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Classified / Need an 8 ohm speaker for a Sunn Sceptre 412 cabinet.
« Last post by Whipsaw on November 12, 2017, 03:24:55 pm »
Hello, Would anyone have or know where I can get a Sunn 8 ohm 12" speaker for what I think is a late 60's or early 70's Sunn Sceptre 412 cabinet? My email is Thanks, Bob
Q & A / Re: 70s (vibrato/Reverb) footswitch wiring
« Last post by GrannyGremlin on November 05, 2017, 09:50:57 am »
Cool; thanks for the confirm.
Q & A / Re: 70s (vibrato/Reverb) footswitch wiring
« Last post by Isaac on November 05, 2017, 09:06:46 am »
I used a Peavey foot switch with my Sentura II for several years. It has a TRS plug. I used a Radio Shack stereo jack to dual RCA plugs to mate it with the amp, so I don't think you'll have any problems.
Q & A / Re: 1968 Sunn Sceptre reverb troubleshoot
« Last post by GrannyGremlin on November 04, 2017, 10:43:31 am »
Both of my vintage Sunns came to me with the reverb not working (1200s and a Solarus 6550 version).  In both cases the fix was to clean the reverb jacks and plugs at both ends; probably never been cleaned and they're old and grimey.  Surprised me that it was something so simple, but like I said, same fix on both amps.
Q & A / 70s (vibrato/Reverb) footswitch wiring
« Last post by GrannyGremlin on November 03, 2017, 09:46:56 am »
So I found an old Sunn footswitch, period correct for my 1200s and Solarus amps, but someone has previously used it as a chassis donor for some other type of device (there was a large cap and a relay in there when I got it; lots of leads not connected to anything at 1 end).  I want to wire it up and put it to use.

My question: Are the ground (sleeve) wires for both RCA jacks common (or can they be without causing issues)?  Specifically, I was hoping to be able to use balanced mic/line cable (2 conductor coax w shield) from switch to amp vs dual monoconductor coax cable (i.e. hifi interconnect  or 2 x guitar cable) which would be bulkier.  Any reason I shouldn't do this?

Since this is pretty much chassis only, I was going to put a TRS jack at the switch end and have a detachable 1/4" TRS to dual RCA cable as the interconnect.  Also considering adding indicator LEDs for both FX (since all the stomp switches I have are at least 2 pole anyway), but maybe that's not worthwhile.  If i do it would be battery only (it would last forever just powering 2 LEDs and be cleaner than running a power cable to it).
Q & A / Concert Controller 2 - Loud Pop When Shutting Off
« Last post by Jeff Troy on October 27, 2017, 04:12:46 pm »
Hi, Guys,
I'm pretty decent with cosmetics, but I don't do electronics and my repair guy is gone.
I use a Concert Controller 2 (6-CH) for rehearsal with a swing bad - only two vocals and we don't mic anything else - but when I turn off the unit, it makes a horrendously loud pop.

I'm only running a pair of sunn floor monitor speakers in the rehearsal room, but the last time I switched off, it did some damage. I didn't know that anything was wrong until the next time I turned it on, and then it was pretty clear that the the mixer has a problem. The horns in the monitors seem to respond, but the speakers do not. Pretty sure the pop in the controller blew them out.

I plugged in a 412SR cab and a Concert Horn Accessory. They all work fine. I went back to the monitors and still no speaker response. All the hookup cables are good, and it's unlikely that the speaker wiring inside both monitors would go south at the same time.

Anybody know what this is, and how to fix it? Someone mentioned something about a capacitor on the on/off switch, but he never followed up. Please help if you can.

Please respond to  I don't get on this site so often anymore.

Thanks and regards...
Classified / Coliseum 300 with two 215SH cabs
« Last post by claytoy on October 25, 2017, 08:03:17 am »
In Costa Mesa CA 92626 - speakers stock sq mag recently re coned -- check out pics. 1000$   Clay 714 380 2417
Q & A / Re: Sunn 215B buzz/rattle.
« Last post by Isaac on October 25, 2017, 07:10:17 am »
Before giving up, I'd rotate the driver. It could be cone sag. When reinstalling, make sure the hardware is snug, but not overtight. Overtightening can warp the frame, causing this exact symptom.
Q & A / Re: Concert Bass Mid control not working
« Last post by _peter on October 25, 2017, 04:03:26 am »

according to this schematic:
the bass pot isn't stacked on the mids pot as in the usual fender/marshall tonestacks.
With bass at zero, the signal at the mids pot is shorted to ground. Therefor the mids pot can't work in this situation.

Q & A / Re: Sunn 215B buzz/rattle.
« Last post by _peter on October 25, 2017, 02:14:58 am »

there either seems to be an object between the coil and the magnet or the coil isn't centered anymore.
In both cases there's nothing you can do about it but recone or swap the speaker.


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