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Q & A / New guy with probably an old question ?
« Last post by Tomm Williams on January 02, 2018, 02:34:13 pm »
Greetings all !

I recently acquired a nice '69 Sonaro head for a mere $400. I'd like to get a matching cab but (from what I'm seeing) Sunn wasn't exactly into portable/small cabs and I don't feel like lugging around a 2x15", 6x10" or any other box the size of a walk in closet. I have seen a 2x12" but it was from a later era so doesn't truly match. So my question(s) being: Did Sunn make smaller cabs during this period and if not, is the tolex from Angela a very close match? I happen to have a great relationship with near-by J Design Cabs who could make whatever I wish but I'd like it to look correct.

Q & A / Re: Cone Excursion
« Last post by Isaac on December 30, 2017, 10:10:30 am »
No, you're not missing anything. I meant to write, "the cathode bypass capacitor."
Q & A / Re: Cone Excursion
« Last post by eddiemac on December 30, 2017, 09:51:09 am »
Thanks. Just one thing: 
"In this case, the cathode bypass resistor is plenty large enough at 250μF . . ." 
Am I missing something?
Q & A / Re: Cone Excursion
« Last post by Isaac on December 29, 2017, 12:09:41 pm »
Any time there is a capacitor in series with the signal, it will function as a high pass filter. Also, the cathode bypass capacitor functions as a shelf filter, increasing the gain above the resonant frequency with the cathode resistor. In this case, the cathode bypass resistor is plenty large enough at 250μF that there is virtually no roll off above 40 Hz. The biggest bass blocker, I think, is going to be the .002μF cap that couples the anode of the first stage to the grid of the second. The .0075μF cap connected to the LO BOOST switch is there to let more bass through.

IIRC, on the 200S, the high pass is at 80Hz without the switch engaged, 40 Hz with. I would expect the Sorado to be similar.
Q & A / Re: Cone Excursion
« Last post by eddiemac on December 28, 2017, 04:50:01 pm »
Can someone please tell me which specific electrical components are responsible for the roll-off (high-pass filter) in the Sunn Sorado?  I would like to check to see if they are in-spec.  Here's the Sorado schematic (click on the schematic and it will expand):
Classified / WTB: Sunn Beta Lead
« Last post by lucas28 on December 26, 2017, 07:46:51 pm »
Looking for a Beta Lead. If anyone is selling one please contact me! Thanks!
Q & A / Re: Sunn Keyboard
« Last post by Happy Face on December 25, 2017, 05:38:27 pm »
There's a trip down memory lane! Thanks.
Q & A / Re: Solarus speaker wiring help
« Last post by _peter on December 21, 2017, 03:34:43 am »

that's no rocket science.

- each speaker has a positive and a negative pin

- if each speaker is 8 Ohms then parallel wiring results in a total load of 4 Ohms
- if each speaker is 8 Ohms then series wiring results in a total load of 16 Ohms

- parallel wiring: just connect all positive connections (both speaker + and + from amp output) and all negative connections (both speaker - and - from amp output)

- series wiring: connect + from amp output with + of ONE speaker and - from amp output with - of the OTHER speaker; then just connect the residual free speaker pins (one wire from - of ONE speaker to + of the OTHER speaker)

That's it. It's the same for all 2 speaker cabinets and you will find dozens of pictures on the internet.

Have fun

Q & A / Solarus speaker wiring help
« Last post by Guitargasm on December 20, 2017, 08:11:52 pm »
Greetings all. Can anyone who has it please provide me with some good clear close up photos of the speaker wiring attachments for a 67, 68 or 69 Solarus 2x12 combo with two 8 0hm speakers running out of the 16 ohm jack? Mine has been rigged to run 4 ohm and I want to put it back to original, but am no wiring expert or even novice. I can follow pictures though.Thanks!
No, there is no source for those corners other than savaging from other amps.  I ended up buying a doa stinger just for the corners.  Those corners were made to SUNN's order.  They cut a corner off of a Kleenex box and used that as the original.

Here is a message from member Rex B from some years ago...

Hey Steve

No problem, you are welcome to send me messages directly through here, and I am more likely to find them than if you were to post them on the forum.

The cabinets on your Enforcer gear were designed slightly after I left Sunn to work at Fender, but I am somewhat familiar with their heritage. The cabinets of this final pre-Fender era were made by a company in Troutdale Oregon called "Bennett". They were done using a technique called Miter-Fold. I looked for Bennett Cabinets in Troudale on Google, and did not get a hit, so they may not be there anymore. I THINK the edging is a stock vinyl extrusion from some plastic fabricator , but unfortunately, I don't know who.

The corners have a more interesting story. Larry Davis, the mechanical engineer at the time, told me he took a plastic stacking Kleenex box, and cut the corners off at a 45 degree angle, (probably on a bandsaw). They used these as a pattern to make an injection mold for the corners. This is why those corners have kind of a sharp edge on them, and undercut toward the cabinet: they really should have beveled them the other direction so they didn't catch on things when you try to slide the cabinet. People have also been cut on them. 

Regardless, I'm pretty sure Sunn owned the tooling on these, and they are probably not available through a 3rd party. You MAY try to contact Fender to see if you can get any from them, it's possible they may have some old stock. They may also have some of the edge molding, but I am pretty doubtful on both counts. I do suggest that you put a post on the forum asking if anyone has the molding and corners. Some of the employees from that era of Sunn may be more familiar with the suppliers. I would also suggest sending a message to Don T on this forum, he was involved with purchasing and production during this time.

Hope this helps, and good luck with your Sunn gear !

Rex B

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