EASYVIBE and hiss (TL062??)

[richon]

Hi,

builded to EASYVIBEs and tested them with different OPAMPS....  sure the TL062 sounds "better" for vintage sound... although in both vibes I hear some hiss...

sure it must come from thos TL062 as they are current friendly but not so hiss friendly

is there a way to tame the hiss on them....  instead of trying TL072 or TL082??

would JRC4558 be a good replacement for the "same" sound of TL062 without the hissing part?

[petemoore]

  Stick something else in if belief in hiss from opamps is to be verified, or suspect other causes.
  TL062 is the 'right' opamp unless you can get a higher current device to 'just sit quietly' in there, higher current = more current 'spiking' [the LFO tends to make currents rise and fall fast/hard enough to make a 'lump' or 'throb' in the power supply voltage that creates an audible LFO pulse when you're not playing.
  Does it hiss with a battery power supply ? [I got mine out recently and did some mods to it, playing it a lot recently, ~no real hiss in it.
 

[richon]

well...  i've build one with the "all known pcb" and with a reconfiguration/rebuild of mine...

both exibit the same hiss...  although is not even present when playing...  at room volume, with a silent house I can hear it...   I know... my rig is kinda trebly (Blackface vibroverb clone) and it shows a lot o detail in the upper frecuencys...

so, a TL072 in some stages reduced some of it... but as I was aware  a minor "poping" of the LFO appeared.

When trying a 4558 in first stage it got less hisser....  (and no poping lfo)... so I guess I should keep on testing all  OPAMPs available... right?

PS: I moved all the cables (lead dress) , tryied even outside the box with lots of space beetwen everything, on a shielded box...  Its coming from the "PCB" (95% sure)

[richon]

anyone? 

[DDD]

TL061/2/4 are too much hissy (as per my own experience). They are nuch more hissy than TL072, etc.
LM4250 hisses several times (!) less and is very "battery friendly", but AFAIK there are no two LM4250 Op Amps in a single DIP.