hi sorry for the late reply but i have been waiting anxiously until the low hum/noise came back before i could test your suggestions, well the low hum/noise came back today whilst i was playing which game me the chance to try your methods.
my results are as follows:
Q: Does it still hum with the FX loop HARD BYPASSED?
A: yes and when switched to hard bypass makes is horrible hiss which is very prominent (i have nothing in the loop and FX is switch to off when i tried)
Q: Remove the 5U4GB rectifier tubes from the amp.. Does it still hum?
A: yes even with all channels switched to diode and with the 5u4gbs removed it still makes the hum/noise coming out of standby.
i also tried a few tings a tech asked:
raised both vol main output and master - hum/noise does not increase
hum/noise goes away on standby.
tested switching to recto from diode - hum/noise still present
tested switching to 50w and 100w - hum/noise still present
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the only change that has drastically reduced the hum/noise was changing the 12ax7's as stated in my OG post it went from really bad when it came thru the custom set, then when i changed to stock mesa it reduced the hum.
Its weird cause the hum/noise it cuts in and out?
im all out of ideas any help would be greatly appriciated. i spoke to a tech and hes ordering me all new tubes in the next month or so when he gets stocked so maybe that might help? but any other ideas and or suggestions im all ears. thanks let me know
