With a properly serviced amp; upgrading tubes, speakers and other components can improve tone quality. There are also preferred circuits that can be referenced to "back date" your amplifier and popular non-factory circuit changes to customize the function and tone of your amplifier.
Previous changes can be re-done to return your amp to stock.
Good candidates for upgrades include:
- Marshall -Most tube amps, current and vintage
- Vintage Fender
- Fender Hot Rod Series, Blues series and re-issues
- Mesa bias control
The controls of a fully buffered effects loop built for a Twin Reverb.