The sunn Forum
Sunn Musical Equipment => DIY => Topic started by: HRobert on February 14, 2010, 06:51:59 pm
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Finally, after several unwanted delays, the cabs for the Sentura II are finished. I've included 3 final pictures; The cabs open showing the twin JBL K-130's in each cab, the back of the cabs after closing them up, and a pic of the fronts of the amp showing those great aluminum domes showing through the grill cloth.
Thanks to everyone for looking at my various posts, and for the great comments and support during the project.
A special thanks goes out to Conrad for providing the corners, and for building such great amps.
Robert Freer
Milwaukee, WI
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Was it good for you? It was great for me. Nice work.
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Bravo Robert! They look absolutely magnificent!
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Beautiful!!!
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Great job on the cabs !! Really a nice looking rig,hope you get lots of playing time with it,looks like it'll rock pretty good !! Mel.
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What makes you think your amp is a 67? Wouldn't it have numbers on the front panel and just an arrow on the knobs? Are those Fender knobs?
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What makes you think your amp is a 67? Wouldn't it have numbers on the front panel and just an arrow on the knobs? Are those Fender knobs?
This amp is marked 67 on the inside of the chassis. It originally had the silver diagonal grill cloth, but it had holes that made it unacceptable for use. I replaced it with the fender style. The outputs are marked "speaker" and "external speaker" where as I believe that "68" Sentura outputs are marked 8 ohm and 4 ohm. The "69" model had the addition of a mid-boost switch.
The knobs were purchased from John Bono ( who is on this site also ). They are manufactured by Rogen of Chicago - as were the originals - and are numbered from 0-10. Fender knobs are shorter with a slightly larger diameter skirt and are numbered from 1-10. The "67" Sentura II did not have pointer knobs with the numbers on the front panel. This is my second "67" Sentura II ( I got my first one -NEW- back in the 60's when I was in high school ) and my first "67" Sentura II had the same front panel and knobs as this amp.
Robert
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Was it good for you? It was great for me. Nice work.
It was a fun project and was a lot of work, but I'm looking forward to my next project. I learned a couple of things and will make some modifications in the future.
Thanks for your comments.
Bob
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The cabs look magnificent! (And I bet they sound pretty good, too.) Great job!
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The cabs look magnificent! (And I bet they sound pretty good, too.) Great job!
The other day I plugged in my Kurzweil PC2X keyboard into the Sentura. I had the keyboard set to a concert grand patch. I set the bass, Treb, and contour on the ampto about 5 each, and put the volume on 2. Had the keyboard volume up about 1/2 way.
Played a nice fat "C" chord with the right hand and an octave of "C" in the lowest octave in the bass. The wife came down stairs and told me to "Turn it DOWN....your rattling the dishes in the cupboards and I can feel the vibration through the floor" So.....I guess the amp works very well :-D
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Sweet rig! My ears ring just looking at it!
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Rob...nice rig man.
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Rob...nice rig man.
Thank you for your comment. I believe that the JBL speakers do a lot for the Sunn sound. Conrad's first Sunns had JBL's...they're so efficient.
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Sweet rig! My ears ring just looking at it!
Thanks. I can't wait to get out somewhere where I can turn it up.
Rob
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How about sneaking into the baseball stadium next time the Brewers are out of town? :-D
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How about sneaking into the baseball stadium next time the Brewers are out of town? :-D
Tooo much glass to replace if I break something :-D
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Maybe this is a stupid question, but here it goes:
How are the speakers in each cab wired up? In the first pic, I see that the individual speakers are hooked up to each other, with positive to positive, and neg to neg? I'm pretty n00b to these sort of things, but that doesn't seem to be series or parallel. The next question is where to they hook up to the external jack, the wires appear to dead end.
'Course, I could be an idiot, and those could just not be wired up yet.....That's probably the case, huh?
My other question is, I'm not sure whether these cabs were restorations, or scratch builds, but if they were scratch builds, where did you find the external jack cups? The telecaster style ones. I've searched and searched and cannot find them anywhere for my build!
One last thing: What type of screws are used for the back of these cabinets? It looks like they have some sort of sleeve. Any info would be great.
Anyways, these are absolute beauties! Love the whole setup.
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Maybe this is a stupid question, but here it goes:
How are the speakers in each cab wired up? In the first pic, I see that the individual speakers are hooked up to each other, with positive to positive, and neg to neg? I'm pretty n00b to these sort of things, but that doesn't seem to be series or parallel. The next question is where to they hook up to the external jack, the wires appear to dead end.
'Course, I could be an idiot, and those could just not be wired up yet.....That's probably the case, huh?
My other question is, I'm not sure whether these cabs were restorations, or scratch builds, but if they were scratch builds, where did you find the external jack cups? The telecaster style ones. I've searched and searched and cannot find them anywhere for my build!
One last thing: What type of screws are used for the back of these cabinets? It looks like they have some sort of sleeve. Any info would be great.
Anyways, these are absolute beauties! Love the whole setup.
First of all, thanks for the complement. I'll try to address your questions in the same order as posed.
The cabs are scratch built. (Check out my other Sentura II posts to see other pictures). I used 11 ply birch plywood throughout - sides, backs, and baffles.
The speakers are wired in parellel + to + and - to -. The speakers are 8 ohms so each cab has a 4 ohm load. The JBL's have spring post connecters for the wires so no soldering is needed at the speaker. The lead wires are soldered to the input jacks so with the backs off they didn't show.
The Fender style "jack cups" are from a company called Parts-Is-Parts. Check out their web site for all the items that they carry. When I bought the cups they were $6.00 a pair.
Lastly, the screws for the back of the cabinets are stainless steel oval head phillips screws with nickle plated cup washers. All the screws used in building the cabinets and attaching the the baffle board to the frames, along with the hex bolts for the casters, are zinc plated steel. The rest of building hardware - T-nuts, bolts for the handles and speakers, chassis bolts, and corner screws are all stainless steel. The cabinet corners were purchased from Conrad Sundholm.
Thanks for looking at my post.
Rob