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| | |-+  mixing preamp and power amps sections from different amps
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Author Topic: mixing preamp and power amps sections from different amps  (Read 9411 times)
beatnik
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« on: March 06, 2012, 05:03:12 AM »

Hi guys, It's my first post here! I'm kinda new to valve amplification but I'm starting right now.

I'd like to build a system extremely versatile, mainly for recording purposes.

I need flexibility with the wattage of the power amp, without losing the opportunity of a good sounding pre.

For example, I'd like to use the sound of the JCM preamp, in a Champ power amp!!

I think about using a buffer like the c-lator, which could match the impedances and levels between pre and power sections on different amps.

Do you think that this could work?

Many thanks in advance
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Homesick Hanes
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« Reply #1 on: March 06, 2012, 07:02:47 AM »

If your amps have send & return passive effect loops, you don't need anything. Yu can use the preamp of any amp intp the return of any other amp. I do agree this could yield great results, as I have tried it many times. However, you have to bear in mind that amps 'mojo" doesn't necessarly come from the preamp... I'm not sure by plugging a JCM800 preamp into a Champ power amp you would get a "quiet" marshall platform. A lot of amps characteristic, especially marshalls, is when the POWER section (tubes, OPT & rectifier) are working hard. HOWEVER, this is sure a great thing to try, & we all do that. For exemple, you can use an amp that is preamp oriented (think the OTS dumble clones), into the Champ power section - & there; I agree you might be onto something extremely interesting & versatile.
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wyatt
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« Reply #2 on: March 06, 2012, 04:27:49 PM »

The JCM 800's cathode follower stage (V2B) pretty much takes care of any voltage/impedance issue you would have matching it to a power amp.

So, in this image, the preamp is on top....

http://www.drtube.com/schematics/marshall/jcm800pr.gif

You can take the signal coming of the 'B" at right of that preamp schematic and run that into whatever power amp you want run it into.
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