[[email protected]]

hi,

I got a mesa/boogie mark IV head and no sound is getting out off
it.

History :
- this amp have sound lost some time ( sound volume drop )
- i change the power tube -- problem not solve


- one day, no more sound, speaker cab and cable are ok

- i can hear sound (when i play guitar) going out from the output
tube but it dont goes true speaker ????



is my power transformer may be the trouble ?

i need your advice

p.s. : sorry for my english but it's not my native language

[zack]

did you check the HT and screen supplies
if ok check for open resistors.
check the output transformer for
open circuit wineding.

wrote in message
ups.com...
hi,

I got a mesa/boogie mark IV head and no sound is getting out off
it.

History :
- this amp have sound lost some time ( sound volume drop )
- i change the power tube -- problem not solve


- one day, no more sound, speaker cab and cable are ok

- i can hear sound (when i play guitar) going out from the output
tube but it dont goes true speaker ????



is my power transformer may be the trouble ?

i need your advice

p.s. : sorry for my english but it's not my native language

[Patrick Turner]

wrote:

hi,

I got a mesa/boogie mark IV head and no sound is getting out off
it.

History :
- this amp have sound lost some time ( sound volume drop )
- i change the power tube -- problem not solve

- one day, no more sound, speaker cab and cable are ok

- i can hear sound (when i play guitar) going out from the output
tube but it dont goes true speaker ????

is my power transformer may be the trouble ?

i need your advice

p.s. : sorry for my english but it's not my native language

Make sure all the connections between the head and speaker cab are OK.

Try a replacement speaker, to find out if the problem is in the speaker
or the amp.

If you hear sound in the tubes, and probably in the output tranny,
it may mean there is no connection between speaker and amp,
or the speaker has fused open, and can no longer conduct current through
it.

Patrick Turner.