40-180 tube changes

Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Linear Mode

40-180 tube changes

Radioroslyn
Phorum Expert

Posts: 7,323
Threads: 270
Joined: Dec 2009
City: Roslyn Pa

#14

06-07-2015, 10:11 AM

After taking a second look I think I would unground that resistor. Circuit wise it doesn't make a lot of sense cause it will pull the plate voltage on the osc section of the mixer way down. Tube manual sez the triode section can take up to 250vdc which less than the chassis is providing. Is your 4.7K resistor in spec?

Terry

(This post was last modified: 06-07-2015, 10:11 AM by Radioroslyn.)

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

40-180 tube changes - by Patrick - 05-30-2015, 05:53 PM

RE: 40-180 tube changes - by Radioroslyn - 05-30-2015, 07:48 PM

RE: 40-180 tube changes - by Patrick - 05-30-2015, 08:29 PM

RE: 40-180 tube changes - by Patrick - 05-31-2015, 07:43 AM

RE: 40-180 tube changes - by mikethedruid - 05-30-2015, 07:50 PM

RE: 40-180 tube changes - by Patrick - 05-30-2015, 08:31 PM

RE: 40-180 tube changes - by Radioroslyn - 05-31-2015, 07:32 AM

RE: 40-180 tube changes - by Patrick - 05-31-2015, 07:51 AM

RE: 40-180 tube changes - by Radioroslyn - 05-31-2015, 08:46 AM

RE: 40-180 tube changes - by Raleigh - 05-31-2015, 04:13 PM

RE: 40-180 tube changes - by Patrick - 06-06-2015, 06:05 PM

RE: 40-180 tube changes - by Radioroslyn - 06-07-2015, 08:47 AM

RE: 40-180 tube changes - by Patrick - 06-07-2015, 09:39 AM

RE: 40-180 tube changes - by Radioroslyn - 06-07-2015, 10:11 AM

RE: 40-180 tube changes - by Patrick - 06-07-2015, 10:40 AM

RE: 40-180 tube changes - by Patrick - 06-07-2015, 01:32 PM

RE: 40-180 tube changes - by codefox1 - 06-07-2015, 11:03 AM

RE: 40-180 tube changes - by Patrick - 06-07-2015, 11:48 AM

View a Printable Version

Users browsing this thread: 1 Guest(s)

Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello, I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same. I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting. IF alignment went great, almost all was already spot-on. Adjusting on th...glyphmon — 11:35 PM

Who's Online

There are currently 2025 online users. [Complete List]
» 2 Member(s) | 2023 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me