Yes but the fets (TO-3's) are metal encased, which is a heatsink in itself...thus the reason why they are considered superior. In all the equipment I work on at work, the TO-3's are pressed into the heat sink on the underside to aid in cooling, I would be willing to bet those are the same. [img]smile.gif[/img]

Oh and by the way, your amp looks spectacular, good job!

[ June 24, 2003, 10:36 AM: Message edited by: kilowatt ]

 

Speaking of the power supply transistors..

Now I know people like Mmats amps and for sure they make a good amp but the minute I see a manufacturer using the hole in the transistor tab as a hold down I have to shudder.

Motorola says don't do that - the hole is there for handling only.

 

kilo if you look at the pick you will see a white ring around the to-3 casing and the power supply transistors have a tan colored insulator
usually all transistors are insulated
because the casing or tab have power to it
if they were allowed to make contact to the heatsink it would never turn on or if it did not for very long </font>[/QUOTE]Pinhead-The screws holding down the fets are screwed directly to the heatsink!! [img]graemlins/freak.gif[/img]

 

I have 2 amps sitting in front of me, a PPI and an MTX, both have the transistors screwed directly to the heatsink with a dab of heatsink grease under them (also on your Matts amp under the copper piece). If I can find somewhere to host the pics I will post them.

 

And here is a post with pics of the transitors mounted directly to the circut board with a little heatsink grease.


http://www.canadiancaraudio.com/cgi/...=006245#000002