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Heres a tip for more bass from Mesa Quad Preamp. The trick is middle knob pulled deep. This adds tuns of bass in combination with the Graphic EQ with the 80hz up near top line and the 240 in between half way and top line you should get mega Bass. I use a Mesa/Boogie Road Ready 4x12 with 2...

Well you know whats first on Troubleshoot list Tubes. Some power tubes tend to pop when standby switched on. I installed Matched 4 new TAD 6L6 in my Stereo 2:90 and a loud pop, and I see the purple gas flash with the rush of high voltage. I install a Matched set of JJ 6L6 and the pop is reduced...

1st off I am an E E and repair and mod amps, V1 & 3 are very important but in a cascade gain structure all those gain stages work together and small differences ad up at the end of the line. I have found a formula I like for my MK3 red stripe. V1 Mullard reissue 12AX7 witch has the most gain &...

Ok thats wrong at least for my 2:90.. CHB is in the center and CHA is last left in photo.And with those Phase inverters Drivers the main thing is to have matched half's there are 2 circuits in each 12AX7'.. I have the Blue light 2:90 version.

One weird thing I have a collection of about 100 power tubes and I have only found one supper microphonic tube a JJ6L6 that I got with the 2:90 amp. Some have a tiny amount of microphonic noise but nun like this one. The guy I bought it from said he got these in a comp set from a famous vender...

Yes its the power tubes also preamp tubes can ad humI know Im late on this post SEE the post,, HUM in MESA STEREO 290 SOLVED that explains it.

HUM in MESA STEREO 290 PROB SOLVED. First don't asume its in the preamp because its not,at least most of the hum. I removed the preamp tubes. Its a supper microphonic power tube. After doing some tube taping with the level all the way down, I tapped on one closest to the output plug, it was like...

Holy cow thats a big tank just for one channel, Its sounds like overkill to me. One channel op you must keep the level on the not in use ch @ 0.00 and the presence @ full 10. Or can you switch 1 channel on and leave 1 off the manuals are on google. Reliability that depends on how old your...

Mesa Stereo 2:90 Hum on chB only when Deep & Modern engaged .Its only on chB and most loud when level turned all the way to left @ 0.00 and most quiet @ 50%.. I have seen several post on the web but no good answers. Some have it in chA this time its in B and brand new ones don't have this problem.

Ok I might be a few months late but. The 6CA7 is EL34, its a better variant, if you find a Sylvania fat bottle with dual halo getters on top thats the old STR 416 used it the 80's boogie's. And enough of the old "these guys just rebrand tubes" look up all the stuff on tube manufactures. Tubes...

Oh right forgot about ESR. I do have an old B&K esr meter but the curve tracer is similar in that it uses a 60Hz AC sine sweep and esr testers use high frequency around 100khz. As the curve trace gives you a quick pick of a section of a circuit or a single component. You can see resistance on a...

There seams to be some confusion on if or when to recap your older Boogie's. First off I am only talking about the power supply filter electrolytic caps. Lets start with my first MK3 I got it about 4 years ago, it had sum hum, so it was do for a check up. I have 3 or 4 ways of checking caps...

Thanks that will soothe my OCD..

FTSW prob. EQ in Mark 3 red stripe works but not exactly as the manual states. " Graphic Equalizer. The front panel toggle switch offers three choices: EQ OUT, EQ IN (all the time), and EQ AUTO. In the AUTO mode, your Equalizer is programmed to switch-on automatically when you go into the Lead...

Boogie uses LDR's because they don't make pop sound like relays. That's the only advantage. Hex buffer electronic switching is one of my faves used in the evil empire carvin X100b s and other modern amps.

Most electrolytic capps start to fail after ten years, and should be checked using a good cap tester. You have to discharge and disconnect one leg. Of coarse I m an EE Engineer and would not recommend for the untrained. I recently got a MK3 Red stripe 100w with all options. I checked all the big...

Pin3= Plate Pin2=Heater Pin7=Heater. I measured from pin 3 to pin2 & found similar results on pin 7 to pin3 . I also use a amp moded just to test tubes and this tube started internal arking in standby mode. These are symptoms of blown tube from old age long hours or high voltage abuse.

I won a pair of Mesa 6CA7/EL34 STR416 ,claimed to be NOS NIB . But when I tested them one tube was perfect 39mA @ 444VDC, the other tube was shorted from plate to heater. On my Fluke DMM plate to heater reads 160k to 190K. My question could this happen in shiping ? It was shiped 4000 miles from...

Get any of there live DVD's like a greatest hits with video.

In later years THE WHO did use Boogie's. On who are you and the later tours he switched from Highwatt to the triple Boogie stack. As far as the Plexie thing it's hard to keep a plexi sounding like a plexi . If you need the VanHalen sound first you need NOS 6Ca7 Fat Boy's, then the VanHalen...