Hammond 1670
 

Can anyone with an older reference list inform me what the specs of this
power transformer are?

Thanks,

Steve / VE7SL

Hammond 1670
 

Are you sure that this is a power tx ? My catalogue lists the 1600 series
as outputs for various impedances..
VE7AFN.
"jsm" wrote in message
...


Can anyone with an older reference list inform me what the specs of this
power transformer are?

Thanks,

Steve / VE7SL

Hammond 1670
 

No I'm not certain Miki...perhaps it is an AF plate xfrmr?

Steve

Are you sure that this is a power tx ? My catalogue lists the 1600 series
as outputs for various impedances..
VE7AFN.
"jsm" wrote in message
...


Can anyone with an older reference list inform me what the specs of this
power transformer are?

Thanks,

Steve / VE7SL

Hammond 1670
 

My catalogue is probably 25 years old and has listings for audio
output transformers up to No. 1668. Do you have a center-tapped
primary and the various output impedances showing continuity amongst
themselves ? (but insulated from the
promary) miki.
..
Steve McDonald" wrote in message
...


No I'm not certain Miki...perhaps it is an AF plate xfrmr?

Steve

Are you sure that this is a power tx ? My catalogue lists the 1600 series
as outputs for various impedances..
VE7AFN.
"jsm" wrote in message
...


Can anyone with an older reference list inform me what the specs of this
power transformer are?

Thanks,

Steve / VE7SL

Hammond 1670
 

In article ,
miki wrote:
My catalogue is probably 25 years old and has listings for audio
output transformers up to No. 1668. Do you have a center-tapped
primary and the various output impedances showing continuity amongst
themselves ? (but insulated from the
promary) miki.

If you are sure this is a broadband audio transformer, get your scope
and a 1KC square wave generator (the calibration generator on the Tek
scope is probably good enough. Pick one winding, and apply the square
wave, then pick another winding and look at it on the scope. Apply shunt
resistance across the scope probe until you see a nice square wave with
only a tiny overshoot. Now you know the impedance of one winding. Do
this repeatedly and figure the winding impedance of all of them.

From this you should be able to figure out what is intended as the primary
and what is intended as the secondary, if you have a vague idea of the
intended application.

Now, you can put 6.3V AC across the primary through a capacitor, then
look at the secondary on a scope. Use a bench supply to add some DC
offset to the primary, and keep craking the DC voltage up until you
see the level of the sine wave on the output start to drop off. NOW
you know the level of acceptable DC offset current before the core saturates
at near-zero power, from which you can fudge a full-power value.

These are the two important things you want to know about an audio
transformer. Power level is a little harder but you can just apply 60 Hz
into a big load resistor until the transformer saturates. Full power
fresponse tests will require an amp, though.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Hammond 1670
 

Miki - the output is a single center-tapped winding only.

Steve

Hammond 1670
 

OK. I've gone as far as I can go. Why not ask the factory ?
http://www.hammondmfg.com miki.


"jsm" wrote in message
...

Miki - the output is a single center-tapped winding only.

Steve

Hammond 1670
 

Crap Miki !!

I looked again (third time now) just to make sure of the number. It is
actually a 167Q...a little tiny tail on the Q, the *******s. Sorry for so
much trouble...gonna have to get quad-focals as these tri-focals obviously
not up to Hammond standard :-)

Steve

Hammond 1670
 

"jsm" ) writes:
Crap Miki !!

I looked again (third time now) just to make sure of the number. It is
actually a 167Q...a little tiny tail on the Q, the *******s. Sorry for so
much trouble...gonna have to get quad-focals as these tri-focals obviously
not up to Hammond standard :-)

Steve


From your first post, I thought "167" is what a lot of their power
transformers started with. The catalog I have from about 1972 doesn't
even list any "1670's".

You'll be disappointed though.

I see no straight 167Q.

But, there is a 167Q5, which is 5v at 6amps. There is a 167Q6, which
is 6.3v at 6amps. There is a 167Q12, 12.6v at 13.6 amps. And there is a
167Q14, which is 14v at 6amps.

Obviously the "Q" must denote 6amps, at the number following the "Q" is
the voltage.

It's no wonder the number seemed familiar. I have some in the basement.
The large secondary windings are the giveaway.

Michael VE2BVW

Hammond 1670
 

GROAN miki.


"jsm" wrote in message
...


Crap Miki !!

I looked again (third time now) just to make sure of the number. It is
actually a 167Q...a little tiny tail on the Q, the *******s. Sorry for so
much trouble...gonna have to get quad-focals as these tri-focals obviously
not up to Hammond standard :-)

Steve

Hammond 1670
 

Michael - thanks for the look. Apparently it is 25V CT...sorry for all the
trouble.

Steve