Comments on: Burst Caps And Burnt Resistors Found In This Unisound UB75E PA Amplifier

By: Mick Mason

Mick Mason — Fri, 17 Jul 2026 14:55:04 +0000

Great repair, Parasuraman, very interesting indeed . I always enjoy reading your reports and the details of each repair. It makes me laugh when you talk of removing mud wasps from mic ports and other exotic (to me at least !) creatures & insects that have made their way into customers' equipment. I do not come across so many beasts here in the UK, except the odd spider perhaps!!
Thank you, sir, and keep up the great work!!
Mick M, UK

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By: jose armando sanchez valdez

jose armando sanchez valdez — Tue, 14 Jul 2026 15:23:47 +0000

saludos tendra algun curso de manejo del osciloscopio digital en libro en pdf...

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Greetings. Do you happen to have a course on using a digital oscilloscope available as a PDF book?

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By: Parasuraman S

Parasuraman S — Mon, 13 Jul 2026 00:41:51 +0000

In reply to George Persico.

Many thanks for your comments and suggestions! I shall check availability in India!

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By: Parasuraman S

Parasuraman S — Mon, 13 Jul 2026 00:40:53 +0000

In reply to Mark J.

Many thanks, dear Mark!

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By: Parasuraman S

Parasuraman S — Mon, 13 Jul 2026 00:40:16 +0000

In reply to Yogesh Panchal.

Yes, indeed it is! We can get anything done except these! Many thanks, dear Yogesh Bai!

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By: George Persico

George Persico — Sun, 12 Jul 2026 21:29:10 +0000

Just one note. CRC 2-26 is not the best for freeing rusted on knob screws. Get a can of PB Blaster to add to your kit. Will come in handy, especially in wet climates.

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By: Mark J

Mark J — Sun, 12 Jul 2026 19:47:39 +0000

Parasuraman well done on the repair. Thanks for sharing.

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By: Parasuraman S

Parasuraman S — Sun, 12 Jul 2026 10:27:46 +0000

In reply to Albert van Bemmelen.

Yes, the 3055 is a very good transistor and the output also is too good! Many thanks for your comments, dear Albert!

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By: Yogesh Panchal

Yogesh Panchal — Sun, 12 Jul 2026 10:14:17 +0000

Good Job!Sir
Sometimes, during such repairs, it feels like it should simply be repainted properly and handed over, but the challenge lies in highlighting the indicator markings.

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 12 Jul 2026 10:02:37 +0000

It is clear to see that the set was in bad shape with rusts and dirt all over the cabinet, but even that was an understatement LOL!
But you sure made it a much better looking and working pa amplifier!
I am certain that the here used 2N3055 transistors are practically indestructible! Since the 2N3055 is one of the most rugged and historically significant silicon power transistors ever designed!

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