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Recent Posts

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Q & A / Re: Sunn Beta Bass Repairs
« Last post by loudthud on October 18, 2021, 07:52:37 pm »
Regretfully, your chances of finding an exact replacement for the pot and knob are not very good. Your best shot is to find a broken Beta Bass or Beta Lead that is being scrapped for parts. You can find a pot that will work electrically, but you will have to improvise the mechanical mounting and then find a knob that will fit the shaft.
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Q & A / Sunn Beta Bass Repairs
« Last post by yoonzoo on October 16, 2021, 12:41:22 am »
Hello guys, I got a Sunn Beta Bass but it need to change the potentiometer and knob.
I bought a product with broken shaft and it need repair.
Can I get a product with the same performance that was used in the Sunn Beta Bass?
Or should I just buy the most similar one? If you know about parts, please reply for me :)
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Classified / Re: SH215
« Last post by claytoy on October 09, 2021, 05:15:05 pm »
They are still available
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Q & A / Re: Sunn Concert Slave Question
« Last post by Isaac on September 01, 2021, 09:15:28 am »
Certainly possible. "Thin" is not normal for a Concert Slave.
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Q & A / Re: Sunn Concert Slave Question
« Last post by Mosthigh on August 31, 2021, 06:00:26 pm »
Thanks for the reply. I don't think the issue is the preamp, because when I do turn the volume all the way up on the Sunn and the Alembic, it just doesn't seem to be putting out the power that it should, and sounds thin. I did plug in a SWR Interstellar Overdrive pre, which has a 5w amp, but the result was similar (although it is in need of tubes change). I think the Sunn has power supply issues.
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Q & A / Re: Sunn Concert Slave Question
« Last post by Isaac on August 31, 2021, 05:00:05 pm »
Okay, I misread the Alembic text. The effects loop is unity gain. The text implies that the preamp as a whole has positive gain, but never says how much, nor what its maximum output is. So maybe it has enough gain to drive the Concert Slave, or maybe not. But why not turn the Sunn's volume control all the way up, and control the volume with the Alembic? The only real reason for the CS having a volume control on it at all is to turn down an input that is too hot, to keep from overdriving the slave. Doesn't sound as though that's a problem with the Alembic.
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Q & A / Re: Sunn Concert Slave Question
« Last post by Isaac on August 31, 2021, 11:52:15 am »
He may well be right.

According to Alembic's website*, the F-1X is a unity gain preamp. In other words, the signal out is no stronger than the signal you put in, so it's like plugging your instrument straight into the slave amp. A guitar can't generate enough voltage to properly drive a power amp, and a power amp such as the Concert Slave isn't designed to have enough gain to amplify such a low level signal.

What other gear do you have access to that could function as a preamp? That's where I'd start.

*http://www.alembic.com/prod/f1x.html
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Q & A / Sunn Concert Slave Question
« Last post by Mosthigh on August 30, 2021, 09:47:55 pm »
Hello, I recently bought an early 70's Sunn Concert Slave secondhand. When I plugged it in with my Alembic F-1X preamp and 15' speaker, it seemed to have a real lack of power, and a certain crackle I attribute to a dirty volume pot. I did clean the pot several times, but I still only get volume after I turn it to noon, or 2V, on the dial, it doesn't go very loud, and sounds 'fizzy'. I took it to a questionable electronics repair guy, and he says it needs a preamp or a equalizer to boost the input levels. Since the Alembic pre has no wattage of its own, I find this an inconclusive assessment, but I'm not an expert. Thoughts?
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Classified / SH215
« Last post by claytoy on August 29, 2021, 04:33:46 pm »
I'm thinking to get rid of these... speakers have square magnets.   I'm thinking 450 a piece.. I'm in Southern California.
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Q & A / Re: I know I'm doing something wrong with my concert head
« Last post by Isaac on August 28, 2021, 08:53:54 am »
Unless you happen to have a Concert Slave, as I do!

That's just a Concert series power amp with an input volume control on the front.
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