21zp4a crt sub - Videokarma.org TV - Video - Vintage Television & Radio Forums

		Videokarma.org TV - Video - Vintage Television & Radio Forums > Early B&W and Projection TV
21zp4a crt sub

Notices

Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html


	We appreciate your help in keeping this site going.

Thread Tools

Display Modes

03-29-2025, 07:17 PM

Electronic M Electronic M is offline

M is for Memory

Join Date: Jan 2011

Location: Pewaukee/Delafield Wi

Posts: 15,471

I don't think I have ever seen a set where the 5U4 doesn't have its own heater winding... Only time there's another tube on the 5U4 winding it's a second 5U4 put in parallel for increased B+ current capacity...the 5U4 heater is always the B+ source so if anything else shared it the heater cathode voltage would violate tube specs.

__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

« Previous Thread | Next Thread »

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules

Forum Jump

All times are GMT -5. The time now is 05:32 AM.