need replacement amp for M&K Volkswoofer

benhumphries · 4th October 2010, 02:35 AM

I have a M&K Volkswoofer I bought in 1978. It was one of the first powered subwoofers on the market.The driver is in good shape, but the amp is blown. I would like to keep it vintage and have been looking on e-BAY, but nothing has shown up.

The driver has two 4 ohm coils. It is in good shape, I had the foam surround replace 15 years ago. Sounds good if you power it directly. I also measured voltage on the power supply output wires. The amp is some kind of oversized IC maybe, providing output seperatly to each of the voice coils. As I rememeber it, the amp output was about 70 watts.

The one thing I have seen is MCM Audio Select 100 Watt Subwoofer Amplifier Module | 50-6272 (506272) | MCM Audio Select It is a 100 watt plate amp. It has a single output. I assume that I can wire the two voice coils in series and connect it to the single output. + to - to + to -.

Can anyone suggest other replacements?

dangus · 4th October 2010, 07:05 AM

Some of those hybrid amp modules will still be available. What's the number on the chips? Does it start with STK?

Maybe a couple of LM3886 chipamps could reuse the original power supply and heatsinks. Or a higher power chipamp like the Sanyo STK404 family.

In a pinch, you could just run it from a random stereo receiver or integrated amp from the thrift store. Or pick up a used (semi)pro amp; something that does 100w/4ohms should be cheap.

Ron E · 4th October 2010, 11:18 PM

look at apexjr, they have a number of M&K modules.

Apex Jr · 5th October 2010, 12:48 AM

This is the only amp left in M&K. Rest sold out

MnK Amp

Steve

benhumphries · 5th October 2010, 01:51 AM

The chip amp is a Sanken SI-1050GL.

I did find a SI-1050G. Do you know if it is close enough?

Spent 20 min on Google and couldn't find any data sheets.

For $35 it might be worth a try.

Thanks for the tips

benhumphries · 6th October 2010, 11:06 PM

Bought the SI-1050G on e-bay for $30. Actually 2, just in case.

The seller said that the G could sub for the GL, but not vise versa.

I will let you know how it sounds.

Thanks again, in the back of my mind, I thought I should be looking for the chip but assumed that the amp was too old and wouldn't be able to find it.

4th October 2010, 02:35 AM	#1
benhumphries diyAudio Member Join Date: Oct 2010 Location: Orlando	need replacement amp for M&K Volkswoofer I have a M&K Volkswoofer I bought in 1978. It was one of the first powered subwoofers on the market.The driver is in good shape, but the amp is blown. I would like to keep it vintage and have been looking on e-BAY, but nothing has shown up. The driver has two 4 ohm coils. It is in good shape, I had the foam surround replace 15 years ago. Sounds good if you power it directly. I also measured voltage on the power supply output wires. The amp is some kind of oversized IC maybe, providing output seperatly to each of the voice coils. As I rememeber it, the amp output was about 70 watts. The one thing I have seen is MCM Audio Select 100 Watt Subwoofer Amplifier Module \| 50-6272 (506272) \| MCM Audio Select It is a 100 watt plate amp. It has a single output. I assume that I can wire the two voice coils in series and connect it to the single output. + to - to + to -. Can anyone suggest other replacements?

4th October 2010, 11:18 PM	#3
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	look at apexjr, they have a number of M&K modules. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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4th October 2010, 07:05 AM	#2
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	Some of those hybrid amp modules will still be available. What's the number on the chips? Does it start with STK? Maybe a couple of LM3886 chipamps could reuse the original power supply and heatsinks. Or a higher power chipamp like the Sanyo STK404 family. In a pinch, you could just run it from a random stereo receiver or integrated amp from the thrift store. Or pick up a used (semi)pro amp; something that does 100w/4ohms should be cheap.

5th October 2010, 12:48 AM	#4
Apex Jr diyAudio Member Join Date: Jun 2002 Location: Torrance, Calif	This is the only amp left in M&K. Rest sold out MnK Amp Steve

5th October 2010, 01:51 AM	#5
benhumphries diyAudio Member Join Date: Oct 2010 Location: Orlando	The chip amp is a Sanken SI-1050GL. I did find a SI-1050G. Do you know if it is close enough? Spent 20 min on Google and couldn't find any data sheets. For $35 it might be worth a try. Thanks for the tips

6th October 2010, 11:06 PM	#6
benhumphries diyAudio Member Join Date: Oct 2010 Location: Orlando	Bought the SI-1050G on e-bay for $30. Actually 2, just in case. The seller said that the G could sub for the GL, but not vise versa. I will let you know how it sounds. Thanks again, in the back of my mind, I thought I should be looking for the chip but assumed that the amp was too old and wouldn't be able to find it.

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