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

Thread Closed

Output Transformer Resitance
#20

(04-07-2012, 10:56 AM)exray Wrote:  
(04-06-2012, 07:39 PM)marv Wrote:  OK, I am getting ready to attempt a rewind of this thing and have one more question. I counted the turns of the bad OT and measured 3984 turns on the primary and 39 on the secondary. I think the turns ratio agrees with what Ron and Morzh stated above. By my measurent the primary used #37 wire and the secondary #20. I have some new 37 on the way but do not have any 20.

What will happen if I use #22 for the secondary maintaining the correct number of turns? Will the impeadance still be correct but result in a lower watt rating?

Hi,
I'm a bit late to this thread. You might be able to sneak by with #22 but it would probably be worth the effort to get some 20 so as to not have to worry about it later. I guess re-doing 39 turns wouldn't be a terrible job if you had to rewind it.

On that high 6K5 voltage. If its still high after you get the xfmr redone then you should probably question the type of meter you're using. That's a very high impedance point and the meter they used originally to create the voltage chart probably loaded down the circuit somewhat. A DMM will read high at points like this.

So long as you have enough "real estate", secondary guage not that important.

Make sure you have corrected voltage divider circuits before firing up again. I like to insert an old fashioned analog DC ammeter in circuit while bringing set up slowly on variac to see if there is a lingering problem


Messages In This Thread
Output Transformer Resitance - by marv - 03-26-2012, 07:45 PM
RE: Output Transformer Resitance - by tab10672 - 03-26-2012, 08:07 PM
RE: Output Transformer Resitance - by marv - 03-26-2012, 08:36 PM
RE: Output Transformer Resitance - by tab10672 - 03-26-2012, 09:24 PM
RE: Output Transformer Resitance - by codefox1 - 03-27-2012, 01:26 AM
RE: Output Transformer Resitance - by marv - 03-27-2012, 11:44 AM
RE: Output Transformer Resitance - by tab10672 - 03-27-2012, 03:24 PM
RE: Output Transformer Resitance - by Ron Ramirez - 03-27-2012, 06:19 PM
RE: Output Transformer Resitance - by morzh - 03-28-2012, 09:21 PM
RE: Output Transformer Resitance - by marv - 03-27-2012, 07:10 PM
RE: Output Transformer Resitance - by Ron Ramirez - 03-27-2012, 07:44 PM
RE: Output Transformer Resitance - by codefox1 - 03-27-2012, 08:50 PM
RE: Output Transformer Resitance - by marv - 03-28-2012, 09:33 PM
RE: Output Transformer Resitance - by marv - 04-06-2012, 07:39 PM
RE: Output Transformer Resitance - by exray - 04-07-2012, 10:56 AM
RE: Output Transformer Resitance - by codefox1 - 04-19-2012, 08:23 PM
RE: Output Transformer Resitance-UPDATE - by marv - 04-19-2012, 02:35 PM
RE: Output Transformer Resitance - by morzh - 04-19-2012, 03:13 PM
RE: Output Transformer Resitance - by marv - 04-19-2012, 07:13 PM
RE: Output Transformer Resitance - by Arran - 04-19-2012, 07:54 PM
RE: Output Transformer Resitance - by marv - 04-19-2012, 08:35 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM

[-]
Who's Online
There are currently 1701 online users. [Complete List]
» 2 Member(s) | 1699 Guest(s)
AvatarAvatar

>