how to tame liver pool hiss?

harris51 · Post by **harris51** » Mon Jun 11, 2012 5:45 am

even with 1meg audio taper pots in all the correct locations my liver pool has alot of air (hiss) don't get me wrong this is by far one of the best amps I;ve ever heard or played I was just wondering if it's normal to have this much air OR HISS even if the guitar isnt plugged in, is there anything I can do? Thanks

surfsup · Post by **surfsup** » Mon Jun 11, 2012 11:33 am

Does the hiss significantly jump up at a particular stage? What wattage resistors do you have for plates and gridstops/screens?

harris51 · Post by **harris51** » Mon Jun 11, 2012 3:48 pm

Im using the ceriatone layout to the tee

Reeltarded · Post by **Reeltarded** » Mon Jun 11, 2012 4:06 pm

But it's hissing at volume then, right? The hiss isn't competing with the guitar signal, is it?

harris51 · Post by **harris51** » Mon Jun 11, 2012 4:35 pm

the hiss isn't competing with the guitar when playin it when Im not the hiss is so there, maybe it's normal for this sort of amp? I dunno? I do know that if on stage the hiss would drive everybody out of the place or if your recording it wouldnt work there's gots to be something I did wrong or something I could change, in order to get the tone I have to at least go to 10 o clock then the hiss when not playin is just to loud, input jack has got a good connection. I dunno

Reeltarded · Post by **Reeltarded** » Mon Jun 11, 2012 4:44 pm

Hmm maybe it is something there... do you have a camera and a youtube channel?

It could very well be your expectation... or maybe not. What other amps have you played through?

M Fowler · Post by **M Fowler** » Mon Jun 11, 2012 5:37 pm

At idle this amp has a lot of hiss for which there is very little you can do other then run lower gain preamp tubes which takes away the character of the designed amp.

Mark

Big Jim · Post by **Big Jim** » Tue Jun 12, 2012 2:03 am

Harris,
My Express has a pretty good hiss going on. I loaned it to a band to record with, and when I went in to listen to the tracks I was quite suprised. There was zero hiss. Nada. I asked the engineer what he did to get rid of it. He said "nothing, that amp records great". They had it cranked up too. They did have the cab in an isolation booth, but I don't see how that would make any difference..... I don't know anyone thats been able to silence the hiss on a 'pool or Express at idle completely.

LarryLarry · Post by **LarryLarry** » Tue Jun 12, 2012 4:27 am

Hiss can be a good thing - when you have an amp that always hisses but sounds awesome, then it's good!

Ironically, this is 1 of the reasons I built a blond 6G6-B Bassman. I had a few back in the day (I'm old), and I always remember the hiss - and the tone!

I've been told by friends older than me, that when they saw Jimi Hendrix live his amps sounded like a waterfall when then were just sitting before he started playing (must have been off standby).

M Fowler · Post by **M Fowler** » Tue Jun 12, 2012 4:29 am

Jimmie's pedals were junk and caused ground problems as well as not working quite often and had to be switched out. Good article in recent guitar magazine about his effect pedals.

Mark

harris51 · Post by **harris51** » Tue Jun 12, 2012 4:39 am

Thanks everyone for all the help, I come to the conclusion that my amp is one hell of a tone machine,hiss and all Im just so exicited to have this baby in my arsenal this is my second build my first being a brown note 44 d-lite which I love and now this baby- can you say tone heaven? Thanks

ckpop · Post by **ckpop** » Tue Jun 12, 2012 4:46 am

Harris, When you record it's the signal to noise ratio with the correct gain structure and the hiss is not noticed. Yes standing in front of the amp it seems like alot but in the studio many pro rigs are the same hiss level.
Go forth play and record !!!!!!!!!

geetarpicker · Post by **geetarpicker** » Tue Jun 12, 2012 6:08 am

I've found with my original Trainwrecks that the noise levels are actually lower than most amps, when compared at similar gain and DB levels.

A simple way to enjoy low noise levels around the house is to use a power attenuator.

In the studio when you record the rig (which will probably be blasting at 115-120 db and seem noisy) when played back at a more typical 85-100 db listening volume the noise will just about disappear.

That said some original wrecks (my '85 Lori for example) used conductive plastic pots which may actually help to minimize the circuit noise. That amps also seems a little quieter than my '89 which uses different pots.

Reeltarded · Post by **Reeltarded** » Tue Jun 12, 2012 4:45 pm

3 wide open 4-holers create a lip reading situation at idle.

hans-jörg · Post by **hans-jörg** » Thu Jun 21, 2012 12:49 pm

geetarpicker wrote: A simple way to enjoy low noise levels around the house is to use a power attenuator.

Hi,

Glen said it!

I was disapointed about my built skills. I tried dif. wire routings and groundings. But hiss is still there. No wonder with 4xEL84.
So I tried once with the attenuator ...

From -3 db on - no hiss but pure Liverpool.
The only thing: V1 should be a quiet one.

Put in the quietst 12AX7 at Vi und use an attenuator. You aint need more.

Best

Hans-Jörg

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