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New OP-AMP for Music Man HD-130 bass amp


Kevin McCready
Posted on Sunday, July 28, 2002 - 08:23 pm:   

This is the second time I have posted a message. The first one was lost for some reason. I need a replacement for the LM 307H in my M.M. HD 130. Can anyone help.
Posted on Tuesday, July 30, 2002 - 07:21 am:   

Kevin I can help with the LM307. Email me at: dickbillups@hotmail.com
Posted on Monday, August 05, 2002 - 09:11 am:   

I'm gonna let the cat out of the bag. I respectfully ask that we don't buy them all up. We don't want them to become extinct. These guys say they have found lots of them.
We can get the original LM307H at Lakeview Electronics, 1054 Pioneer
Road, Crafton WI 53024 phone # 262 377 8250. They are $12.50 each and if we
are careful they will last for those of us who regularly work om MM amps. Maybe only buy no more than 10 at a time? PLEASE, I can't stress enough how important it is that we don't blow it on this one.
Dick Billups.
Kevin McCready
Posted on Tuesday, August 06, 2002 - 08:51 pm:   

I have been talking with an applications engineer from Texas Instruments and have found a replacement for the LM307H that just blows it away in every catagory of performence. The T.I. chip has much beter slew rate,frequency response,DC offset,current draw,you name it. The only problem is that the metal can package is now obsolete by every manufacture.The pin out of each is identical,a good thing.I am investigating a way to hand wire a dip header for the T.I. chip to the round base of the LM307. The T.I chip is about 2.50-3.00 and a 8 pin dip header is about 2.00-2.50. By the way the LM307H sold for about $1.85 before it was obsoleted.Wow,I wonder why it is 12.50 each now. Maybe for its now a collectors item. Only tube artifacts sound better than new products. I think I will try to use the new op-amp rather than pay the extortion of $12.50!
Posted on Wednesday, August 07, 2002 - 11:19 am:   

Great news! I hope it sounds good. It would be easy to make an adapter for it. The 307 may be left to the 100% restorations. Let us know how it turns out.
Dick Billups
Kevin McCready
Posted on Saturday, September 07, 2002 - 08:00 am:   

I have more information and questions on HD130 bass amp in the circuit modification section.
Posted on Friday, September 27, 2002 - 05:39 am:   

The LM307H (and other versions, such as LM107N/883) are listed as in stock at

Price not listed.

Posted on Monday, May 03, 2004 - 07:45 pm:   

what is the LM307H and what function does it perform in my 212-HD 130?
Posted on Thursday, May 06, 2004 - 08:25 am:   

LM307H is an op-amp IC. (It's out of production.)
Think of it as 1/2 of a 12AX7 pre-amp tube.