Bugera 15v regulators vs heat

[drewl]

So apparently this is a common problem.
The plus/minus 15v regulators get very hot.
Especially the plus 15 which is right next to 5w dropping resistors.

Then the regulator dies.

I heat sinked them and it is fine even after several hours, but very hot.

If I put a heat gun on it it craps out.

Is that overkill as far as testing?

Other than a fan any other ideas?

[TimmyP1955]

You may have to move them to the chassis so the heat has a lot more metal to warm up. They'll have to be isolated of course.

[The Dude]

Are they the TO-220 type (7815 &7915)? One thing I've discovered in the past is that not all of these devices are the same. If you look at specs, some are rated higher current and/or higher temp. I'll link a Digikey search I just did. Notice that some are rated at 1A and some at 1.5A. Also note the temp ratings. Depending on what's in your amp, you may be able to improve reliability by using a higher rated regulator.

PMIC - Voltage Regulators - Linear | Integrated Circuits (ICs) | DigiKey

[drewl]

They are KIA7815IP, TO220 with insulated center pin.
The all coated version.
Supposedly good for 1.5A

The only ones I have are lower current.

Smart idea mounting them to the chassis.
All this can come later, kid wants to be able to make it through gig tomorrow.

[Steve A.]

Just wondering which Bugera amp this is... a friend really likes the traditional and modern blues tones from the V22 Infinium combo amp. He had one which he exchanged at GC towards a V55 Infinium which he exchanged for a newer V22 Infinium. Funny thing is that with the first V22 the Presence control was in the preamp but was in the power amp section of the power amp (he discovered that plugging directly into power amp.)

Steve Ahola

[drewl]

This one is a head, matches the schematic I had dated:
20.11 8
12:29

Whatever that means.

Date copied exactly as it appears on schematics.