Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on May 19, 2022, 04:52:15 pm

Title: jcm800 2204 line out ckt
Post by: fossilshark on May 19, 2022, 04:52:15 pm

Hi all, back again for my yearly post  :laugh:

The jcm800 2204 clone I built sounds killer! I am just wondering about the line out ckt that is shown in some schematics like this one. Is it safe to use with modern PA systems/mixers? I want to build it off the 16ohm tap instead of the 8ohm because I am almost always plugged into the 8ohm (just makes more sense to draw off an unused output right?) would I have to modify any component values?

any input is appreciated  :icon_biggrin:

Title: Re: jcm800 2204 line out ckt
Post by: tubeswell on May 19, 2022, 05:00:29 pm

Having a line-out like that is fine, but its not a substitute for a load. I.e. keep your speakers plugged in

Title: Re: jcm800 2204 line out ckt
Post by: PRR on May 19, 2022, 05:05:42 pm

> makes more sense to draw off an unused output right?

I don't see why.

Title: Re: jcm800 2204 line out ckt
Post by: fossilshark on May 19, 2022, 06:28:56 pm

good point, my thinking wasn't based on anything at all really lol. Thanks for the response as always! I will be implementing this tonight.

Title: Re: jcm800 2204 line out ckt
Post by: pdf64 on May 20, 2022, 04:06:01 am

The tone will be buzzy, nothing like a miked speaker, unless the signal is passed via speaker emulation or an IR processor.

Title: Re: jcm800 2204 line out ckt
Post by: thetragichero on May 20, 2022, 07:13:17 am

definitely some sort of cab sim is needed for it to sound good