On the bench ready to be opened up! (I never power up a tube amp until I have ssen inside!Rear ponel needs some of the covering glueingsTransformers look like they have got hot at sometimeOriginal smoothing capsInteresting curvy board!All looks original Hum adjuster on filament supplyOne 470R screen resistor has been replaced, others are way off on value!Bias potBias pot as was just before a simple mod to help get the best from the 6L6GCNew bias pot added so I can adjust bias and bias balance! essential IMHO for good tube operationClose up Bias controlOriginal tube placement instruction still intactCase getting a cleanNew caps all ready to go!Interesting wire to nowhere, someone else noted this on another BassMan 100, guess it was in the spec for the decoupling cap board but not actually needed so they cut it off?New caps installed!Now under the cap nice and safe!Bias caps installed and lined up a bit nicer that the old ones (my OCD coming out a little)2 Decoupling caps replacedAll the old caps, several showed signs of being close to popping!Now I am preparing to put all the 470R I watt resistors in as the values are a bit off on the current ones and also one is different (OCD issues again here)Now all the same phew!OK all powered up bias set optimally and I am hearing her for the first time! Sweet! very little hum or hiss and loads of clear volume! sound good with both Bass and Guitar!Tidied the wiring, power supply wires now grouped and kept away from signal wiringCable ties used to tidy up the wiring a littleFinal clean up before reassemblyBacj together and another test! still sounding sweet and ready someone to buy!Rear panel cleaned covering re-glued and put back on! 70s Silverface Bassman 100 head which came in needing and full service and all Electrolytics replacing. I also installed a decent bias adjustment circuit (bias balance and value). She is now sounding sweet and up for sale if you have a reasonable offer!