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i have used 455, 453, sd1446, srf3749 (mrf454) as drop in replacements,
in order of preferance,
srf3749 or mrf454's same thing different badge,
sd1446
mrf453
mrf455

when replacing transistors you should countersink/deburr the screw holes to make sure the transistors sit flat to the heatsink, virtually all rm and zetagi amps will have raised edges/distortion around the holes that needs fixing,

when using used transistors its important to make sure the tabs are not bent like mack describes,
often re-used devices are bent and won't touch the sink where they should even when you make the heatsink flat,

you can lap the tabs in with fine emery paper on plate glass.

use good thermal paste and apply VERY sparingly, you are not buttering bread.

[QUOTE="bob85, post: 357187, member: 18"] i have used 455, 453, sd1446, srf3749 (mrf454) as drop in replacements, in order of preferance, srf3749 or mrf454's same thing different badge, sd1446 mrf453 mrf455 when replacing transistors you should countersink/deburr the screw holes to make sure the transistors sit flat to the heatsink, virtually all rm and zetagi amps will have raised edges/distortion around the holes that needs fixing, when using used transistors its important to make sure the tabs are not bent like mack describes, often re-used devices are bent and won't touch the sink where they should even when you make the heatsink flat, you can lap the tabs in with fine emery paper on plate glass. use good thermal paste and apply VERY sparingly, you are not buttering bread. [/QUOTE]

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