Good day all, in the last few months I have upgraded from my Threshold SA-2s to an un-updated pair of SA/12es. Love the big Thresholds as the drive my Kappa 9's as they are supposed to be!
Anyway the 12's have an audible mechanic hum from the transformers. I am supposing that it's due to the age of the PS Caps at 30+ years. It's remarkable these days how difficult it is to find CDE capacitors but I have managed to source the 16 quite reasonably priced and in stock! Very nice.
I am going from the original rating of 27,000uF/85v to a 41,000uF/75v cap as I did also with the SA-2s. (The 2's I actually stuffed 4 per chassis to quite an audible difference.) Figuring that should work just fine.
My question for you fine folk is, I figure I should change the rectifiers as well, 2 per chassis 35A is the original, and should this be increased or just going to a fast IXYS at 35A be sufficient? Also is there somewhere else I should look to update that might be impacting the transformers cause the technical hum?
Thank you in advance!
Scott
Anyway the 12's have an audible mechanic hum from the transformers. I am supposing that it's due to the age of the PS Caps at 30+ years. It's remarkable these days how difficult it is to find CDE capacitors but I have managed to source the 16 quite reasonably priced and in stock! Very nice.
I am going from the original rating of 27,000uF/85v to a 41,000uF/75v cap as I did also with the SA-2s. (The 2's I actually stuffed 4 per chassis to quite an audible difference.) Figuring that should work just fine.
My question for you fine folk is, I figure I should change the rectifiers as well, 2 per chassis 35A is the original, and should this be increased or just going to a fast IXYS at 35A be sufficient? Also is there somewhere else I should look to update that might be impacting the transformers cause the technical hum?
Thank you in advance!
Scott
35A is OK if that is in original
besides caps and rectifiers, think of snubbers for secondaries, in some cases it's helping immensely with transformer hum
read this, it looks complicated at first but it's easypeasy
https://www.diyaudio.com/community/...rmer-snubber-using-quasimodo-test-jig.243100/
besides caps and rectifiers, think of snubbers for secondaries, in some cases it's helping immensely with transformer hum
read this, it looks complicated at first but it's easypeasy
https://www.diyaudio.com/community/...rmer-snubber-using-quasimodo-test-jig.243100/