Search results

Hi / Hallo brianf danke, mir geht es gut! Hier in Wesel am Niederrhein fühle ich mich sehr wohl. Ja, ich kenne Wupperthal, die technische Akademie dort habe ich berufsbedingt ( Elektrotechnik ) schon öfter besucht. Auch in dem Zoo war ich schon 2-3 mal. Ich hoffe das es auch Ihnen u. Ihrer...

Hi boogiebabies, thanks for your reply. I think you are right, it`s a good idea to run the MK IV in Fullpower once a month. Maybe the caps in the MK IV got too used to the reduced voltage in Tweed mode over the years and the suddenly higher voltages in Full power mode caused some stress to the...

Hi, I think I would not do it, especially if I would be satisfied with the sound, as it seems to be in your case. As you know, things have mostly two sides and often one's "must have feel " is bigger as the real advantage of a thing, after having it :) regards

Hi all, since 1991 I like to use my MK IV combo always with the Tweed Power mode, mostly Triode/Class A, somtimes also Simul Class. Yesterday I switched the amp to Full Power, just to check out if all is still o.K. I noticed some kind of crackling noise coming out of the speaker. The noise...

Hi all, just reading this interesting thread. I bought my MK IV in Jan 1991, so I guess it's a 1990 model. Regarding the possible power modes of the simul class power amp, here is what the original manual says: Class A , Full Power / Triode - around 30 watts before clipping or 50 watts in...

Hi, the component with the red dot is a electrolyt condenser. such caps tend to dry out over many years of use, some do some not and seem to last ever. But your Mk IV is around 16 years old and so if you have luck, this cap was simply worn out and his last action was to say goodby with some...

Hi, sorry to hear about your problems with your Mk IV. According to your description I would recommend to have a phone call with Mesa Boogie directly. The guys there are very friendly and try to help as far as possible. IMO, it is surely necessary to have a look inside the amp and your FU3...

Hi, I never understood, why many MK IV user are the opinion, that the R2 channel is nearly useless. I remember the test review in the German guitar magazine "Gitarre + Bass" from Jan 91. According to this all in all very positive review, the R2 channel was the most musical channel, good as...

Hi, I use my MK IV combo mostly at home in a hobby room. My usual settings of the power stage ( 4 x STR 425 5881-6L6 ) are mainly Tweed Power, Class A and Triode. With the Output Level set between 2-3 and the Masters around R1 4-5, R 2 3-4, Lead 2 - 3, R1 Gain 7-8, R2 Gain 7, Lead Gain 7-8...

Hi all, so I have a MK IV from 01'91, here my most used settings for comparison: R1 7-8 R2 8 tone R1 Treble 6, R1+R2 Bass 3, R1+R2 Mid 5, R2 Treble 5-6 Lead Gain 7-8, Treble 7, Bass 3, Mid 6-7, Lead Drive 4 - 8 Presence R1 5, R2 3 pushed, Lead 3 pulled Masters R1 4, R2 3, Lead 2-2 1/2 Output...

Hi jukesgtr, actually no, it was adressed to fatboy! But perhaps I have misunderstood something in the former posts, if so sorry. I'm from Germany and my English surely isn't the best until yet and sometimes it is a little bit difficult to understand the sense behind the lines. BTW, nothing...

Hi Monsta - Tone, I couldn't say it better, you are the man! Totally agree! Really, I appreciate your arguments, that stays for a lot of knowledge and most important experience with tube amps. I think, one can learn a lot from you. So perhaps fatboy should open his mind a little more for the...

Hi, from a strong technically view also a transistor amp does the same job as a tube amplifier. If the manufacturers had have the opportunity 50 or more years ago, to use transistors instead of tubes, they surely would have done this. Remember, beside the tone of a tube amp we love, there are...

Hi all, great thread although I'm asking me, what in the hell fatboy really want's to tell us. For example, on one hand it's a great fun for me to play guitar on the other hand I like very much to deal with all aspects around tube amps and their technology. And so of course it is also very...

Hi, I think it is gradually a well known fact, that different brands and types of caps in the signal way have a audible influence on the tone. So far, I only can believe and agree with boogiebabies. Of course it depends on everyone's personal taste of tone and the quality of the ears one has...

Hi, unfortunately I have no schematic of the DC 10. But my experience with my MK IV is, that all the less strange effects / problems which occured over already 15 years now, were tube problems. Also such effects like volume jumps ( Mostly bad power tubes ) Ok, if not already done, I would...

Hi, I know I know....... of course you are right. Normally, when I´m repairing a tube amp, I like to do it exactly the way you mentioned. But as I already said, until today there was no need to carry out the chassis of my MK IV and just for fun it was too much effort for me. But as you already...

Hi, the 49,5 mA for the left outer tube in Full power was a typo, sorry. But you are right, fearly hot, ar least for a boogie. A lot of people are the opinion, that Mesa amps like to sound a little bit steril or lifeless ( mainly clean sounds in comparison to a good fender ) because they...

Hi, nothing against a bias pot modification with a Mark IV. But one must consider the fact, that the power stage is simul class, IMO ! The class A section run's hotter ( more idle current draw ) than the class AB section, althought I wouldn't say that the class A section is true class A, more...