Search found 233 matches

by Jackie Treehorn
Wed Jun 18, 2014 4:59 pm
Forum: Trainwreck Discussion
Topic: rocket with tremolo circuit?
Replies: 69
Views: 18713

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...
by Jackie Treehorn
Wed Jun 18, 2014 4:28 pm
Forum: Trainwreck Discussion
Topic: rocket with tremolo circuit?
Replies: 69
Views: 18713

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...
by Jackie Treehorn
Tue Jun 17, 2014 5:10 pm
Forum: Trainwreck Discussion
Topic: rocket with tremolo circuit?
Replies: 69
Views: 18713

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 ...
by Jackie Treehorn
Tue Jun 17, 2014 1:02 pm
Forum: Trainwreck Discussion
Topic: Grey Bell Stancor A-3801 clone by Mercury Magnetics
Replies: 105
Views: 29061

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...
by Jackie Treehorn
Tue Jun 10, 2014 3:55 am
Forum: Trainwreck Discussion
Topic: Express sounds better with25 watt Celestions
Replies: 7
Views: 1059

Re: Express sounds better with25 watt Celestions

With the exception of the vox/alnico combination, I would say every amp sounds better through greenbacks.
by Jackie Treehorn
Wed May 07, 2014 4:41 pm
Forum: Trainwreck Discussion
Topic: Express Output Waveform Shots
Replies: 205
Views: 40824

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...
by Jackie Treehorn
Thu May 01, 2014 4:19 pm
Forum: Trainwreck Discussion
Topic: Guitar Volume Control Improvements for High Gain Wrecks
Replies: 19
Views: 2990

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...
by Jackie Treehorn
Sun Apr 13, 2014 6:24 pm
Forum: Trainwreck Discussion
Topic: Express Capacitor Choice
Replies: 14
Views: 4535

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!
by Jackie Treehorn
Sun Apr 13, 2014 6:17 pm
Forum: Trainwreck Discussion
Topic: Express Output Waveform Shots
Replies: 205
Views: 40824

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...
by Jackie Treehorn
Sat Apr 12, 2014 12:28 pm
Forum: Trainwreck Discussion
Topic: Express Capacitor Choice
Replies: 14
Views: 4535

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.
by Jackie Treehorn
Tue Apr 08, 2014 10:02 pm
Forum: Trainwreck Discussion
Topic: No Chokes in Wrecks
Replies: 14
Views: 2870

Re: No Chokes in Wrecks

There's a lot of similarity to the Ampeg Gemini 1's power supply. Those are very underrated amps.
by Jackie Treehorn
Tue Apr 08, 2014 4:29 pm
Forum: Trainwreck Discussion
Topic: Express Capacitor Choice
Replies: 14
Views: 4535

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 ...
by Jackie Treehorn
Thu Mar 06, 2014 10:03 pm
Forum: Trainwreck Discussion
Topic: Trainwreck Express Build
Replies: 131
Views: 15527

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, ...
by Jackie Treehorn
Thu Mar 06, 2014 9:46 pm
Forum: Trainwreck Discussion
Topic: Trainwreck Express Build
Replies: 131
Views: 15527

Re: Trainwreck Express Build

M Fowler wrote:The way the input jack is wired doesn't seem right to me?
Yes, doesn't look right to me, either...
by Jackie Treehorn
Mon Mar 03, 2014 5:20 pm
Forum: Trainwreck Discussion
Topic: Opinions welome! Various OTs for the Express
Replies: 54
Views: 9051

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 ...