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was just doing a quick comparison of my 2 bandmasters today and the 76 master volume one seems a bit poorly. i've not used it in a while but this is what i'm hearing.
there is some low pitched crackle coming through which i think went away when the reverb was turned right off. the other thing was the bass frequency just dropped out as i was playing, i flicked the stanby on and off and it came back but then went away again. i only had time to try different valves in v1 and v2 but nothing changed. i'm hoping it is only gonna be valve related.
a bit of amp history..... i had a new circuit board fitted a couple of years ago as the old one had become conductive but alot of the original components were put back on. its been blackfaced. just thinking about it, the last time the amp was properly used it blew a output valve (one of those philips 6l6wgb's mentioned in another dicussion) i had a new set of svetlanas put in and haven't really used it since. that low pitched crackle/rumble is a very similar noise it was making when the circuit board went conductive. (it can't be that though as the new board is a different type to the old)
any ideas folks
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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I don't think any of the resistors were changed as I took it to the amp tech and just asked him to rebias the amp with the new tubes in it. It didn't blow a fuse when the valve died. Shall I post some internal pics to shed some more light on it.
after another quick test, the noise from the reverb seems to be a seperate thing from the crackle. reverb noise is a bit like holding a shell to your ear and gets louder as the reverb is turned up and goes when turn right down. the crackling sound is very intermitent and happens with no instrument plugged in, as does the reverb noise. i'm gonna take it apart a get some pics to put up.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
not sure which are the screen resistors. the ones between 4&8 and 5&3 all appear to be intact as do the ones that come from 7 and go to ground. does seem to be a good few components that look like they need replacing ie some of those ceramic disc caps.
http://i1231.photobucket.com/albums/ee512/bandmaster188/image_zps799f2fb8.jpg http://i1231.photobucket.com/albums/ee512/bandmaster188/image_zpse0a1aa3a.jpg http://i1231.photobucket.com/albums/ee512/bandmaster188/image_zps43461334.jpg http://i1231.photobucket.com/albums/ee512/bandmaster188/image_zps1f761b39.jpg http://i1231.photobucket.com/albums/ee512/bandmaster188/image_zpsea3b86d1.jpg
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
cheers icbm. i think i will have to get it sorted out by a pro really. i've just been experimenting with some other 6l6's incase one of the svets was faulty. i came across the philips 6l6wgb's which i'd kept for some reason(probably cause they were expensive and i couldn't bare to bin them) and put them in. it appears that they are both working fine. i'm pretty sure that at a rehearsal when the amp was playing up that one of them was not lit up or warm so i just assumed it was blown???
the crackling noise is still there though with different power tubes in place.
now to try and find an amp tech in the south east as my one has gone awol. i don't suppose you'd be swinging by biggin hill any time soon.
[-O<"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein