Boogie Fillmore 25

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CraigGa
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Boogie Fillmore 25

Post by CraigGa »

I have a Boogie Fillmore 25 as my lounge amp (I know but she said it had to be something small :D )

It's a two channel 6V6 amp, the channels are identical and each have Clean, Drive and High modes.

In Clean mode it sounds awesome with a strat but in Drive and High it has always sounded really "bitey" with humbucker guitars on the bridge pickups and I've never been able to dial it out successfully. Anyway I was reading a thread on here and someone mentioned bright caps and a light bulb came on!

It can't be that hard to open it up and see if there's a cap across the gain pot can it? It turns out that the answer is yes it can!

It turns out that it's actually a single channel amp with two sets of controls and 19 DPDT relays to reconfigure the circuit depending on channel and mode!

I managed to find two caps that were connected to the gain pot wiper on channel 1 and the other side of one was connected to the top so I pulled it, it turned out to be the Clean bright cap so that went back in and I pulled the other and that seems to have done the job. It appears that there are different bright caps for clean and drive/high but they're only connected across the gain pot of the channel in use. This was a case where a standby switch was very useful because it let me probe around and change channels/modes without having B+ in there.

If anyone can point me to a schematic that would be greatly appreciated but for now it's sounding great.

Craig
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Stevem
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Re: Boogie Fillmore 25

Post by Stevem »

You may to find a Mesa tech/ dealer who can slip you a schematic under the table so to speak!
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CraigGa
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Re: Boogie Fillmore 25

Post by CraigGa »

Stevem wrote: Thu Jul 22, 2021 10:14 am You may to find a Mesa tech/ dealer who can slip you a schematic under the table so to speak!
So they're not readily available? I have searched but not found one.
Thinking about my second build.
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pompeiisneaks
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Re: Boogie Fillmore 25

Post by pompeiisneaks »

I believe that's a current run amp, and most amp manufacturers don't ever want their schematics out, and gaurd them pretty tightly at least until they get put out to pasture and aren't a current model. The only way to get them during this type of 'active amp' status is to be a certified amp tech for the company and they then make you sign NDA's or some such saying you'll not let the schematics leak. If they find out you did, you're in for a world of hurt.

thus the suggestion of having someone get you one on the sly...

They'll likely need to trust that you'll not let it out to the world.

~Phil
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CraigGa
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Re: Boogie Fillmore 25

Post by CraigGa »

Ok thanks,
hopefully I won't need one for quite a while, it does appear to be very well built.

Craig
Thinking about my second build.
TUBEDUDE
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Re: Boogie Fillmore 25

Post by TUBEDUDE »

19 relays? I'd rather add another channel than do that! I hope their socketed. Just another messy booger I'll refuse to work on.
Tube junkie that aspires to become a tri-state bidirectional buss driver.
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