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91
Q & A / Re: Help with Sunn concert bass
« Last post by Isaac on April 17, 2023, 11:12:41 am »
400w sounds high to me.

The original Concert Bass amp was 150w into 4 ohms. The next generation was rated at 2 ohms, but some knowledgeable people have advised against running it at 2 ohms. As you mentioned 2 ohms, I'm assuming that you have the newer (late 70s) version. Figure 200w at 4 ohms, not much more at 2 ohms. I wouldn't risk it.

For myself, I'd run one 4 ohm cabinet or two 8 ohm cabs.

As for the Celestion K15T, this conversation on TalkBass doesn't speak highly of it: https://www.talkbass.com/threads/celestion-speaker-specs.607781/
92
Q & A / Help with Sunn concert bass
« Last post by Oliv on April 17, 2023, 07:31:31 am »
Hi,
I am new here !
I have a Sunn Concert Bass head (red knobs), and have several questions.

The seller told me it runs 400 watts with 2 ohms, and I read this somewhere on the web, but I mostly read that it is 200 with 4 ohms and 160 with 8 ohms? Is it right ?

I used an ampeg cab with celestion k15t 100 - 4 ohms. Was it a good match, technically speaking (ohms, RMS etc) ?
I think the sound was too mid and not low enough.

I am looking for another 1x15 cab. What would fit with the concert head ?
I play bass (rock / metal) and am looking for something punchy with low frequencies.

Thanks a lot for your help !! :)
93
Q & A / Re: New to the group, question about Beta Lead output problem
« Last post by loudthud on April 16, 2023, 07:18:48 pm »
On the back of your amp, find a jack marked "Power Amp Line In". Plug you guitar in there. You should get some low level sound through the speakers if they are properly connected to the amp. There are two more jacks marked "From Accessory". Those should work the same. These jacks have switch contacts that send the signal through when nothing is plugged in. The contacts become corroded when not used. Inserting a plug several times will usually "wake up" or refresh the switch contacts. A small amount of contact cleaner could be used, but you would have to open the amp to apply it properly.

To avoid this problem you would need short patch cables like the ones used on a pedal board and connect from the "To Accessory" to the "From Accessory" jacks or from the "Master Line Out" to the "Power Amp Line In" jacks.
94
Q & A / New to the group, question about Beta Lead output problem
« Last post by engineco16 on April 16, 2023, 03:19:58 pm »
I'm new to the group. I've had my Sunn Beta Lead since 1978 and I recently started playing again. I've been building a new pedalboard and the other day I had the amp on a clean setting and I was getting a little breaking up, this is where I screw up. So I decided to check the 45 year old speaker for any resistance and my finger goes thru the paper. Not the end of the world so I bought two news Celestion Seventy 80 8 ohm speakers, awesome! Not so much, I clean everything up, put the amp back into its enclosure, connect the speakers, no sound. I tried everything I could think of, nothing, but the speakers work when I plugged them into another amp. So I'm lost right now, can I connect alligator clips to an output jack and connect another speaker, or how can I tell if the amp is working. Thanks in advance.
95
DIY / Model T like front grill material
« Last post by Beedoola on April 15, 2023, 12:03:56 pm »
I have a Hot rodded Marshall amp I built and I love the look of the old Model Ts with that cool grill. Anyone know of a place to get a similar aesthetic metal material? I've looked up some expanded metal/decorative expanded metal but I can't find anything I like as much.



96
Q & A / Re: Does anyone have a Sunn Alpha 210r schematic?
« Last post by andromerthikal_berth on April 05, 2023, 05:36:11 am »
Quote from: fubusmaximus on March 30, 2023, 04:07:02 pm
Does anyone have a Sunn Alpha 210r schematic?

You may find this page a little helpful in your journeys as well:

https://el34world.com/charts/Schematics/files/Sunn/Sunn_Schematics.htm
97
Q & A / Re: Does anyone have a Sunn Alpha 210r schematic?
« Last post by loudthud on March 31, 2023, 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.
98
Q & A / Does anyone have a Sunn Alpha 210r schematic?
« Last post by fubusmaximus on March 30, 2023, 04:07:02 pm »
Does anyone have a Sunn Alpha 210r schematic?
99
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.
100
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 
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