Maintenance problems in the basic TS series
The TS series as a whole has a couple of weaknesses that you should know about if you own one of them.
In the TS 808 and 9, and probably the TS10 as well, the external DC adapter connector is prone to craciking either the solder or the board where it's soldered on. This can lead to intermittent operation of the unit, as the normal battery power goes through there as well. To fix this, open the unit up and examine the power jack and board immediately around it. If you have solder cracking, ust remelting the solder with a touch of an iron and a little fresh rosin core solder will fix it right up.
If the board itself is cracked, just remelting the solder will temporarily fix it by bridging over the crack, but solder is a very poor mechanical material and it is likely to crack again through the solder. In this case, use a bit of resistor lead on the tracs, bent to shape and soldered in place for a ways back from the connector leads. It's a good idea to shape the resistor lead into a tight loop around the power connector leads for more support. Solder the resistor lead along it's entire length for 1/4" or so along the trace leading away from the connector. The resistor lead is tin/solder plated soft steel, and will mechanically support the connection.
It's not a bad idea to simply do this reinforcement in any case unless your soldering skills are not quite up to doing it without shorting out other traces.
The "bypass" switch module seems to be prone to failure and intermittency as well. This switch is a sealed keyswitch module, and inside is a dished metal dome that clicks over to make contact when the button is pressed. There is also a rubber ring inside that keeps things apart. The intermittency seems to come either from corrosion of the disk or contamination of the contact points from gook coming from the rubber part. My friend the amp tech actually takes the switch apart - if you're careful this can be non-destructive - and cleans the contacts up, getting rid of any loose debris. He claims a 70-80% success rate at doing this.
Of course, he's also sitting on a pile of replacement switches from the local electronics surplus house, too, so failures of technique are not fatal. The switches are not particularly hard to find or expensive if you have a good surplus outlet nearby. If you don't have this advantage but do have some electronics skills, you can put any one of a number of other miniature snap action ("tactile feel") switches in there if you can adapt them mechanically to the small circuit board and the activation spring from the foot treadle.
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