Upon the date 12:18 AM 10/28/01 -0400, Glen Goodwin said something like:
>Ran across this on Ebay tonight:
>
>http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1649083427
>
>This transformer has a 115V primary, and several taps on the secondary
>ranging from 5 to 850 volts. What kind of device might require such a wide
>range of voltages?
Without digging through several boxes up in the library for my 1950's/60's
UTC Company catalogs, I will say this is for an early 50's television - a
large screen black & white or one of the early color sets. I could check if
you'd like me to.
I feel it is obvious this is the case based on my considerable experience
with early TV's. My assumptions on the secondary lineup is as follows: 5V _at_
6A for two 5U4G full wave rectifiers; 6.3V _at_ 4A for the damper tube heater
and the CRT heater (meant to be isolated and held at a higher positive
level to prevent heater-to-cathode breakdown because the cathodes would be
at maybe +250 volts DC or so), 6.3V _at_ 8A for the rest of the tube heaters,
850V _at_ 430MA, 1050V @ 400 MA. for the B+ voltages. Methinks the two high
voltage secondaries are a single center tapped winding with a choice of two
tapped levels - depending upon the original requirements. This is
apparently a replacement transformer meant to fit several different chassis.
>
>BTW (for those without 'net access) the device sold for USD103.50 and there
>were no details as to what this thing was used in. This leads me to
>believe that it's a high failure-rate component in a relatively expensive
>(and not uncommon) piece of gear.
Well, if I had, for example, a 1954 RCA color TV with a bad power
transformer and this was a replacement, I think I would fork over that
much. Probably not more, but maybe that much. In this example I gave, the
RCA CTC-1 chassis was the first color set mass produced in the States in
1954 and this USD103.50 would be worth it to me if I knew I could get a
working set.
HTH,
-Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt_at_netsync.net
Member of Antique Wireless Association
URL:
http://www.antiquewireless.org/
Received on Sat Nov 03 2001 - 19:21:14 GMT