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Q & A / Re: Does anyone have a Sunn Alpha 210r schematic?
« Last post by loudthud on Today at 02:26:24 am »
This pdf is the only thing I have. It should be pretty close. The Alpha 210r had two 16 Ohm 10 inch speakers.
Q & A / Does anyone have a Sunn Alpha 210r schematic?
« Last post by fubusmaximus on Yesterday at 04:07:02 pm »
Does anyone have a Sunn Alpha 210r schematic?
Q & A / Re: Sunn Concert Bass and bass cab
« Last post by Isaac on February 21, 2023, 09:34:56 am »
Pics always help. I assume the amp looks a lot like this:

Sunn made several 2x15" speaker cabinets. What does yours look like? Also, there should be a plate on the back with a model  on it, something like 215S, 215B, 215BH, or the like. Older cabinets didn't have that, such as the 200S. Reason being that, in the early days, amps were sold as a package deal, head and cabinet together. Later, in the 70s, they went to a "mix and match" concept, where the amplifiers and speakers were sold separately, so the speakers needed their own model names. So, again, pics would help.
Q & A / Sunn Concert Bass and bass cab
« Last post by LeRoy Dehne on February 19, 2023, 11:39:56 am »
Newbee here....i have a solid state Sunn Concert Bass, Red Knob, serial # S-00085,   with a 160 watt , 4ohm, 2-15 bass cab.  Bass cab serial number: S-04891.  Theyre both in excellet condition. Not all beat up from the road.   This thing pumps!  I can get that 70's sound with just about any bass i have, and i have 8.  Im just wondering what years these are and what their value is.  I got them from a older basser guy who purchased them used in the 70's.  pics apond request.  thanx 
Q & A / Re: Looking for info
« Last post by loudthud on January 11, 2023, 11:34:45 pm »
First of all, your pictures are too big for me to view without downloading them to my computer and using Windows picture viewer to scale them down to my screen size.

The number on the back of that speaker, 81 0145 is the Sunn part number for a 15 inch woofer.

Check this thread: 

My guess is that what you have is called "Coliseum Monitor". Not much in the way of pictures in any catalog I have, but the dimensions are supposed to be 21"x25"x29".
I found two different references to a Coliseum Monitor:

1971 "Feel the Sound of the 70's" Sound System catalog
Coliseum Monitor:  One 12" Sunn PA transducer, One high frequency horn with Vega Driver.
Two cabinets lock together face to face for transport, 18" high, 20" wide, 17.5" deep, 50 lbs.

1979 catalog
Coliseum Monitor  100W    8 Ohm
1-15"                       81-0145
1-50W Driver/Horn  81-0294
1-Tweeter                81-5150
Dimensions HWD 21"x25"x29"   51lbs

Not sure about the 81-1300 on the back of the horn driver. Might be a later replacement for the 81-0294 or it could be a different Monitor entirely.
Q & A / Re: Looking for info
« Last post by Adamd1978 on January 11, 2023, 07:20:33 pm »
I finally pulled the back off of the cabinet... It looks to be a 12 inch speaker, looks like a 1974 date of manufacture by Eminence, and the horn is possibly heppner🤷🏼‍♂️... I've got pics also... Oh, the speaker also had a stamp inside that looks like 157 1 or 158 1
Q & A / Re: sunn 250watt stagemyster
« Last post by lurkanddestroy on December 19, 2022, 02:55:18 am »
Could you email me a copy of the scematic for that footswitch? My bass player(who plays guitar in another band) needs a footswitch for his Sunn Stagemaster(which I traded him for a Sunn Concert Bass head and 2X15s cabinet). I think I got a pretty good deal out of it. What do you think? L8r, Kevin

hello Kevin,
did you finally get your hands on a schematic for that footswitch?
Q & A / Re: ENFORCER/predator A/B foot Switch?
« Last post by lurkanddestroy on December 19, 2022, 02:51:27 am »
so is the footswitch for the Enforcer going to work for the Stagemaster as well?
I am not an eletronics expert but I want to diy a footswitch for a friend's combo Stagemaster and give it to him as an xmas present.

I seem to find online the instructions for building an Enforcer footswitch but not for Stagemaster.

Any help/advice would be greately appreciated.
General Discussion / Re: How to create a topic at ??
« Last post by EdBass on November 25, 2022, 01:31:05 pm »
Does the process you used to create this topic not work on other parts of the forum?
General Discussion / How to create a topic at ??
« Last post by Svetlegk on November 22, 2022, 06:24:30 am »
 Can anyone help ??
 I can't write to the topic.
 Yours faithfully.
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