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Gain control on gen 1 Orion amplifiers
Gain control on gen 1 Orion amplifiers
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Old 7th December 2018, 06:36 PM   #71
GEM 592 is offline GEM 592  United States
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Quote:
Originally Posted by Gioba View Post
Hi, have you replaced the caps 470 uF after the leveling capacity (the four axial caps)?
For Orion moon & stars is the first thing to fix, maybe it's the cause.
Those are 3300uF 25V on these amps, but no I haven't. Thanks.
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Old 8th December 2018, 04:44 AM   #72
GEM 592 is offline GEM 592  United States
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I have had this amp hooked up and used constantly for a few days now, just as I left it before, and the problem hasn't reappeared yet. When it does, and it will, I will check if either muting transistor has come on by measuring gate voltages, and update.

On the other amp, I replaced the two power supply 3300uF 16V caps and the problem persists. When powered up, without any signal input, it puts out steady high-pitched noise. When I connect signals, both channels play but are very noisy. There are no obvious signs of damage, the gain pot has been cleaned, I'm not sure how to proceed. Perhaps I will start by making a new thread about it.
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Old 8th December 2018, 06:43 AM   #73
Perry Babin is offline Perry Babin  United States
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Please don't mix repairs in a thread.
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Old 8th December 2018, 12:54 PM   #74
Gioba is offline Gioba  Italy
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Quote:
Originally Posted by GEM 592 View Post
Those are 3300uF 25V on these amps, but no I haven't. Thanks.
Sorry, maybe i don't write exactly.
I say the two caps 16v/470 uF downstream the leveling caps (those axials).
These ever are the first fixing in my Orion moon & stars, and cause the problems you tell.
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Old 8th December 2018, 02:15 PM   #75
GEM 592 is offline GEM 592  United States
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Quote:
Originally Posted by Gioba View Post
Sorry, maybe i don't write exactly.
I say the two caps 16v/470 uF downstream the leveling caps (those axials).
These ever are the first fixing in my Orion moon & stars, and cause the problems you tell.
Ah yes I thought you might have meant those.

You are right, in the second amp that has noise now those have not been replaced, thank you very much for the tip. Probably should just replace them.
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Old 8th December 2018, 11:41 PM   #76
Gioba is offline Gioba  Italy
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Yes, is the same thing of 250 amp, these two caps to fix as soon.
And cleaning good, cap's acid can cause damages to PCB and components.
And hope you resolve the problem, but if it isn't that, those two dangerous caps must to be replaced anyway.
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