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Discussion Forum for Mesa Boogie Products
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PostPosted: Sat Jan 29, 2011 11:39 am 
Bottle Rocket

Joined: Sat Jan 29, 2011 11:00 am
Posts: 1
Hi Boogie Board.
This is my first post so I don't know if it's alright to ask this question or not...
I have a 1978/80 head 100/60 watt, serial number 4***, finished in white. It has a small valve substitute item held in place by a plastic ring with "TRI009" and 7737 stamped on it. I believe it is an early solid state alternative to the rectifier tube....Anyone know what it's used for?
If I wanted to insure this amp. what is it worth or how much to replace it?
I would upload photos but I haven't figured it out yet.
Jim Cregan

PostPosted: Sat Mar 12, 2011 5:17 pm 
Donating Member

Joined: Fri May 14, 2010 2:00 am
Posts: 1048
Location: Chicago
Hey Jim,


As far as worth, hard to say exactly, but for insurance I'd say $1200. try and get full replacement value for the insurance. But if you were going to sell it, maybe $550 to $800 range. That little semiconductor is a Fetron. they used it in place of a 12ax7 to avoid microphonic tubes, but the fetrons don't sound great, so mesa dropped them with the late IIA /IIB models. You can mod your amp to add a 12ax7 and replace the fetron. Ibelieve the mark V is the only mark series to use a tube rectifier... the rest use solid state... diodes i think.

If you want to upload pics, you need a web hosting site like photobucket. just copy and paste the "IMG" code to this board from your hosting site. the pics will stay up as long as you have a paid membership to photobucket or whichever site you use.

check out the vintage amp section... a wealth of info.


Mark IIC+ KDG "Road Head"
Mesa 2:90
Digitech GSP2101
ESP JH-2 Explorer
LTD Explorer
Ibanez S-540
Boogie 1x12 Thiele, 1x12 Compact Cab
Boogie 4x12 Cream Halfback

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