Fixed : Mesa Boogie Fillmore 50 combo

[TSJMajesty]

The only other thing I could offer is something I read on Eurotubes. They claim that many, many issues (and they also claim they've seen it fix things a lot) can be dealt with by hitting the tube pins with electrical parts contact cleaner, then working the pins in and out of the sockets, to get them making full contact.

But since you already swapped tubes, you probably in essence, already accomplished what this troubleshooting fix would do. But anyway, just sayin'...

 

[gearJunkie]

... hitting the tube pins with electrical parts contact cleaner, then working the pins in and out of the sockets, to get them making full contact.

great suggestion, did it for the power tubes and V4 & V5 preamp tubes as I swapped out the originals for known working "backup" tubes from my collection.

No

Still whisper quiet output, no change. Going to swap in the originals and then try replacing V1 - V3.

 

[Frodebro]

Just touching on the obvious here, but is the speaker cable firmly plugged into the jack on the chassis? I'm pretty sure it's soldered to the lugs on the speaker itself, but sometimes it's the stupid little things that are easily overlooked.

 

[gearJunkie]

Just touching on the obvious here, but is the speaker cable firmly plugged into the jack on the chassis? I'm pretty sure it's soldered to the lugs on the speaker itself, but sometimes it's the stupid little things that are easily overlooked.

One of the first things I checked. Also tested with an external cab with same results.

 

[la szum]

Did you try this yet?

 

[gearJunkie]

OK, the problem is a bad tube in V1, V2, or V3. Now I'm going to swap the originals back in one at a time until we have a winer (or loser really).

Good news is that it's just a bad tube.

 

[gearJunkie]

A bad 12AX7 in V3 (driver/phase inverter) was the cause of the failure. Replaced it with a spare Mesa tube and all is well.

Finally have time to get back to playing.

Thanks for all of the suggestions and emotional support through this difficult time.

 

[paisleywookiee]

Glad you got it worked out!

 

[la szum]

Sweet!

 

[gearJunkie]

The retailer directed me to call Mesa for a new replacement preamp tube. I'm now waiting for a call back from Petaluma.

 

[TSJMajesty]

The retailer directed me to call Mesa for a new replacement preamp tube. I'm now waiting for a call back from Petaluma.

Ok, sure. So I fixed the amp for you, and ok, I guess I can make that phone call as well.

 

[gearJunkie]

Ok, sure. So I fixed the amp for you, and ok, I guess I can make that phone call as well.

I left a message with MB customer support around 12:00 PM EST and they called me back at 1:20 PM. A new rube is now on its way to me.

If you want to get things done quickly, you've got to do it yourself.

 

[TSJMajesty]

If you want to get things done quickly, you've got to do it yourself.

No, I get it. Was just halfway joking.