Marshall TSL60 tube heater circuit

[Force3fan]

Hello all
Been having a problem with the heater fuse inside on the circuit board blowing.
It is a Marshall TSL60 about 12 years old.
This has happened twice in the past 3 months.
I posted in another area on here already.
I was hoping someone could tell me where i can get a schematic of the heater circuit.
Thank You
Force3fan

[J M Fahey]

Search for the TSL60 schematic , it should include the heater wiring.

EDIT: there you have it:
http://drtube.com/schematics/marshall/tl60-60-02.pdf
Cluttered schematic, oh well.
They feed 6.3V AC "Fil 1 / 2" to Power and PI tubes, then rectify with a Bridge and 2 10000 x 6.3V capacitors, getting "Fil A / B" for the others, but the input tube seems to be fed through a flying wire (dotted line) and has its own extra 10000 x 6.3V filter.
I´d pull the 6.3A fuse and measure AC current across the fuseholder terminals, without tubes and then inserting them one by one, until I find something unexpected.
Any AC consumption without tubes is abnormal.
Good luck.
Please post results.

[Force3fan]

Thanks for your info.
I did search and found a link to the schematic.
Am waiting to get the switch then will start testing the circuit.
It is very intermittent but a current test is the place to start.
Thanks for the information.

[Enzo]

I'd say the place to start would be to slip a different set of power tubes in there and see if it makes a difference.

My surmise is that one of the power tubes is occasionally failing with a short to heater.

[Force3fan]

Thanks for the reply.
I do have the orig. and that is the easiest thing to try.
Again Thank You.