Tube bias ckt. component matching.

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I had a post here that covered several issues & now I have one final question. In the other post it was established that low value fuses have a DCR of around 3 - 5 ohms. I am repairing a tube amp that has 125mA fuses (4) in the cathode auto bias ckt for the power tubes (4 KT88s). I don't know auto bias ckt designs, but these have an LED in the ckt. I have some 125mA fuses that measure 3.4 ohms DCR (original) & some that measure 6.3 ohms (new). I don't have enough of either to replace all, so I am wondering if I should order more. (6.3ohms) Is it important to have the fuses be all the same value, or is this not an issue. I know it may be hard to answer without seeing the ckt, but I don't have the schematic & haven't drawn up the ckt yet.
Thanks,
Kev

Edits: 04/30/22 04/30/22 04/30/22

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

Herbie's Audio Lab

Topic - Tube bias ckt. component matching. - bugeyed 08:49:03 04/30/22 (6)

established? who and where did they say that? - Story 09:26:03 04/30/22 (5)

who and where - 1973shovel 07:56:46 05/01/22 (0)

RE: established? who and where did they say that? - bugeyed 09:45:53 04/30/22 (3)

RE: established? who and where did they say that? - Story 10:53:04 04/30/22 (2)

RE: established? who and where did they say that? - bugeyed 11:13:55 04/30/22 (0)

and you should always have extras - Story 11:00:05 04/30/22 (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.