JCM 900 bias pot

[VMGravy]

Not too sure here so a little help would be greatly appreciated.
Is this little donut looking thing the bias pot for this amp???

[surfnorthwest]

Take a look at the video link below, shows a JCM 800 being biased. The 900 is similar. DON'T FRY YOUR ASS


http://www.eurotubes.com/video/Generic-Bias.wmv

[TonyC]

I don't know but doesn't the BIAS trim pot in Marshalls look more like this:




Perhaps you can read something out from these

http://www.drtube.com/marshall.htm#JCM900

[VMGravy]

I don't know but doesn't the BIAS trim pot in Marshalls look more like this:




Perhaps you can read something out from these

http://www.drtube.com/marshall.htm#JCM900

Ya man thats what i thot too, but in the video surf put up i could swear the bias pot looked like the one in my amp.

[surfnorthwest]

The one in the video on the 800 will be the same as your 900 amp. Unless you have a model of a 900 where the bias pot location was moved