In message <Chameleon.4.01.2.961210001011.jproc@>  writes:
> 
> Carl,
> 
> You are absolutely right. Replacement transformers are not cheap. It was my 
> intention to highlight that which is available today and let the restorer 
> deal with the economics.   
> 
> >As you must know, Hammond has minimum orders plus a shipping charge which
> >can really add up on a unique item.  
> 

I downloaded these reference files, and Jerry's effort is much
appreciated. With new iron being expensive, I am always on the 
lookout for iron at hamfests etc and buy if the price is right.

Recently I acquired several low voltage/filament transformers,
mostly made by Hammond. While most had the secondary voltage and
current rating clearly indicated, some did not. Lacking a Hammond
catalog, I looked them up in the Simmonds (a major Canadian distributor)
catalog.  My mystery iron were all Hammond Type X (167 Series),
and I discovered that the secondary voltage and current rating could
be determined from the catalog number.

The catalog number  is of the form

xxx Cvv

where xxx is the series number, C is a letter related to the
current rating of the secondary, and vv is the secondary voltage
rounded down to the nearest integer volt.

The letter C it seems means different things in the different
series, but as a general rule the current rating increases as one
goes through the alphabet.

As the 167 series seems to be the only one without the ratings 
being given on the transformer which is currently sold, the following
may be of interest: Note that this applies only to the 167
series, as well as the 165 and 166 Series:

Letter  Current Rating
B        30 ma
C        50 or 85 ma
D       100 ma
E       150 ma
F       250 or 300 ma
G       500 or 600 or 700ma
J       1 A
K       1.2 or 1.5 A
L       2 A
M       3 A
N       4 A
P       5 A
Q       6 A
R       8 A
S      10 A
T      12 A
U      15 or 16 A
V      20 or 21 A
Z      50 A

Two transformers sitting in front of me are 167 J25 and 167 L60.
Thus the former has a 25 volt secondary rated at 1A, while the
latter has a 60 volt secondary rated at 2 A. A 12.6 volt filament
transformer rated at 8 amps would be 167 R12. A Series 166 33 volt
1A transformer I used a couple of week ago in building a power
supply (using technology verboten in this group) was a 166 J33.

Hope this is helpful to someone :<)

73, Deane D McIntyre VE6BPO
dmcintyr@acs.ucalgary.ca