Post by guitarmaestro on Nov 21, 2005 7:44:33 GMT -5
Hi Jerry!
At the time I am quite convinced that something is wrong with my 5150....simply does not sound as good as it used to. After trying different guitars, different preamp and power amp tubes and checking all of the amps internal connections I made an interesting observation today. No matter what tubes i put in the power section the middle pair of tubes always flashes blue at the base of the tube when hitting heavy chords, etc. at higher volumes (pre gain of 2-3 in the lead channel). The outer two tubes dont do that.
In my expierience with other amps this blue flashing usually occurs with old tubes and tubes which are pushed quite hard (at high volumes this is quite common). As this happens with my 5150 at moderate volumes already and no matter which (matched!) set of tubes I put I suspect theres something wrong in the power section. Especially because it happens with the middle pair WAY earlier and WAY brighter then the outer set of tubes.
Any ideas what could be causing that? I dont want to take out the power amp circuit board if it is not neccessary, because this seems to require removing all 4 tube sockets from the board....
Or is this common with 5150's anway?
Thanks in advance,
Marcel!
P.s.: The new unchained sound clip made with your modded 5150 sounds awesome....I never heard that VH tone nailed better....sometime I might have to ship my amp over the ocean....
At the time I am quite convinced that something is wrong with my 5150....simply does not sound as good as it used to. After trying different guitars, different preamp and power amp tubes and checking all of the amps internal connections I made an interesting observation today. No matter what tubes i put in the power section the middle pair of tubes always flashes blue at the base of the tube when hitting heavy chords, etc. at higher volumes (pre gain of 2-3 in the lead channel). The outer two tubes dont do that.
In my expierience with other amps this blue flashing usually occurs with old tubes and tubes which are pushed quite hard (at high volumes this is quite common). As this happens with my 5150 at moderate volumes already and no matter which (matched!) set of tubes I put I suspect theres something wrong in the power section. Especially because it happens with the middle pair WAY earlier and WAY brighter then the outer set of tubes.
Any ideas what could be causing that? I dont want to take out the power amp circuit board if it is not neccessary, because this seems to require removing all 4 tube sockets from the board....
Or is this common with 5150's anway?
Thanks in advance,
Marcel!
P.s.: The new unchained sound clip made with your modded 5150 sounds awesome....I never heard that VH tone nailed better....sometime I might have to ship my amp over the ocean....
