Fender Bassman 100 (Silver Face) Service

On the bench ready to be opened up! (I never power up a tube amp until I have ssen inside!On the bench ready to be opened up! (I never power up a tube amp until I have ssen inside!DSC_7531DSC_7533DSC_7532Rear ponel needs some of the covering glueingsRear ponel needs some of the covering glueingsTransformers look like they have got hot at sometimeTransformers look like they have got hot at sometimeOriginal smoothing capsOriginal smoothing capsDSC_7535Interesting curvy board!Interesting curvy board!All looks originalAll looks original Hum adjuster on filament supplyHum adjuster on filament supplyDSC_7549DSC_7548DSC_7544DSC_7545DSC_7550DSC_7551One 470R screen resistor has been replaced, others are way off on value!One 470R screen resistor has been replaced, others are way off on value!Bias potBias potDSC_7540Bias pot as was just before a simple mod to help get the best from the 6L6GCBias 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 operationNew bias pot added so I can adjust bias and bias balance! essential IMHO for good tube operationClose up Bias controlClose up Bias controlDSC_7560Original tube placement instruction still intactOriginal tube placement instruction still intactCase getting a cleanCase getting a cleanDSC_7564New caps all ready to go!New 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?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!New caps installed!Now under the cap nice and safe!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)Bias caps installed and lined up a bit nicer that the old ones (my OCD coming out a little)2 Decoupling caps replaced2 Decoupling caps replacedAll the old caps, several showed signs of being close to popping!All 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 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!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!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 wiringTidied the wiring, power supply wires now grouped and kept away from signal wiringCable ties used to tidy up the wiring a littleCable ties used to tidy up the wiring a littleFinal clean up before reassemblyFinal clean up before reassemblyDSC_7588DSC_7589DSC_7590Bacj together and another test! still sounding sweet and ready someone to buy!Bacj together and another test! still sounding sweet and ready someone to buy!Rear panel cleaned covering re-glued and put back on!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!

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