Home » VintageKustom.com » Replacement Part Suggestions » 3055 vs 3771 power transistors (transistors)
3055 vs 3771 power transistors [message #27519] Sat, 28 September 2019 17:42 Go to next message
doc10039 is currently offline  doc10039
Messages: 7
Registered: March 2012
Location: Arizona
Junior Member
I am wanting to change power tranistors is my K200 B1. Which one would be the best the 3055 is 15a and the 3771 is 30a what difference would this make between the two. thanks
Re: 3055 vs 3771 power transistors [message #27522 is a reply to message #27519] Sun, 29 September 2019 14:45 Go to previous messageGo to next message
chicagobill
Messages: 1935
Registered: April 2003
Senior Member
The main difference between the two transistors are power and voltage ratings.
The 2N3055 is rated at 60 volts and 15 amps.
The 2N3771 is rated at 40 volts and 30 amps.

The 2N3771 transistor is rated for 40 volts which is low for use in your Kustom amp.

If you want to replace yours there are better rated transistors that you can use. Why do you need to replace yours?
Re: 3055 vs 3771 power transistors [message #27523 is a reply to message #27519] Mon, 30 September 2019 10:45 Go to previous messageGo to next message
doc10039 is currently offline  doc10039
Messages: 7
Registered: March 2012
Location: Arizona
Junior Member
Due to age of amp mostly. Also the chassis was pretty dirty almost like dirt and oil kinda sticky. I have cleaned the bottom of the chassis and some wires with simple green and a brush. I am wanting to de-funk the boards and the rest that I can't get to. Any chemicals you recommend? Thanks
Re: 3055 vs 3771 power transistors [message #27524 is a reply to message #27519] Mon, 30 September 2019 12:42 Go to previous messageGo to next message
chicagobill
Messages: 1935
Registered: April 2003
Senior Member
Been there, done that. I've seen amps that have sat in restaurants for years that have a horrible goo made up of food grease and dust. Worst yet are any power amps with ventilation fans that suck that grease right in.

Lately I've been using a dollar store cleaner with the Amazing or Awesome brand name. Anything that will cut through the grease film is good. Just try and keep it off of the pc boards and components.

Re: 3055 vs 3771 power transistors [message #27525 is a reply to message #27524] Mon, 30 September 2019 14:19 Go to previous message
thetragichero is currently offline  thetragichero
Messages: 31
Registered: April 2019
Member
so unless you have decades old power transistors to replace the current ones, my experience is that the new production (of you can get ones that aren't fakes) 2n3055s are not nearly as rugged as the old ones. if you've got an amp that works and is filthy, clean it up and play (converting tho 3 prong power cord and removing the death cap is okay though)
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