Tweakers' Asylum

RE: atkinsonrr PLEASE READ

97.122.165.130

atkinsonrr

In Reply to: RE: atkinsonrr PLEASE READ posted by Brick527 on April 21, 2018 at 09:16:22

OK, then for sure I will replace the 3.9 cap at the DAC output.

I may experiment a bit with paralleling .01 or .1uF caps (rated for at least 100V) with the big 3.9 film thats in there, but that's it.

Thanks again!

Follow Ups:

RE: atkinsonrr PLEASE READ - Brick527 16:00:06 04/21/18 (2)
Two things.
One is the dac tube stage was running at a different parameter due to DC in the feedback most likely altering the operating voltages. Voltages could be different than the readings you took with the cap out of circuit.
Second thing is a lot of tubes show full B+ voltages until they start conducting so there's a possibility that the 40 or so volts is where the tube settled.Could start out much higher than that.Most designers use caps that are rated for the full b+ for that very reason.

Edits: 04/21/18
- RE: atkinsonrr PLEASE READ - atkinsonrr 12:39:26 04/24/18 (0)
  Thanks for the additonal info Brick. Regarding voltages before the tubes settle in after turn on, I guess I lucked out again. My DAC has a 'warm up' mode during which the outputs are muted. Only once the tubes stabilize are the outputs connected to circuit.
- RE: atkinsonrr PLEASE READ - Tweaker456 16:10:08 04/21/18 (0)
  Ok, thanks for the answer.
  "The needs of the many outweigh the needs of the few or the one"
  Vulcan Proverb

Post a Followup:

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.

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

VH Audio