard (thanks, Silvergun, for that) may make at least proving it out a possibility. I haven't ruled out a second channel. Nor have I ruled out Echo. I do plan to add an FX loop.
I am thinking of doing something different with V5, as I don't know how available those tubes are, new. I have several, but again, I'm wanting to use those that are off-the-shelf available.
Anyway, this drawing floated to the top, today. Shop was too cold (30's F) to work in, though I did get an old Swan radio on the limiter. So, the day wasn't a complete failure. Give a look, and please comment. Have a good one.
Jack
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Did a lot of thinking between the last revision and this. So, bear with me. This is probably way too big to be practical. I put everything that I would like about an amp. I put two channels, and thought about Tubenit and Silvergun's discussion (don't remember which thread) of volume changes between switching the OD in and out. So, I made a separate OD channel, and put the switch at the input. Set the levels/tones of each and switch between.
As I stated previously, I really like the Vibrato. In this revision, I added a reverb, though I'm not through with it. Just wanted to get it on the drawing. Also, when I did a tube count, I decided for grins to double up on the rectifiers. If this is in fact necessary, a SS rectifier may be more practical. But, drawing only costs time. So, in with the tube rectifiers.
I decided to just plot the whole drawing, rather than break it down to several sheets. For now, please zoom in to view. The resolution is high, so you will note component labels to be in error, as I did a whole lot of copy and paste to put it together. When, I'm at a point where things look right, I'll do a proper count and fix them.
Please give a look and comment as to improvements, or fixes, or just what you think (be easy, please). I'm stopping here, for now, as it's been a long afternoon of drawing. Small changes will come throughout the week, in between other projects.
I found a second panel in my shop that will make a good base for a bit smaller breadboard, than the one that I am planning. I may build a second one, along with the first.
The Swan tube radio is ready to move into the house, and displace the long broken Icom SS radio. That may not finished before next weekend. This will be my first time using a tube transceiver.
I'm leaving rev-A in, for now, so that you can see how simple it all started.
So, enjoy and have a good one.
11Feb14 - Note: See below for the corrected rev-B.
Jack
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No change in revision, but have corrected the component labels.
Made some minor fixes with line jumpers.
Took out the pot on the front end of the Echo circuit.
Also, plotted individual sections for larger viewing, along with the full drawing for an overall reference.
Next, I'll give the drawing a closer look to see if everything is in it's place, for a build. That's when I'll plan my layout.
Jack