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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)
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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
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.
« 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....


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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