Smokin' caps!

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I constructed a filament supply for 4P1L in filament bias which resulted in the last cap emitting smoke. Hmmm......
Voltages seemed to be correct. Goal was 27.5v at 620mA. Circuit was CLCLC, 25v transformer, Schottky bridge, 10,000uF cap, 280mH choke at 2.7A, 2,000uF, another choke the same, all in a different chassis. Then in the amp itself, 1,000uF at 35v before Rod Coleman regs. That's the cap that started smoking.
What's going on? Some interaction of chokes and caps?
I then used bench supplies to feed the filaments, and everything fine. Previously I'd used bench supplies for months in this amp.

Edits: 11/09/15 11/09/15

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

Kimber Kable

Topic - Smokin' caps! - andy evans 08:07:50 11/09/15 (7)

If polarity is correct, you have a short - FenderLover 11:18:06 11/09/15 (0)

RE: Smokin' caps! - DAK 10:38:14 11/09/15 (0)

RE: Smokin' caps! - drsx 09:51:49 11/09/15 (0)

RE: Smokin' caps! - jyourison 08:10:42 11/09/15 (3)

Polarity - andy evans 08:14:00 11/09/15 (2)

RE: Polarity - Triode_Kingdom 11:19:42 11/09/15 (0)

RE: Polarity - andy evans 08:32:27 11/09/15 (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.