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View Full Version : JCM 900 Question


Vaachek
04-13-2008, 10:49 AM
Hey,
I have a cpl heads needing work, and I have a couple questions. First, can anyone recommend a good tech to do the repairs in the Chicago/Joliet area, with a phone number if possible. Second, I have a Marshall model 4100, a 5881 based amp that I know has a bad power tube. I would like to know if it is possible to use KT66 tubes in it. I'm not sure if the amp can accomodate the actual size of the larger bottles, and also, the amp has a 1/2 power switch that goes from pentode to triode (I think) and I'm not sure if the KT66 are compatible with this.
As always, thanks for taking the time to read and reply, and for sharing your wisdom!

rob2001
04-13-2008, 11:06 AM
There was a thread a while back with Chicago tech's needed for a marshall. Try a search for tech chicago.

Groovey Records
04-13-2008, 11:06 AM
http://www.thegearpage.net/board/showthread.php?t=352454&highlight=chicago

here you go

Vaachek
04-13-2008, 12:31 PM
TY for the tech info, anyone know about my 4100 & KT-66's?

rickbob
04-13-2008, 02:34 PM
I doubt if there is room in there to fit the KT66's (I've re-tubed a 4100 several times)...don't know about the technical aspects of whether they'd work IF they did fit.