Loud POP when I go into standby

[RichS]

My F-50 makes a loud POP every time I engage standby. Any ideas what might cause this. More importantly, any idea how to fix this.

My buddies F-50 does not pop at all toggling the standby switch in any direction.

Also, my F-50 has a more compresssed sound than my buddies F-50. His is a little more in your face & wider sounding. We traded tubes to see if that was the cause of the difference in tone but it was not. Any ideas what might cause 2 F-50s to have a slightly different tone. I like hie "in your face" tone better than my compressed sounding tone. The overall tone is very similar but these nuances are very noticable to me.

Thanks!

 

[Platypus]

When was the last time you retubed your amp? Differences in tone between two amps are normal.. but compression and/or loss of tone is usually the result of aging power tubes.

 

[strumminsix]

My F-50 makes a loud POP every time I engage standby.

Then don't put your amp on standby

 

[RR]

My F-50 makes a loud POP every time I engage standby.

Then don't put your amp on standby

:lol:
Remind me on another board someone complaining their guitar hum so bad its unbearable. Obviously the brand / model / pickups were economic type so they were prone to hum.

This person asked: "How do I eliminate the hum?"
member answered: easy solution => "Put the guitar volume all the way off" :lol:

 

[Boogiebabies]

The standby is between your power supply board and your filter choke.
The only idea's I have are that you have a dirty contact, a cap going bad in the power supply ( Any Hum?) or the audible pop is from the output tubes arcing to ground after the power is turned off and draining through the speaker.

I would start with cleaning the switch with some contact cleaner and then proceed to tubes and lastly a visual inspection of the amp. Look for yellow goo on the filter caps, black or burned out resistors or carbon traces.
If you don't feel comfortable poking around in an amp than don't, but you can still look at it.

 

[Mr_You]

Yay Groucho!

 

[TheRazMeister]

How old is your F-50? Take advantage of the 5 year warranty and get Mesa to look at it if you have a local tech. My ROV Combo did the same thing...I had JJ E-34L's in it and they started making funny noises after about a month. I switched to Mesa branded 6L6 tubes and all is well.

My F-50 makes a loud POP every time I engage standby. Any ideas what might cause this. More importantly, any idea how to fix this.

My buddies F-50 does not pop at all toggling the standby switch in any direction.

Also, my F-50 has a more compresssed sound than my buddies F-50. His is a little more in your face & wider sounding. We traded tubes to see if that was the cause of the difference in tone but it was not. Any ideas what might cause 2 F-50s to have a slightly different tone. I like hie "in your face" tone better than my compressed sounding tone. The overall tone is very similar but these nuances are very noticable to me.

Thanks!

 

[alejandro]

Hmm, I just started getting this after I got a 2x6L6/2x EL34 power section by JJ/Tesla tubes in my Tremoverb.

Now I can ascertain it's nothing internal like a bad cap in the power supply area... Are there any long-term ill effects? Like one day, will one of them there 'pops' go from 'suck' to 'blow'?

 

[Mr_You]

You're mixing EL34s and 6L6s? I don't believe the amp was made to do that. Correct me if I wrong.

 

[alejandro]

from Bob Pletka at Eurotubes, a distributor of JJ/Tesla tubes:
Mesa amps are fixed bias and are set pretty cold. The Dual and Triple rectifiers are set very cold and if you're sticking with 6L6 then the amp can really benefit from a simple bias mod to make the bias adjustable and setting it properly or if your using 6L6's then using a cooler grade and running the amp in the EL34 mode and in the tube rectifier mode with either the 5U4's or better yet GZ34's which will get the bias right where it should be.

I've also been doing something new with the dual Rectifier amps called integrated quads. These quads consist of hand picked 6L6GC's and E34L's that all draw the same exact amount of natural plate current which is how tubes are matched. In an amp that has between 470 and 500 plate volts which is what the Mesa Dual Rec's have. These quads can be biased at 36 to 44mA just as you would with a quad of 6L6's or E34L's or in the case of the Dual Rec's these quads can be run with the amp set in the EL34 position and in the tube rectifier mode. The integrated quads do provide a very cool mixture of tones combining the deep thump and clean smooth highs of the JJ 6L6GC's and the aggressive punch and classic British sound of the JJ E34L's.

see http://www.eurotubes.com/euro-n.htm

HA! Take that You! See, Bob is a sane guy.

 

[TheRazMeister]

Bob also sold me a pair of E34L's that lasted about 1 month, started popping and causing the volume on my amp to cut in half. Then he sorta kinda wouldn't believe his tubes were bad and asked me to put 1 6L6 and a E34L in together instead of just sending me 2 new tubes. So basically he wanted me to mess with a $1500 amp to find out if his $25 tubes were good.
The part that irked me most was that he (and the other guy) acted like tubes aren't bad...people are :roll:

BTW - threw in a pair of Mesa branded...no problems..

from Bob Pletka at Eurotubes, a distributor of JJ/Tesla tubes:
Mesa amps are fixed bias and are set pretty cold. The Dual and Triple rectifiers are set very cold and if you're sticking with 6L6 then the amp can really benefit from a simple bias mod to make the bias adjustable and setting it properly or if your using 6L6's then using a cooler grade and running the amp in the EL34 mode and in the tube rectifier mode with either the 5U4's or better yet GZ34's which will get the bias right where it should be.

I've also been doing something new with the dual Rectifier amps called integrated quads. These quads consist of hand picked 6L6GC's and E34L's that all draw the same exact amount of natural plate current which is how tubes are matched. In an amp that has between 470 and 500 plate volts which is what the Mesa Dual Rec's have. These quads can be biased at 36 to 44mA just as you would with a quad of 6L6's or E34L's or in the case of the Dual Rec's these quads can be run with the amp set in the EL34 position and in the tube rectifier mode. The integrated quads do provide a very cool mixture of tones combining the deep thump and clean smooth highs of the JJ 6L6GC's and the aggressive punch and classic British sound of the JJ E34L's.

see http://www.eurotubes.com/euro-n.htm

HA! Take that You! See, Bob is a sane guy.

 

[alejandro]

Thanks for that info, sir. I'll be looking for backup tubes soon based on that.