Search found 233 matches
- Wed Jun 18, 2014 4:59 pm
- Forum: Trainwreck Discussion
- Topic: rocket with tremolo circuit?
- Replies: 69
- Views: 19341
Re: rocket with tremolo circuit?
Wait! You're right, the footswitch should be connected to the turret next to it and the turret with the footswitch now, should just be ground. Sorry, folks! [img:2304:1728]http://theinside.net/FLR/r8.JPG[/img] If you look at it, there, the black wire goes to the footswitch and the blue wire is groun...
- Wed Jun 18, 2014 4:28 pm
- Forum: Trainwreck Discussion
- Topic: rocket with tremolo circuit?
- Replies: 69
- Views: 19341
Re: rocket with tremolo circuit?
The layout works. The particular amp I based it on was one of the Thomas Organ voxes, the 2 el84 one, which I thought had an outstanding tremolo. I think that amp was on Ken's list of top 10 sleeper amps. Usually with modulating a preamp tube, you see another triode as a cathode follower for impedan...
- Tue Jun 17, 2014 5:10 pm
- Forum: Trainwreck Discussion
- Topic: rocket with tremolo circuit?
- Replies: 69
- Views: 19341
Re: rocket with tremolo circuit?
Great thread, but I'd be grateful if someone could explain how it works in a Rocket. I see that it's an LFO, and in the 6G3 Deluxe, and other apps, it's used with a fixed (adjustable) bias setup. I can't wrap my head around how it works in the cathode biased amp, with the LFO hooked to a spot that ...
- Tue Jun 17, 2014 1:02 pm
- Forum: Trainwreck Discussion
- Topic: Grey Bell Stancor A-3801 clone by Mercury Magnetics
- Replies: 105
- Views: 29593
Re: Grey Bell Stancor A-3801 clone by Mercury Magnetics
rj do you really believe the Rocket used 500vct PT and 5k OT? You know I have no knowledge either way just wondering. :) Mark, for me the reality of studying Trainwrecks is that it can be a deceivers game and occasionally I find I have misinterpreted the facts and on other occasions I find I'm in p...
- Tue Jun 10, 2014 3:55 am
- Forum: Trainwreck Discussion
- Topic: Express sounds better with25 watt Celestions
- Replies: 7
- Views: 1104
Re: Express sounds better with25 watt Celestions
With the exception of the vox/alnico combination, I would say every amp sounds better through greenbacks.
- Wed May 07, 2014 4:41 pm
- Forum: Trainwreck Discussion
- Topic: Express Output Waveform Shots
- Replies: 205
- Views: 41736
Re: Express Output Waveform Shots
Just wanted to chime in and express some gratitude to those who have contributed. It's a very dense thread and I haven't kept up very well, but wanted to add some encouragement. I think with the grid conduction terminology we were just describing the initial clip. One of my ongoing projects has been...
- Thu May 01, 2014 4:19 pm
- Forum: Trainwreck Discussion
- Topic: Guitar Volume Control Improvements for High Gain Wrecks
- Replies: 19
- Views: 3105
Re: Guitar Volume Control Improvements for High Gain Wrecks
It's the cable capacitance causing the roll off. If you can keep the capacitance of the cables and true bypass pedals down, you probably can get by without any mods. On a sort of similar note, guitar mods, any of you experimented with dummy coils with your single coil guitars? I've got a really nois...
- Sun Apr 13, 2014 6:24 pm
- Forum: Trainwreck Discussion
- Topic: Express Capacitor Choice
- Replies: 14
- Views: 4606
Re: Express Capacitor Choice
Yes, that's a good one. I tend to think of that as unintentional coupling. Something to keep in mind though, that positive feedback coupling is to be avoided most of the time!
- Sun Apr 13, 2014 6:17 pm
- Forum: Trainwreck Discussion
- Topic: Express Output Waveform Shots
- Replies: 205
- Views: 41736
Re: Express Output Waveform Shots
Hey, welcome back. Nice to see this thread again, too. I'm going to have to sit down with a cup of coffee and go through it again. Regarding your latest traces, did you change the bias when you swapped tubes? It looks like the 6V6's are breaking up earlier, which would lead me to believe there's les...
- Sat Apr 12, 2014 12:28 pm
- Forum: Trainwreck Discussion
- Topic: Express Capacitor Choice
- Replies: 14
- Views: 4606
Re: Express Capacitor Choice
Yes, that's it exactly. The distance between the wires (closer is more) and the amount of area that they're parallel determine the amount of capacitance between them. There is a formula here, http://en.wikipedia.org/wiki/Capacitance, but you can measure, too. There's not a ton to work with, of course.
- Tue Apr 08, 2014 10:02 pm
- Forum: Trainwreck Discussion
- Topic: No Chokes in Wrecks
- Replies: 14
- Views: 2942
Re: No Chokes in Wrecks
There's a lot of similarity to the Ampeg Gemini 1's power supply. Those are very underrated amps.
- Tue Apr 08, 2014 4:29 pm
- Forum: Trainwreck Discussion
- Topic: Express Capacitor Choice
- Replies: 14
- Views: 4606
Re: Express Capacitor Choice
The 716P is my general go to cap, I'm not as familiar with the 715. They need some time to burn in, they can sound a bit constricted at first, but after 10-20 hours they sound great. They're a transparent cap, so they don't screw with the sound as much as a polyester. The interesting thing, is that ...
- Thu Mar 06, 2014 10:03 pm
- Forum: Trainwreck Discussion
- Topic: Trainwreck Express Build
- Replies: 131
- Views: 16327
Re: Trainwreck Express Build
Whats not right about it? I've checked it and it works as it should, grounds the jack when nothing is plugged in. Update: 150K Grid Stopper did nothing to stop the issue. Checked again with my oscilloscope and it definitely comes from the volume pot. Yes, I guess it works. It's the 1 meg resistor, ...
- Thu Mar 06, 2014 9:46 pm
- Forum: Trainwreck Discussion
- Topic: Trainwreck Express Build
- Replies: 131
- Views: 16327
Re: Trainwreck Express Build
Yes, doesn't look right to me, either...M Fowler wrote:The way the input jack is wired doesn't seem right to me?
- Mon Mar 03, 2014 5:20 pm
- Forum: Trainwreck Discussion
- Topic: Opinions welome! Various OTs for the Express
- Replies: 54
- Views: 9315
Re: Opinions welome! Various OTs for the Express
I think Richie posted this transformer test awhile back... http://www.one-electron.com/Trans_Tests.html The Stancor has the worst bass performance. It also measures 7.6k, which I hadn't noticed before. It would be very interesting to know how consistent they are in that respect. hint hint hint!! It ...