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Hi Chaps, Thanks very much for your replys - I think this may be a circuit board related or a wire problem tho, I may have to get it checked over by the service guys. The reason I'm thinking this is I swithed the amp on yesterday and the Reverb was working - switched it on today and it's not...

Hello chaps! The reverb seems to have 'stopped working' on my F50... just wondering if any of you guys have had the same or similar problem? If I shake the reverb unit you can hear the sound of the springs moving through the speaker but it's very faint.... I've checked the connection plugs are...

Hiya Hobo, Yep, exactly what the guy who repaired my amp said he had done. This seems like a common fault on these amps - As I said in my earlier post, I'm gonna make sure I replace the 2 power amp valves on a regular basis. Thanks :o) Leon.

Hi Peeps, I've now got my F-50 back and it's working great - Exactly the problem Mikeyp suggested - The Screen Grid resistors needed replacing on the circuit board next to the valves, it wasn't an expensive job, cost £36 pounds. Thanks! Leon White.

Hi Mikeyp, Thanks for your post... I've taken the Amp to my local Tube Amp specialist and first thing he mentioned was a 'Screen grid resistor' so that sounds like a similar problem that happened on your amp - they are gonna have a look at the amp next week for me so I'll post again when I've...

Hiya there Chaps, Just wondering if any of you tech types could shed any light on this... OK, so my F-50 failed at a gig - the sound was cracking/cutting out then there was a bright flash at the back of the amp while it was switched on (inside the grill) followed by a burning smell - I presumed...

Well Mr 155, a gold star for you... It was the 2 6L6 power tubes, so I've ended up replacing all the valves in the amp! Oh well, al least it works now. I found this out when I replaced with the new 4 x 12AX7's and the problem was still there - borrowed 2 x 6L6's from my mates amp, stuck them it...

Hi Decosimo, I got 4 Mesa 12AX7's, haven't get 'em yet - hopefully will solve the problem! Leon.

Hi chaps, Thanks very much for you advice! I've ordered 4 new pre-amp valves so hopefully that will solve the problem... I keep ya posted if it doesn't! Thanks again, Leon.

Hi There, Wondering if anybody can help me here. I'm not very tech minded tho so hope I don't sound too dim in this post... Anyway, my F-50 amp seems to sound fine through the 'clean' channel, but is crackling/spluttering at high volume through the distortion/contour channel. The two large...