Recent content by lovetoboogie

Howdy all... Just bumping this a couple of years later to see if it's surfaced. Thanks! 🎸

That is awesome news. Thanks for verifying that. I have a late 73 head that seems to be a prototype. Property tag era. All the ones with the gloss faceplate that I had seen previously were the Japanese clones.

That's an early Aidean Zoom copy made in Japan... Also known as a "Meisa". There are alot of em' out there before Mesa got their lawyers mobilzied. They ironically can sound good with a little love...

Congrats my friend!!! You just successfully narrowed down an intermittent component. Your video helped us do it. That looks to be C511 on our Black Stripe Schematic. It's rotated completely opposite where it should sit. Here is the board layout and schematic so you can position correctly...

When you get a chance can you post a clean pic of the chassis guts. A good overhead of the whole or maybe in three sections R-L... Often one of us will just see something amiss. If you have a good pair of insulated(rubber handle)needle nose pliers you can do the following... With the amp...

You will need a chopstick and start looking around with it to find the loose component or connection. Since you replaced several caps you should start looking in those areas. You can clearly hear in your YouTube video that it is something intermittent. By tapping on it you are giving the chassis...

You have something relatively easy to track down. It's an intermittent connection with a component or connection somewhere. Question, was it making that noise by tapping before you changed the caps, or after?

Hi there, Welcome! ...and there are several peeps here that can help you troubleshoot. In the meantime a board member has completed a seriously thorough breakdown of each Stripe model. Here is the link... https://forum.grailtone.com/viewtopic.php?t=83605 ...follow down the thread to the Red...

Howdy Mesa Boogie peeps... It pains me to announce this amp has gone "missing". It was shipped from NYC to Japan and "disappeared" in transit in the Independence, Kentucky area. So this would be the Greater Cincinnati, Ohio area as well. The cost of the amp is less important than the personal...

No, the plate voltage on the PI tube(pin 1 & pin 6 of V5) is not the same as pin 3 on the power tubes. The plates of the Phase Inverter "see" anywhere from 275-350vdc depending on Mark Series amp... If you are seeing 500vdc on the plates(pin3) of the power tubes then you have a 105 Power...

Wholly unnecessary to replace the .1uf output coupling caps. The PI circuit has a very low plate to cathode swing causing little or no current. All you are left with is the plate voltage at the input of the caps which is a non-issue even after a cap job. The modern polyester film/foil Orange...

Outstanding work and effort my friend. This will really be useful to help keep Mark III's up and running. And more importantly to respect their differences when doing service work. Quite impressed!

I would just like to chime in again... In my experience the LDR's in the Mark IIC, C+ and Mark III's are very hardy. It's rare that I have had to swap any out EVEN with a total meltdown on the low voltage rail. These are good suggestions you cats are making. The OP has been unclear at best...

Another thing to look at which is notorious on Mark III's is the under spec'd 680 ohm resistor on the low voltage rail... If that starts to cook out the first symptom will be switching problems...shortly after that it will burn right through the board.

On the heels of Mesa doing the upgrade, all info provided points to PT core saturation with that elevated AC particularly at 50 cycles...It's beyond my pay grade but it has to do with the magnetic material in the PT and flux lines. Some power transformers are just marginally rated to begin with...