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Boogie Mk1 Reissue Impedance?

Dharmajester

Member
Messages
295
Just picked up a Boogie Mk1 reissue head.

Manual is rather ambiguous.

I get that in 100watt mode I should run a 8 ohm speaker from the 8 ohm out and that in 60watt mode i need to run two 8 ohm speakers from the two 4 ohm outputs.

However if I run it with 6l6’s at 60watt and tweed setting what impedance do the speaker outs become ?
Any advice would be appreciated
 

revgsmall

Member
Messages
2,106
No, you are not getting it!!!! You can run the amp at 60 or 100 watts with the proper impedance load. If you are just running a single 8 ohm speaker you just plug it into the 8 ohm jack in the back. Mesa says that you can run it into one of the four-ohm jacks and it won't hurt the amp. Personally I don't like the sound at all.

If you are hooking up two separate 8 -ohm speaker cabs, then you can and probably should plug each one in to the 4-ohm speaker jacks. You can also run a two twelve cabinet wired in parallel with 8 ohm speakers (which wired in parallel is a 4-ohm load) and run that into the 4 ohm jack.

All the above combinations can be run at 60 or 100 watts with no damage to the Mark I. I prefer the 100 watt mode to get that great, clear bottom end.

As far as that goofy tweed setting, I gave up on it. You can run 6v6 tubes instead of 6l6 tubes, but only in the "tweed setting" . To me it sounded like a thick blanket over the amp.
 
Last edited:

Dharmajester

Member
Messages
295
Yes, that would be logical, however the manual states:

With the toggle switch down ( 60 watt position ), the two middle power tubes are in a “standby mode”, thus reducing the overall power to 60 watts rms. To achieve full efficiency in this position, the speaker should be connected to either of the 4 Ohm speaker jacks.

and also :

Keep in mind that this mismatch ( 60 watt position - 8 Ohm speaker jack ) is a mismatch in the lower than proper match direction. This causes the 6L6 power tubes to wear faster, and produces a much “harder” clip. Again, we encourage you to experiment and find the tonality that suits you best.

Which makes me wonder what exactly is going on ?
 

DanR

Member
Messages
3,641
Basically, at the 100 watt setting, the amp/OT wants to see an 8 ohm load. At the 60 watt setting, as two of the power tubes are disabled, the amp now wants to see a 4 ohm load. Mesa kinda encourages trying out mismatches, but the 100 watt/8 ohm and the 60 watt/4 ohm are the proper matches.
 

charley

Gold Supporting Member
Messages
3,399
On a side note, I agree that I definitely like the Boogie MK1 RI in 100w mode better. It is loud, though. Try swapping out the stock 12ax7 tube in v1 for a 12ay7. I did this to mine, and it lowers the overall gain, making the amp more Fender-y to my ears. And a bit sweeter sounding too.

I've had my Boogie MK1 RI for about 10 years, and I am still using the original Mesa 6L6's that came stock. I have only ever used the 8 ohm speaker jack, and have run the amp in both 60/100 w modes with no problem.
 

RussB

low rent hobbyist
Messages
11,158
Yes, that would be logical, however the manual states:

With the toggle switch down ( 60 watt position ), the two middle power tubes are in a “standby mode”, thus reducing the overall power to 60 watts rms. To achieve full efficiency in this position, the speaker should be connected to either of the 4 Ohm speaker jacks.

and also :

Keep in mind that this mismatch ( 60 watt position - 8 Ohm speaker jack ) is a mismatch in the lower than proper match direction. This causes the 6L6 power tubes to wear faster, and produces a much “harder” clip. Again, we encourage you to experiment and find the tonality that suits you best.

Which makes me wonder what exactly is going on ?

That is crystal clear. What are you missing?
 




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