I have an old CCDB mixing desk with all but two pots seized the same way as yours. 180+ potentiometers to replace. Gorgeous! (And expensive...)

One tech once told me to heat the metal casing of the pot with a soldering iron for a few seconds while trying to rotate the shaft. According to him it can save a lot of pots, but haven't tried it yet. Has to do with dried lubricants.

Tubes suck!

Quote from: joecool85 on January 31, 2011, 02:15:10 PM
So you're new to electronics and want to start building your own effects, amplifiers, guitars or repairing your old gear...where do you start?

Here of course!

If you don't have much prior electronics experience, I recommend reading this before you get too into things: http://sound.westhost.com/beginners.htm

If you do know basic electronics (how capacitors, resistors and diodes work at least), I recommend getting your feet wet with a basic project like RunoffGroove.com's Little Gem.  It is a 1/2w amp that runs on a 9v battery.  It's simple to put together and also makes an excellent "pocket amp."  I built one into a small clip-on radio that I got for $1 USD - now I can rock all around the house!

After you feel comfortable with that if you want to pursue a "real" amp I would highly recommend building a chip amp kit.  These are offered from several places, are easy to build, are normally very well designed and aren't too expensive either.

MusicPCB.com offers a TDA7240A kit called the Tiny Giant (20watts RMS) that includes a built-in preamp so you can run your guitar straight into it.  For $18 this is the best deal I've ever seen for a quality kit like this.

Chipamp.com offers LM1875 (20watts RMS) and LM3886 (50wRMS) stereo and dual mono kits.  Stereo kits have two amplifier boards that share a single power supply board.  Dual mono kits have two amplifier boards and two power supply boards, this allows you to build two separate amps if you so choose.

Rod Elliot's site is on a new location:

http://sound.whsites.net/beginners.htm

Tubes suck!

Quote from: J M Fahey on September 22, 2015, 05:18:02 PM
IF what you need is Imperial (fractional inch) drill size to mm or American #(number)  to mm, no need for that exact PDF, Google is your friend.

Well, anyway, there are a lot o pinned topics with dead links. I think it's past time for the spring clean

Tubes suck!

Quote from: lurkalot on November 03, 2012, 05:51:16 AM

Quote from: Roly on November 03, 2012, 01:59:33 AM
Thanks @lurkalot, new link;

http://utwired.engr.utexas.edu/rgd1/index.cfm

Note: this is Flash-based

Thanks. 

The new link is also dead.

Tubes suck!

Quote from: Enzo on May 02, 2018, 01:02:58 PM
The huge gain problem is less a design flaw than it is people trying to improve the amp.  In that 5000 series of amps, you might see 1458 op amp.  I recommend getting exactly that to replace them.  people "upgrade" to 4558, 4560. 4580, and then their amps become unstable at gain.

Stick with the 1458 there.

1458 is a dual 741. Appaling specs. That's why it works so well with high gain guitar settings. But if you want your amp cleaner, you'd have to upgrade them to 4558s or better, and work on the compensation caps and feedback.

Tubes suck!

i know this is a paleolitic thread but I really want to see the results and other mods you made. Frugalguitarrist.com is offline.

Do you have that somewhere else, eight years later? Thank you.

Tubes suck!


EDITED: corrected some typos. Android sucks.

Quote from: spud on May 25, 2012, 10:32:55 AM
Thanks for a really good list - some I'd seen before but many I hadn't. 

A few other books that are getting a lot of mention on the tube amp sites are the series (well 2 so far) by Merlin Blencowe:

http://www.freewebs.com/valvewizard/

Apparently several of the articles on his website are early versions of chapters in his books so you can check out what his books are about and how he writes - to me, very clearly - for free.  Just thought I'd mention it as you had several books from some of the tube amp "big guns" and Merlin's books are pretty and really great too.

Jim

Just a little update on this jurassic thread, but Valvewizard's site is in a a different domain now:

http://www.valvewizard.co.uk

The mentioned books are on the home page.

Tubes suck!

photobucket screwed your post

No hope with the Wayback Machine.
It saved the 404 page, only

I asked for the PDF on Syndromet site again. Let see if that work.

If anyone has this doc, It would be immensely appreciated here.

Did anyone try the Wayback Machine?


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