Metropoulos Forum

I've a 50w metroamp , everything works perfect and sound ok.
But when bridging the two channels and to increase the volume the ampli shout(iiiiiiiiiiiii) alone,
I have the cables from the jacks to the 68 resistors as short as posible
what is happening?
thanks in advance.

https://dl.dropboxusercontent.com/u/297 ... troamp.JPG

beni_fervellas wrote:I've a 50w metroamp , everything works perfect and sound ok.
But when bridging the two channels and to increase the volume the ampli shout(iiiiiiiiiiiii) alone,
I have the cables from the jacks to the 68 resistors as short as posible
what is happening?
thanks in advance.

https://dl.dropboxusercontent.com/u/297 ... troamp.JPG

Sorry, and I appreciate English is not your first language, but you will need to be clearer and use more appropriate English words as it does not make sense with what you have written. The pics look fine at first inspection.

neikeel wrote:

beni_fervellas wrote:I've a 50w metroamp , everything works perfect and sound ok.
But when bridging the two channels and to increase the volume the ampli shout(iiiiiiiiiiiii) alone,
I have the cables from the jacks to the 68 resistors as short as posible
what is happening?
thanks in advance.

https://dl.dropboxusercontent.com/u/297 ... troamp.JPG

Sorry, and I appreciate English is not your first language, but you will need to be clearer and use more appropriate English words as it does not make sense with what you have written. The pics look fine at first inspection.

Sorry for my english.
The amp sound ok. But when i plug the jump Chanel I with Chanel II. To increase the volume the amp screams "piiiiii" and I have to turn the volume down .
as if V1 microphonics much to increase the volumen.

Is your jumper cable shielded?
It's possible you used a short speaker cable instead?

So, if you plug into each input individually each one works normally with normal response?

Then if you plug guitar into Hi bright and jumper lo bright to hi normal you get a squeal, not hum or buzz?

A duff lead would be my first guess too, or faulty switching jack?

neikeel wrote:So, if you plug into each input individually each one works normally with normal response?

Then if you plug guitar into Hi bright and jumper lo bright to hi normal you get a squeal, not hum or buzz?

A duff lead would be my first guess too, or faulty switching jack?

I try with 2 guitar cable And the squeal is the same. seems V1 microponics but i try two v1 tubes.(tungsol)

Suggest recheck the jack wiring and the grounds first.

How long have you had the amp running?

neikeel wrote:Suggest recheck the jack wiring and the grounds first.

How long have you had the amp running?

I check the wiring 2 times. It has the problem since new( 3 month).