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auto tuba plans?
Posted: Wed Jul 16, 2025 4:00 pm
by J_Dunavin
well, my $35 MCM driver finally gave it up after 13 years. I think the only reason actually is that i dropped it and i bet i messed up the alignment and then tried to play it and cooked the coil... it's froze solid.
You can still get the MCM diver from Newark.
Curious if the plans have changed since 2012?
Maybe i'll build it wider and go with that Dayton 10" option... though sure was fun to let people listen then tell then what it really was

Re: auto tuba plans?
Posted: Wed Jul 16, 2025 4:13 pm
by Bill Fitzmaurice
No changes other than more driver recommendations. Recommended tens are the Dayton DCS 255-4 and LS10-44, Ciare HS251 and PowerBass S-1004.
Re: auto tuba plans?
Posted: Wed Jul 16, 2025 6:37 pm
by Seth
Joe, send me a PM. I'll send you an MCM driver for whatever the shipping cost is.
Re: auto tuba plans?
Posted: Wed Jul 16, 2025 7:27 pm
by J_Dunavin
Thanks for the quick replies!
Seth, i sent you a message
Re: auto tuba plans?
Posted: Tue Jul 29, 2025 8:22 pm
by J_Dunavin
Why oh why did I use Loctite on these 8/32 screws
All but three of them came out ok, had to get a little creative in getting the other ones out
I just ended up using some much wider 10/32 t nuts and screws that I already had. Wood screws may have been better, but i only have one door on this guy and the t nuts are handy when your reaching around ... trying to blindly find the hole.
Thank you Seth, got the replacement MCM in there and we are back in business!
Re: auto tuba plans?
Posted: Sun Aug 10, 2025 9:04 am
by jimbo7
I remember the agony of getting to the back screws on my first AT build. I then purchased a right angle screwdriver ratchet and all was well (easier at least). When I build my newest AT I made access panel on both sides. Almost a requirement and not much more work.