Marshall TSL100/122 AND DSL repair page

The Marshall TSL and DSL are great sounding amps. I haveowned a couple, but after been bitten, Imtwice shy.

$$$$$$$$$$$$$$$$$$$ and lots of $$$$$$$$$$$$$$$$$

Marshall TSD/DSL repair info

I first discovered the issues with the Marshall TSL series of amps as I owned a couple

I had a TSL122 and later a TSL100

A warning about repairing theses amps.

I don’t want to go on for pages and pages so I will keep to the basics

If you red plate or destroy power output tubes, or you clean channel has a hum that starts off quiet and gets louder as the amp gets warmer, be prepared for a mega repair bill.

These are symptoms of a defective main board, the boards that houses the power tubes and preamp tubes.

The board material breaks down and they start to track the high volts.

Bottom line prices.

I use to offer a workaround but after a recent repair I no longer offer this repair

A new main board last time my price from the Australian importer was $450

It takes about a 1.5 hour to repair

and will require a set of power tubes

So you are looking at prices starting from $830 (this usually covers it)

If you have also blown a power transformer add another $300

I know all about the mods, as I was active in the early days in the development of such mods.

Yes they can buy you time, but unfortunately the issues will arise in the clean channel, and so on.

he does a really nice mod kit, but unfortunately it does not solve the problem with the Clean channel Hum problem.

My advise is to right the amp off or except the expensive repair bill.

They are a great sounding amp, they are repairable with new boards at the moment in 2018.


TSL100/ DSL100/ TSL100 main board


Checking bias drift


Insulation test of PCB between control grid and adjacent pins showing a dramatic leakage. (a great info page)

TSL issues Sound Evolutions 2018 Ph 0438788346 Redlands Queensland Australia