New Roadster, no reverb at all!

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tvbmetal

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Hi,
Yesterday I had my new mesa boogie roadster. I opened up the back to remove the plastic things from power tubes and change the english lead with an european one (I bought the amp from england and I live in Belgium). I did the same with a marshall tsl 100 that I bought from england and that one works perfect.

I read in the manual that the small tubes could've got some plastic on it too but I didn't notice anything on them. I set up the whole amp and used the 16 ohm straight into a 412 behringer cab on mono, so everything should've be good so far... I turned on the amp, played a bit and switched on the reverb on the footboard, I randomly set up the reverb on the rear of the amp for each channel but no reverb at all on any of the channels...

I thought it could be a broken tube maybe, but after playing I felt each of the small tubes and they were all a little bit hot, so I guess none of them is broken (probably that means nothing if they are hot or not). I'm quite new to tube amplifiers since a month or two when I bought my TSL. I'm a big fan of the TSL and roadster sound so that's why I bought these amps. Oh I also tried to play on the amp without the footboard and I guess reverb is always ON then? Doesn't seem to work without the footboard either...

I might change the small tubes from place so the 'working' ones are in place of the reverb tubes, but I didn't do that yet because I read something about 'bias' and I'm not sure if it's a good idea to change them?

I almost don't know ANYTHING of amps, so I'd rather do some research first before damaging anything of this highly priced but worth the money amps. Does anyone seem to know what I am doing wrong or what could've been broken?

(Kinda off-topic: I tested the slave out too and it seems this one has a shitload of crunchy treble but I guess that's because it's not speaker emulated? I recorded something on my juno G keyboard and put a 'speaker' effect on the dry slave out recordings and then it sounded much more realistic already.)

Any help is HIGHLY appreciated!
 
Check that the reverb tank's send/return lines are plugged in. They are located on the top (tube-side) of the chassis, right next to the Output Tranny (big black thing near the speaker outputs). White wire is closest to the tranny. It's really hard to see them without taking the chassis out.

Dom
 
I think I found out what's wrong already, I checked my preamp tubes and took out the 4th one (reverb tube) and switched it with the last one (driver tube) because I saw they are from the same type. After that I tried the mesa boogie and I don't hear anything at all. The tube also has a white circle on the top which the other tubes don't have so I guess it's just a broken tube? I was wondering if it matters if you use "russian 2" tubes or ehm.. "chinese 1"? I'd like to test the reverb with a working tube, maybe I can take the fifth tube, this one is for fx send/return so I don't use that one anyway. But it's a different kind then the (maybe) broken one of the reverb.
So... do you really have to use the same type or can I try switching number 4 and 5?
Thanks.
 
tvbmetal said:
I think I found out what's wrong already, I checked my preamp tubes and took out the 4th one (reverb tube) and switched it with the last one (driver tube) because I saw they are from the same type. After that I tried the mesa boogie and I don't hear anything at all. The tube also has a white circle on the top which the other tubes don't have so I guess it's just a broken tube? I was wondering if it matters if you use "russian 2" tubes or ehm.. "chinese 1"? I'd like to test the reverb with a working tube, maybe I can take the fifth tube, this one is for fx send/return so I don't use that one anyway. But it's a different kind then the (maybe) broken one of the reverb.
So... do you really have to use the same type or can I try switching number 4 and 5?
Thanks.

Just buy another preamp valve and replace the reverb preamp valve. Preamp valves don't have to be biased, just poweramp valves...
 
Since you have to replace that tube in V4 anyway, I'd recommend trying either now or at some point a Mullard 12at7. Its a lot smoother reverb than the stock Mesa 12ax7. Also I dont know if you were aware but that busted tube is covered under the Mesa warranty so i'd recommend calling the shop where you got it and letting them know what happened, if they dont hep call Mesa directly.
 

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