Metropoulos Forum

demonufo · Post by **demonufo** » Sun Mar 10, 2013 9:27 am

Shielding or lead dress is most likely, but since you JUST bought it, I'd be taking it up with whoever sold it. Don't want to go poking around just yet if it's going to invalidate any warranty.

Yngve · Post by **Yngve** » Mon Mar 11, 2013 9:38 am

demonufo · Post by **demonufo** » Mon Mar 11, 2013 9:45 am

Possibly. I know nothing about the Brunetti circuit so it might be something as simple as oscillation, depending on how much gain is on tap.

Is the amp under warranty?

You might just want to try different pre-amp tubes first, to rule them out as a potential problem.

alexradium · Post by **alexradium** » Sun Mar 17, 2013 3:35 pm

please contact Brunetti via email,he will answer personally to any question.
The squealing with gain and boost maxed is typical of Marshall,being handwired i can think of some wiring off place or a defective tube,but his amps are built around chinese preamp tubes...

alexradium · Post by **alexradium** » Sun Mar 17, 2013 3:36 pm

Yngve wrote:The Squealing has oh so little has stopped but as its on full boost and gain l hear when l pick attack its very shrilling and toppy sounding. Its so all weird. Would photos of the internals help?

please a little porn a day is just ok...

GENSTRIDE · Post by **GENSTRIDE** » Sat Mar 23, 2013 3:32 am

Yngve · Post by **Yngve** » Sat Mar 23, 2013 7:16 pm

GENSTRIDE · Post by **GENSTRIDE** » Sat Mar 23, 2013 7:57 pm

alexradium · Post by **alexradium** » Sun Mar 24, 2013 10:16 am

Yngve wrote:This amp came with Svetlana EL34 and TAD Russian branded preamp tubes all 12AX7

these are favored by Brunetti,he answered about this in his forum
http://www.tubeampdoctor.com/en/shop_TA ... _E83CC_391" onclick="window.open(this.href);return false;

alexradium · Post by **alexradium** » Sun Mar 24, 2013 10:36 am

http://www.brunetti.it/forum/viewtopic.php?f=19&t=3266" onclick="window.open(this.href);return false;

alexradium · Post by **alexradium** » Sun Mar 24, 2013 10:48 am

Yngve wrote:Just bought a Brunetti Mercury 100 watt Hand Wired Amp, getting some nice cleans and nice distortion but as l dial up beyond 80% gain it starts to squeal with the boost on, if off it doesn't do it. I have done a re tube and still it squeals no matter 5 guitars l have. Pretty annoying as this amp is suppose to be their top notch amp. My Bogner Ubershall Twin Jet plus VHT Ultra Lead as dead quiet. Can someone pin point what l can do to test if its either shielding, wiring or a cap problem.

If you need more detail images please let me know, its still squealing??? If any one can help to iron out the problem what a fantastic Easter it would be

i don't see any snubber cap on the plate resistors.
to me this means that with high gain settings on a Marshall style pre you get a lot of high freq oscillations.
my choice would be adding a 250/500 pF ceramic cap on the 2nd or 3rd stage plate or both,it all depends on how much highs you can remove without compromising the original tone.
I'd shoot an email to mr Brunetti before attempting any mod...

Yngve · Post by **Yngve** » Mon Apr 01, 2013 7:04 am

demonufo · Post by **demonufo** » Mon Apr 01, 2013 8:29 am

Well that's a bit shit!

Yngve · Post by **Yngve** » Mon Apr 01, 2013 8:53 am

Metropoulos Forum

!

!

Re: Brunetti Mercury 100 Watt Squeals

:)

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

:)

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

Re: Brunetti Mercury 100 Watt Squeals

:0

Re: Brunetti Mercury 100 Watt Squeals

:)