Scott 130 preamp buzzing on one channel

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

Got this preamp last year and started rebuilding it via some of Michael Samra's suggestion. However, in hooking it up to a pair of Heathkit monoblocks, I noticed a substantial buzz in channel B, scoping it shows a 120hz signal riding on the audio, indicating a power supply issue. The power supply has been totally rebuilt, and the preamp makes no noise in tuner or aux channels. Any suggestions? I do note in the 195v section which splits and feeds A and B channels separately that the 120hz is in the B channel and not the A channel. Also wondering if in rebuilding by stringing the grounds from cap-to-cap that I am introducing hum into the power supply? Thanks!

This post is made possible by the generous support of people like you and our sponsors:

Western Glow Tube Service

Topic - Scott 130 preamp buzzing on one channel - gkargreen 13:27:22 07/26/17 (7)

RE: Scott 130 preamp buzzing on one channel - Michael Samra 13:48:29 07/26/17 (6)

OK, found one issue that solved the most egregious - gkargreen 17:47:43 07/26/17 (4)

RE: OK, found one issue that solved the most egregious - Michael Samra 10:47:25 07/27/17 (3)

RE: OK, found one issue that solved the most egregious - gkargreen 15:31:18 07/27/17 (2)

RE: OK, found one issue that solved the most egregious - Michael Samra 03:05:18 07/29/17 (1)

Thanks, Michael, it's working pretty good now! - gkargreen 09:17:03 07/29/17 (0)

RE: Scott 130 preamp buzzing on one channel - gkargreen 15:18:05 07/26/17 (0)

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.