Electro-Harmonix Freedom Amp schematic.

thomj513 · 10th July 2009, 10:26 PM

I'm looking for a copy of the schematic for the old (mid 70's ???) Mike Matthews "Freedom Amp" that Electro-Harmonix used to make. Almost bought one way back when but didn't. Now I'm thinking of building one for my own amusement. I know, it's not a good as some of the newer amps but it's a "nostalgia" thing for me. Thx in advance, Thom.

Enzo · 10th July 2009, 10:36 PM

Did you contact ElectroHarmonix and ask?

scottnixon · 10th July 2009, 11:02 PM

http://www.ssguitar.com/index.php?to...prev_next=prev

thomj513 · 11th July 2009, 01:19 PM

No. My past experiences with factories is that they don't like to hand out "confidential" information no matter how old it may be.

Nigel Goodwin · 11th July 2009, 08:25 PM

Quote:

Originally posted by thomj513
No. My past experiences with factories is that they don't like to hand out "confidential" information no matter how old it may be.

Many are quite happy to do so, it's always worth asking.

Jarno · 11th July 2009, 09:07 PM

Actually, I think it is not that bad. Good cabinet construction, proper speaker, well designed electronics (albeit a bit quirky), what's not to like?
I think I've seen a schematic somewhere but I don't remember where, have you tries DIYstompboxes.com and freestompboxes.org?
And a lot of companies don't mind these schematics floating around, they realise that:
A. There are not that many people building stuff instead of buying it.
B. It's not THAT cheap to build it yourself
C. Guitar electronics is not rocket science, most of the schematics are not even remotely original
D. Their value add is not in making the same products ad infinitum, it's about continuously evolving and creating new products (something electro harmonix does very well).

Enzo · 13th July 2009, 09:55 PM

The manufacturer's concern is not that someone will clone one in their basement. They are not really worried that some competitor will "steal" their circuits. There is rarely something new in a guitar amp anyway. ANyone who needs a schematic for such nefarious purpose can simply set a technician down at a table with a sample product and have him draw up a schematic from the unit itself.

Their concern is that in a potential patent infringement case against an actual competitor, they wan't to be able to say they made a diligent effort to protect their intellectual property - the technical documentation.

Some companies are extreme - Behringer for example - while other companies are more than happy to send it out of you ask - Peavey for example.

thomj513 · 13th July 2009, 11:14 PM

Thx for the info and encouragment. I'll check-out the stomp-box sites as well as contact EH. TJ.

thomj513 · 14th July 2009, 08:44 PM

Got a reply from Alan Otto at E-H. Attached is a copy, smallish, of the Dirt Roads Special. Looks to be fairly straight-forward in design. Let me know what you think and offer any suggestions to improve it. Thx again, Thom.

teemuk · 16th July 2009, 07:14 PM

The attached image has a size of a postmark.

Are we supposed to be able to read it?

10th July 2009, 10:26 PM	#1
thomj513 diyAudio Member Join Date: Apr 2006 Location: Los Angeles, Ca.	Electro-Harmonix Freedom Amp schematic. I'm looking for a copy of the schematic for the old (mid 70's ???) Mike Matthews "Freedom Amp" that Electro-Harmonix used to make. Almost bought one way back when but didn't. Now I'm thinking of building one for my own amusement. I know, it's not a good as some of the newer amps but it's a "nostalgia" thing for me. Thx in advance, Thom.

11th July 2009, 09:07 PM	#6
Jarno diyAudio Member Join Date: Sep 2002 Location: Rosmalen, The Netherlands	Actually, I think it is not that bad. Good cabinet construction, proper speaker, well designed electronics (albeit a bit quirky), what's not to like? I think I've seen a schematic somewhere but I don't remember where, have you tries DIYstompboxes.com and freestompboxes.org? And a lot of companies don't mind these schematics floating around, they realise that: A. There are not that many people building stuff instead of buying it. B. It's not THAT cheap to build it yourself C. Guitar electronics is not rocket science, most of the schematics are not even remotely original D. Their value add is not in making the same products ad infinitum, it's about continuously evolving and creating new products (something electro harmonix does very well). __________________ Oemptempa petoempetapap

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10th July 2009, 10:36 PM	#2
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Did you contact ElectroHarmonix and ask?

10th July 2009, 11:02 PM	#3
scottnixon diyAudio Member Join Date: Mar 2001 Location: High Point, NC	http://www.ssguitar.com/index.php?to...prev_next=prev

11th July 2009, 01:19 PM	#4
thomj513 diyAudio Member Join Date: Apr 2006 Location: Los Angeles, Ca.	No. My past experiences with factories is that they don't like to hand out "confidential" information no matter how old it may be.

13th July 2009, 09:55 PM	#7
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	The manufacturer's concern is not that someone will clone one in their basement. They are not really worried that some competitor will "steal" their circuits. There is rarely something new in a guitar amp anyway. ANyone who needs a schematic for such nefarious purpose can simply set a technician down at a table with a sample product and have him draw up a schematic from the unit itself. Their concern is that in a potential patent infringement case against an actual competitor, they wan't to be able to say they made a diligent effort to protect their intellectual property - the technical documentation. Some companies are extreme - Behringer for example - while other companies are more than happy to send it out of you ask - Peavey for example.

13th July 2009, 11:14 PM	#8
thomj513 diyAudio Member Join Date: Apr 2006 Location: Los Angeles, Ca.	Thx for the info and encouragment. I'll check-out the stomp-box sites as well as contact EH. TJ.

16th July 2009, 07:14 PM	#10
teemuk diyAudio Member Join Date: Nov 2004 Location: Suomi, Finland	The attached image has a size of a postmark. Are we supposed to be able to read it?

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