Putting effect loop in ceriatone Jcm 800

populartsl · Post by **populartsl** » Thu 04/26/07 4:55 pm

Can any one give me any pointers on doing this.

Cheers Ben

s2 · Post by s2 » Thu 04/26/07 6:36 pm

Check out the Jubilee schematic. I just used that exact loop in a Plexi and worked perfectly. I placed it between the treble pot and PI.

Here's a pic...

candh · Post by **candh** » Thu 04/26/07 6:37 pm

There is a cheap and very effective way but I really can't post it on the forum. PM me at candhh@yahoo.com.

PS.. I am not a seller just a satisfied customer of a very decent product by a former member of the 18 watt community.

candh

populartsl · Post by **populartsl** » Fri 04/27/07 3:32 am

Thanks guys for info

Gonna have look into it

Ben

paulster · Post by **paulster** » Fri 04/27/07 3:46 am

The FX loop card as used in the JCM800 and 1959 reissue should be pretty easy to build on stripboard if you wanted to go that route as well.

It uses an op-amp driver

but has the advantage of switchable levels between rack-mount (+4dBV) and pedal level (-10dBV), and a very low output impedance so it's good for driving cable runs back to your pedalboard if needed.

I've just built a Jubilee loop and it's nice and straightforward but it's not nearly as flexible and the output impedance could really be lower.

A number of people who have swapped out their PCBs to Metroamp (or similar) PTP boards in their plexis have kept the loop card as it's purported to be pretty transparent.

You might even snag one on eBay as people who replace their PCBs don't always think about keeping the loop card and some have been sold off.

LooseChange · Post by **LooseChange** » Fri 04/27/07 6:09 am

Take a look at the schematic I have posted on this page. It an all tube parallel loop. It's completely transparent. You'll need an extra tube.
http://loosechange.freeservers.com/photo_1.html

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Putting effect loop in ceriatone Jcm 800

Putting effect loop in ceriatone Jcm 800