Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on November 18, 2016, 05:12:33 am

Title: Ideas for layout on JCM800 2204 combo transformers and tubes anyone?
Post by: Oddvar on November 18, 2016, 05:12:33 am

Hi again.

I was wondering if anyone had any ideas on the best way to layout the transformers, tubes and electrolytics on a Marshall JCM800 combo, one twelve inch speaker?  Up til now, on other builds, I have just put them where the place allowed, but maybe there is a better plan somewher?

Title: Re: Ideas for layout on JCM800 2204 combo transformers and tubes anyone?
Post by: sluckey on November 18, 2016, 07:24:58 am

Look at these pics...

https://www.flickr.com/photos/137947485@N03/sets/72157671608435446 (https://www.flickr.com/photos/137947485@N03/sets/72157671608435446)

Title: Re: Ideas for layout on JCM800 2204 combo transformers and tubes anyone?
Post by: Oddvar on November 18, 2016, 07:29:15 am

Great tip, jusrt what I need...

Title: Re: Ideas for layout on JCM800 2204 combo transformers and tubes anyone?
Post by: Oddvar on November 18, 2016, 12:57:39 pm

Is there any real need for the bells on the power transformer?  I many of builds have it sunken into the chassis.  I am a bit worried the weight might tilt downwards if sticking out to long, since it's a combo and the chassis is secured only to the backplate?

And is the biasing on the back done in some special way, hardwarewise?