[RileyD]

I have a +/- 25 year old Rega Brio integrated amp that has been sitting unused for the last 15 years.  Now upon a cold start it outputs a loud POP to the speakers.  It's loud enough I am afraid the pop might damage my speakers.  The pop is not volume control dependent. If I power up from a warm start the pop if diminished, but still apparent.  Functionality and sound quality is fine once the pop is past.

What might be causing this?  Capacitors failing?  Hoping I can find an inexpensive fix.

This amp has a cult following and sells for between $300 and $400.

Thanks

[SET Man]

Hey!

   If the amp had been sitting around that long without use likely those caps are deteriorated, especially electrolytic caps. But if is still work those caps might need to reform. I would open the amp up and check for any leakage of all electrolytic caps just to make sure.

Buddy

[FullRangeMan]

The caps was unused, energy empty for 15 years and suddenly they receive the full load voltage, they may get damaged in this shock.
A very slow soft start should have been made with a Variac

[psycho1122]

Hello,

I recently performed a refurbish on some pre-amplifiers and amplifiers and found that there is a charge capacitor on the time delay relay turn on circuit. This capacitor could be out of specification allowing the relay to turn on in a shorter amount of time before the power supply has finished charging the capacitors thus you hear the POP.

If you have schematics, you could locate this circuit and ID the cap.

Sample simple circuit here...

[Speedskater]

Turn On/Off pops are often caused by the DC plus and DC minus supplies turning on/off at different rates. Check the large DC supply caps.