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FDP Forum / Amp Mods, Repairs, and Projects / Power resistor question

Elmo66
Contributing Member
*********

Midwest USA

Jan 17th, 2017 08:41 AM   Edit   Profile   Print Topic   Search Topic

I'm repairing my first transistor Unicord bass amp and have a resistor value question. The value printed on the resistor is 0.27K. I'm assuming this means 270 ohms?

Also, the schematic lists this power resistor at 3 watts, but this one is 5 watts? PW5 = 5 watts, right?

The suspect

ECS-3
Contributing Member
**********
*

USA / Virginia

Jan 17th, 2017 11:55 AM   Edit   Profile   Print Topic   Search Topic

Yea that's 0.27K = 270 ohms, 5 watt wire wound resistor.

Elmo66
Contributing Member
*********

Midwest USA

Jan 17th, 2017 03:07 PM   Edit   Profile   Print Topic   Search Topic

Excellent! Thank you.

This amp has been in my parent's basement since it blew in 1984 at a party. When that happened, I moved over to guitar and so this amp has sat since. I finally (somewhat) have enough knowledge to get it back running.

Peegoo
Contributing Member
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**********
******

The spotlight

looks like a prison break
Jan 18th, 2017 12:08 AM   Edit   Profile   Print Topic   Search Topic

Good that you're replacing it.

That "FU" on there means that resistor has a bad attitude and will be unreliable on the job.

:o)

Elmo66
Contributing Member
*********

Midwest USA

Jan 18th, 2017 07:08 AM   Edit   Profile   Print Topic   Search Topic

That "FU" and his twin brother are both reading wide open on the meter and are probably responsible for taking out the original power transistors which are made of unobtainium. I've since sourced suitable replacements.

willie
Contributing Member
*******

Too Near Atlanta GA

Amp Tech Emeritus
Jan 18th, 2017 10:11 AM   Edit   Profile   Print Topic   Search Topic

..or, the power transistors shorted and took out the resistors... :)

w

Elmo66
Contributing Member
*********

Midwest USA

Jan 18th, 2017 11:45 AM   Edit   Profile   Print Topic   Search Topic

...and they both ganged up to take out one of the driver transistors...

Pinetree
Moderator Emeritus
(with many stars)

NW Pennsylvania

Jan 18th, 2017 02:18 PM   Edit   Profile   Print Topic   Search Topic

"The Bad Resistors"





Peegoo
Contributing Member
**********
**********
******

The spotlight

looks like a prison break
Jan 18th, 2017 03:02 PM   Edit   Profile   Print Topic   Search Topic

WOOT!

Band Name Alert!

ECS-3
Contributing Member
**********
*

USA / Virginia

Jan 21st, 2017 10:50 AM   Edit   Profile   Print Topic   Search Topic

"The Bad Resistors"

You don't want to meet them in a dark alley.

FDP Forum / Amp Mods, Repairs, and Projects / Power resistor question




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