Model 90 Output Transformer

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

Model 90 Output Transformer

rrova
Junior Member

Posts: 26
Threads: 4
Joined: Feb 2016
City: Nelson State, Province, Country: BC

#13

03-04-2016, 09:53 PM

Yes, the two inner pins are at the bottom (they are labeled with T's & B's in the diagram for Top & Bottom). I agree that chassis and transformer are not wired correctly. I was unaware of the speaker pin wiring convention that you clarified for me, and I appreciate that. Thank you!

I made this rat's nest diagram to help me in identifying the connections as I trace through the circuits (and to make sure I know which tube pin is which). I'm using a signal generator, a 'scope and a signal tracer along with voltage measurements to identify problem areas. With the diagram and the original schematic I can usually keep track of where I am in the circuit analysis. Also, making the diagram helped me to find incorrect values for some components, missing components, and miswired connections.

Find

« Next Oldest | Next Newest »

Messages In This Thread

Model 90 Output Transformer - by rrova - 03-02-2016, 03:52 AM

RE: Model 90 Output Transformer - by klondike98 - 03-02-2016, 08:07 AM

RE: Model 90 Output Transformer - by morzh - 03-02-2016, 09:29 AM

RE: Model 90 Output Transformer - by Radioroslyn - 03-03-2016, 02:19 AM

RE: Model 90 Output Transformer - by rrova - 03-03-2016, 04:53 AM

RE: Model 90 Output Transformer - by Arran - 03-03-2016, 05:20 AM

RE: Model 90 Output Transformer - by rrova - 03-04-2016, 06:05 AM

RE: Model 90 Output Transformer - by morzh - 03-04-2016, 10:34 AM

RE: Model 90 Output Transformer - by rrova - 03-04-2016, 05:43 PM

RE: Model 90 Output Transformer - by morzh - 03-04-2016, 07:32 PM

RE: Model 90 Output Transformer - by rrova - 03-04-2016, 08:37 PM

RE: Model 90 Output Transformer - by morzh - 03-04-2016, 09:24 PM

RE: Model 90 Output Transformer - by rrova - 03-04-2016, 09:53 PM

RE: Model 90 Output Transformer - by morzh - 03-04-2016, 09:58 PM

RE: Model 90 Output Transformer - by rrova - 03-04-2016, 10:07 PM

RE: Model 90 Output Transformer - by Tubesforme - 03-08-2016, 03:41 PM

RE: Model 90 Output Transformer - by rrova - 03-05-2016, 04:01 AM

RE: Model 90 Output Transformer - by Radioroslyn - 03-05-2016, 08:06 PM

RE: Model 90 Output Transformer - by rrova - 03-05-2016, 08:53 PM

RE: Model 90 Output Transformer - by morzh - 03-05-2016, 08:53 PM

RE: Model 90 Output Transformer - by Radioroslyn - 03-05-2016, 10:35 PM

RE: Model 90 Output Transformer - by morzh - 03-05-2016, 11:15 PM

RE: Model 90 Output Transformer - by rrova - 03-07-2016, 02:47 AM

RE: Model 90 Output Transformer - by morzh - 03-08-2016, 03:51 PM

RE: Model 90 Output Transformer - by rrova - 03-08-2016, 06:17 PM

RE: Model 90 Output Transformer - by Tubesforme - 03-09-2016, 10:59 PM

RE: Model 90 Output Transformer - by rrova - 03-09-2016, 11:04 PM

RE: Model 90 Output Transformer - by Tubesforme - 03-12-2016, 05:47 PM

RE: Model 90 Output Transformer - by Tubesforme - 03-10-2016, 08:35 PM

RE: Model 90 Output Transformer - by morzh - 03-08-2016, 06:50 PM

RE: Model 90 Output Transformer - by rrova - 03-09-2016, 05:33 PM

RE: Model 90 Output Transformer - by morzh - 03-09-2016, 05:39 PM

RE: Model 90 Output Transformer - by morzh - 03-10-2016, 11:33 AM

RE: Model 90 Output Transformer - by morzh - 03-10-2016, 09:19 PM

RE: Model 90 Output Transformer - by rrova - 03-11-2016, 01:06 AM

RE: Model 90 Output Transformer - by morzh - 03-11-2016, 10:36 AM

RE: Model 90 Output Transformer - by Arran - 03-13-2016, 05:31 AM

View a Printable Version

Users browsing this thread: 4 Guest(s)

Recent Posts
Rusty Tuning Condenser
Thanks guys. I think I'll give the Naval Jelly a try since I can better control where it goes.dconant — 09:23 AM
Philco Model 80 Transformer resistance
Just forget this number, it is useless anyway. Simply proceed with your project.morzh — 10:08 PM
Philco Model 80 Transformer resistance
My $0.02 is that it is a misprint. I tried to look up the value for the similar 84 and 37-84, and ther is no resistance...MrFixr55 — 09:51 PM
Philco Model 80 Transformer resistance
Thanks for the quick reply! Hmm...well that's good, so what am I seeing that's 1042 ohms on the schematic for the pow...Mike L — 08:46 PM
Philco Model 80 Transformer resistance
The DC resistance of the primary is 8 to 9 Ohm.morzh — 07:54 PM
Philco Model 80 Transformer resistance
I have a feeling the primary winding on the power transformer is bad. My resistance reading on the primary side is 9 ohm...Mike L — 07:48 PM
Rusty Tuning Condenser
I would try Naval Jelly and use a soaked pipe cleaner to get it where it needs to go.RossH — 06:56 PM
38-10T chassis Restoration begins
Hello Dconant , they sold mica to use as a insulator between transistors and their heatsinks too. Rob I will remove th...radiorich — 02:52 PM
38-10T chassis Restoration begins
Thanks for the info guys. I always wondered why the use of mica. Now I know.dconant — 01:52 PM
38-10T chassis Restoration begins
Most common plastics have a dielectric constant in the 3-4 range whereas mica is around 6. This means that even if you w...Steve D — 01:46 PM

Who's Online

There are currently 4026 online users. [Complete List]
» 1 Member(s) | 4025 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me