Help: MOD for JCM800 Emul

6l6gc · July 02, 2005, 01:48:36 AM

Hi, everyone

I have a question.

I just maked 'JCM800 Emul (by electrictabs)'.

Can I adopt 'Marshall amp Mods by SCHEMATICHEAVEN.COM' to the 'JCM800 emul'?

https://schematicheavencom.secure.powweb.com/ampmodheaven.htm

please let me know :cry:

thanks..

Arno van der Heijden · July 02, 2005, 05:51:51 AM

Sure!
Although some mods might be less effective than others, since were dealing with just an emulator here.
Try and find out! Don't forget to report here!

6l6gc · July 02, 2005, 11:20:28 AM

Yes, Sir ! :wink:

vanhansen · July 02, 2005, 11:29:34 AM

Hey, another happy builder.

I have some mods listed here:
http://www.erikhansen.net/diy/jcm800emu.htm

Some of them are from Schematic Heaven.

6l6gc · July 02, 2005, 02:06:41 PM

Thanks, vanhansen! :lol:
I knew your great web already.
It's real cool!

and...

How can I remove the tone stack entirely?
Just connect 'Q4 source (4th J201)' to the 'Master Volume(1M)'?

vanhansen · July 02, 2005, 02:20:14 PM

Quote from: 6l6gcHow can I remove the tone stack entirely?
Just connect 'Q4 source (4th J201)' to the 'Master Volume(1M)'?

Actually it would be the gate of Q3 to the Master Volume. Q4 is what drives the tone stack. On the PCB layout, you can use the Q3 source pad to run a wire to the Master Volume if you omit all the tone stack parts.

jimbob · July 02, 2005, 02:29:28 PM

great site!

6l6gc · July 02, 2005, 02:53:42 PM

Wire SOURCE of Q3 to the master volume...?
Not a DRAIN ??

vanhansen · July 02, 2005, 04:59:23 PM

Quote from: 6l6gcWire SOURCE of Q3 to the master volume...?
Not a DRAIN ??

Oh crap...my bad :oops: I meant to say DRAIN....LOL, not gate. So yes, the Drain of Q3 to the Master Volume.

If you look at the parts layout, there is a pad right next to the drain of Q3 that connected to the Gate of Q4. Use Q4's gate hole to run a wire to the Master Volume from the Drain of Q3. Makes sense?

6l6gc · July 03, 2005, 01:20:40 AM

Yeah! I got it! Thanks :lol:

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Help: MOD for JCM800 Emul