Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: 12AX7 on December 12, 2012, 10:17:19 am
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First off, i do realize this isn't possible. But i'm looking for "as close as possible". I want to build a fender toned amp, but not the traditional fender. I want an amp that is a master volume amp to get fender overdriven tones at home volumes. In particular i want that fender sounding OD with that flutey/reedy sounding drive that SRV got. Again, i know i won't get there in a master volume amp at home volumes, but is there a schematic for an amp that will get somewhat close to that, be it a commercial amp schematic or something a member designed?
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You can take a look at the Deluxe-umble Reverb idea. With the PAB (preamp boost) and the midboost on the tone stack, you can get some VERY cool overdrive! Already has a layout for it.
(This is similar to my Tweed BluezMeister preamp and LTPI. And I like the PAB and midboost overdriven tone on the clean channel even without the OD channel engaged. The TBM however is cathode biased not fixed biased.)
http://www.el34world.com/Forum/index.php?topic=13615.0 (http://www.el34world.com/Forum/index.php?topic=13615.0)
Another option would be to build a Deluxe Reverb single channel with a "Tweed BluezMeister" OD section with it. This idea would use a blackface Deluxe (non-reverb) preamp, LTPI and power section .............. but would add reverb and the TBM OD. And it would have the TBM overdrive as switchable by relay or DPDT switch.
Just a couple ways to approach it.
With respect, Tubenit
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Does that have that reedy quality to the OD i mentioned? I should have said that hats mainly what i'm looking for, tho i'm not sure if that describes it well enough to anyone. Hard to describe other than that, but to me "reedy" seems accurate. Anyways, w/o that it would be a waste of time and money. Not even sure how possible it is in a MV low volume amp. I've never heard it in one but thats why I asked.
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It's not impossible.
Here's how I did SRV-sounds years ago:
SRV used muli-amp setups for performance and recording. No matter what he used, he sounded like him, but I duplicated some of that sound with the following setup.
I had a blackface Princeton Reverb and a tweed Princeton. I used an A/B/Y pedal to split the guitar signal to the 2 amps. I set the Princeton Reverb for a fairly clean sound at lowish volume, and probably set the Treble and Bass a little higher than I'd typically do when using it by itself; Reverb around 4 or so to add some depth. The tweed Princeton was near-cranked and used for a midrangey distorted sound to fill the mid-scoop space in the Princeton Reverb.
Overall, there was clean and distorted at the same time, mid-scoop and mid-boost at the same time, dry and reverb at the same time. Does Pride & Joy/Texas Flood pretty well. Yes, it's not the wall of doom he used in recording.
Output tube distortion is, in my opinion, important in this setup. But let's say you can get close-enough distorted sound from preamp tubes. Then you just need multiple preamp channels with different voicing/tone circuits, same phase relationship and able to be mixed to give your clean and distortion ahead of the output stage. It's very important that there's some consideration given to getting your distortion sound at the same relative volume at your clean sound, to get good control of the relative level of each without being limited to a single volume level.
You might need one master volume for the whole amp which acts the way Hiwatt intended their Master to work, meaning it sets the overall amp volume and was not intended to facilitate preamp distortion. I say that cause you'll need channel master volumes to force each channel to distort or not as desired.
You could go as crazy with the number, configuration, tone circuit, tube type, etc of channels as you'd like.