Winding Specs Of Audio Transfomerers For The Fairchild 670

Here you will find all i know about the 670 iron.

But only this chain:

UTC A-26 Used Backwards
Triad Output
UTC _Weirdass ( and you know what I am talking about)
Input to Control Amp
and finally, if you do not have a hernia by now, the Chicago Output!

Enjoy you brethren!
:sam:

Umm, no, do not bother me with pwr supply stuff at this moment, all I can say about that topic right now, and there is a lot to be said about the transfer function of the power supply, as there is a pcb cap on the front end, and weird stuf like drippy oil cans that you probably do not want to mess with, as well as the weird ass Sola hconstant voltage heater transformer, unless you like the buzz.


OK, here we go, first up, UTC A-26 with the stupid shield that mmay or may not mean squat:

The Input transformer to the Fairchild 670 is an Output Transformer.

What did Rein say in that interview?

More headroom!

(or the geek equiv.)

So no wimpy UTC A-10 on this beast, no way!

OK, who knows the ratio on the A 26?

OK, so what is that ratio spelled backwards?

What kind of lams?

Hint: Shelf shielding)

How many db is the stupid A-33 shield worth?


BTW, the cathode bias, which is important to know, can be expresed as the following:

let me be the first to reply to this .......................
oh , i gots no reply , hmmmm

knowing i'll never have a 670 at least i can say that's o.k.
cause their not Rhos

Screw it, lets get to the beef, the UTC Y-6431

hidden
xfmr, thats all anybody is missing:

OK, here, for the first time on any forum, is the exact winding spec for the elusive

its about a ten henry deal,


Control Amp Input Transformer:

UTC Y-6431 Full Props Out to Doc Hoyer:

Terms 1-3
Colors: 1 Red 3 Brown
6 Black
8 Green
(this is internal mojo for xfmr geks only, dont wory abouty wire color code)

500 Turns of #38, 4 layers


6 S Blk 4800 Turns # 43 21 Layers

8 - Grn 500 Turns #38 4 Layers

7 - 4800 Turns # 43 21 Layers,

good luck with your 21 layers.
use your hand, not a wire tensioner...
. :thumb:

oh, lams, sorry,

UI31 15/32 inch stack, you guess the formula..

triple shielding also, do not know what effect this ha on the 670...

oh, sorry, insulation, because insulation, lams, and coil should be three different posts, because those are the three most important things in xfmr design,

som there is 1 mil thick insulation between each of the 21 layers...



but not to worry, next ups mystery guest Triad HS 52, signal out,

can you dig it, if you can dig it, please dig it..

Triad HS - 52 Fairchild Output:

OK,

Fairchild 670 Signal Amp Output = Triad HS 52

255 Turns of #31

1425 Turnsa of #39

1425 Turns #39

255 Turns #31

50/50 Core 21 EI LAms 1/2 x 7/8 inch stack...

OK, next up, 670
Control Amp Output

I think..

CTC - 150

Marked T-104 and T-204 according to Alexandervich...

thats the one with the weird Tert wining, remember?

BTW, I am looking at this core fore the 670 control out, I mean, it can take a lot of B max, know sayin?
29gam6 for crisakkes and what a stack, i wonder why?

Looks like Chitown PCC 200 was power trans..

Bonus material for reqading this post:


Umm. Peerless K 241 D Supermendur 21 kilogauss
49-49-2% Moly w mu shield-copper ring-1/16 inch Altec Pre
38EI 3/8 th x 3/4 stack 12.25 mil 492 turns split bobin 6020 turns, jeezus!
Pri:123 t

LS 10 X:

UI 31
1/4 inch stack x 1/2 inch stack..

Western Electric 618b +8dbm...6 kilo gauss

where do you get these infos from? Did you hack them? :shock:

I own original Y 6431, as well a winding info from Doc, but I could hack, but it is the same as A10 kind of,

Only backwards...

I have hacked HS 50, but not 52, so we trade info, no need to hack up too much, ehh?

so HS 52 is frm Doc Hoyer also.

Ever heard of Juan Martinez?
Emperor of the air?
Umm, Don Langevin, ?

Chris Petty of Shumacher?

Secret of the W.E 197a?
Runs at 16 kilogauss.
8000t pri
1536 sec


WE 618B? 16 cycles, +10dbm, = 4 kilogaus.



or 2.45 volts across 600 ohms.

942a, each side of torroid exactly thesame...

811a, torroid has to be gapped

HA 129
600 ohm- 3-5-6- #32 - 340 t loop 5 200 t stop 6,
then 2,390 t #39, 9 layers

get it?

LS 10X = UI31

Umm. dont use beyer ciols in electrvoice 635, they freeze up.

Beyer usue swiss winders, did tou know that?

Frank MacIntosh, as well as Langevin, started at WE, cool info, ehh?

check into J Peter Moncrife

or Bob Swartch

ADM consolse suck, or so I am told.

Oh, I'm sorry, almost forgot the UTC A 26 Input with a 33 shield,

UTC A 26 is 2000 turns #43
530 Turns #37
2000 Turns #43

50-50, a good , small size lam choice for this application.


Which is what?

S-217-D ?

you mean 7 layers of #36 on a 12 L lam?
225 t per layer?
1575 turns?

Or a Tert Winding of 1 layer, 71 turns #36, then a 252 Turn 3 1/2 layer sec winding#29 you say?

12L lam:

probaly an L shaped lam, 1 and 7/8 inch by 1 and 1/8 inch


For DCR of 159 ohms pri, 8.7 ohms and 8.4 ohms respctyly?

Oh, don't forget to put the second coil on backawrads.

Oh, so I can use middle winding as shield, what a trip...


What does backwards mean?

Ask Dave at Magnequest.

The secret to the K 241 D is that the 1505 pies are sectioned at 3/8 th inch, = 3010 = 6020, kind of like utc...
3/4 inch stack, way cool, 26/27EE layered paper permalloy/mendur blend


Ummmm UTC A 26 seems to be missing something?
Yes!

There are two coils I believe.

Nothing personal , but
we're gonna have to kill you ,
cause apparently you know TOO much ,
no wait that's G-man spy stuff , well if anyone was brave enough to
manufacture a repro you ought to have a good consulting job .

Perhaps you could trade info with Sowter and barter some iron ?

I sure hope Doc has some understudies who can keep cranking this stuff out.

CJ,

811a, torroid has to be gapped

Click to expand...

How would you manage to do that ?

Steve :thumb:

CJ,

Quote:
811a, torroid has to be gapped


How would you manage to do that ?

A: (?)
dont they saw the core in half, polish the ends so it goes together tight, put nomex or whatever 'tween the halves @ 1 of the cuts to break electrical path and glue it back together?

Shabtek,

Surely, that would be a 'C- core' with a gap, not a Toroid ?

Steve :thumb:

I so sorry but, Could someone to do a REALLY CLEAR "resume" of the spec for these Transformers???.....

Thanks
Opacheco.

I think if CJ was "really clear" he might get "really sued".  I find the mix of jargon and stream-of-conciousness poetry quite captivating.