SVT-4 Pro Distorting Help

[jaxlaw]

Ok! My SVT-4 Pro, that I have had the last six years has started to distort badly when first turned on. The distortion will go away once the amp get warmed up the problem is it used to take 5 minutes then half an hour and now longer than that. once the amp get going I get clean tone out of it, but when I first turn it on it gives me the sound of tearing paper. Any ideas?


Jaxlaw

 

[renniw]

Could be a bad preamp tube...

 

[Jerrold Tiers]

Could be a crummy solder joint too...... that warms up, expands, and works right.

 

[rbonner]

I'm with both of those guys, could be either... Personally I think the preamp in the 4PRO is the weak link of a fine amp... If you can lay your hands on another preamp... An AMPEG would be the best, plug it into the pre in and see if your final behaves itself.

MY GUESS is it will be just fine... Matter of fact... If you have an active bass, just plug it directly into the channel A in... and see if the crackle is still there as she comes up cold.

CRACKLE you have either power supply or power amp issues, no crackle you know she's got an issue in the preamp and thats a separate board. BOTH Renniw and Jerrold's tests can be run on the preamp even by yourself if you are handy...

DO NOT TRY AND SCREW WITH THE POWER BOARD, even if you are a god in repair work. Its in there tight, things are small and its nowhere for less than a seriously AMPEG experienced tech.

BOB

 

[rbonner]

I just hate it when you give a guy a couple ideas and he goes POOF on you...

HELLO?

 

[B-string]

Now you know how the girls feel? I'm going to h-e double hocky sticks for that one

 

[rbonner]

Now you know how the girls feel? I'm going to h-e double hocky sticks for that one

Hey there Bee Sting... Yeah reremind me, how many days is the max? Are you supposed to call them the next day, or is it the second day, but never more than the second day?

I've been outta the dating thing for like 30 years and am all confused...

My MOM called today and was asking me if I was coming to visit for Christmas... Remember she lives up in Bullhead... If I do I have to see you and then head over to Cali to see JohnK

BOB

 

[B-string]

I'll be waitin', Havasu is usually nice in December! Have to see if we can arrange a practice and have you sit in? Our bookings are still open in December, just let me know if you only play 4 strings and I'll put a new batt in the 4 string.
Jon