The Amp Garage

These were heyboers that had the stickers removed. And I've used both of them enough to know the difference. And the supplier responded that yes, they were heyboer's, and that they have had issues with shipping the wrong product lately. But the deal is, I can understand making a mistake. I make ple...

Drug store (chemist's, across the pond) H2O2 is 3%, and muriatic acid as sold for cleaning masonry is 28% HCl acording to the Gootee site. I'm picking some up today so I'll see what I can get. Edit: The muriatic acid available locally is 31.45% (10.2M)... must be some variation in the exact strength...

The boards look really good! I've decided to give the Pulsar system a try. I should have it within a week, and I'll report back with findings. The special materials aren't very expensive, especially if the results are reliable. BTW there is a note on the Pulsar site that says the laminator doesn't w...

I haven't looked it up in TUT, but it looks right. The failure is the same as when a pot becomes "noisy," so it certainly could happen. On the other hand, there are milions of amps out there that are not wired "fail-safe." Maybe one of the pros can comment on how often it happens. There are other wa...

The failure that the safety resistor is protecting against is the pot's wiper losing electrical contact with its element. If that happens, the grid voltage is on average zero, and there will be excessive current flow through the power tubes and the OT. In normal operation, the bias voltage is set by...

According to a recent interview and photo in The Fretboard Journal , that amp is ODS #002, a 50W. Controls are Vol, then the three slide switches: Bright, Deep, Guitar/Mic, T, M, B, Overdrive, Level, and the slide switch on the right is labeled "Accent." Anybody know what the accent switch does? And...

I have a 17/39 and it works fine. Also try to figure out if the hum is 60Hz or 120Hz. Two different sets of problems; two different sets of solutions. How does one determine whether it's 60Hz or 120hz? Thanks, CW Use a 'scope. If you don't have access to one of those, the A-string 2nd fret (B2) on ...

ic, what "system" are you using to do this? All-DIY? I have looked at this kit: http://www.pulsarprofx.com/ Maybe the paper sold there and the overcoating step would eliminate the fuzzy edges and touch-up you are having to do. The laminator suggested looks like a good bet for consistent results too,...

Those look like the dimensions of the Natchanis chassis. I used #124 photos and known part dimensions to get mine. Anybody get measurements from a physical unit? I'd be glad to update the drawing.

MPM

Mystery solved Re the #124 photos, then? It has NC on one side of the PAB slide switch.

MPM

You could post this request over at the Music Electronics Forum.

Check this thread there:

http://music-electronics-forum.com/show ... ine&page=2

"Capnjuan" is still on-line, and maybe he has what you're looking for.

MPM

Are you running in Excel or some other program (Open Office, e.g.)? If in Excel, did you check the security level? Tools -> Macro -> Security..., then set to Medium or lower. The latest Mac Office does not support VB macros, so if that is the problem you are out of luck using the buttons. You can al...

No problem; this is all good stuff. Yes, this is the so called "five equal voltage ordinates" method (RDH4 p. 564), and it estimates distortion at clipping (signal peak at Vg-k=0). Similar methods using more points are shown to get % distortion at higher orders. There is no reason any of these could...

Don, you are much more adventurous than I. My plan is to do an ODS with a few minor layout changes and a modernized back panel. This really needs to go into a CAD program so it can be modified as needed and handed to a fab shop when the time comes. I'll likely get to that in the next few weeks. mlp-...

Well, I drew this in Powerpoint so I don't think that will be of much additional help to you. I'm looking at getting some quotes from local fabricators once I get everything dialed in for the compopnents and mounting hardware I'm using. I'll have to put it into a real CAD program for that, but it mi...