[Boatanchors] RCA Transformer: Looking for Details

[pmarkavage at juno.com]

We had two color TV consoles back in the "good old days" that used this
type of transformer/rectifier arrangement.

Pete, wa2cwa

On Mon, 8 Aug 2011 00:19:17 -0700 "David L. Foreman" <davelf11 at cox.net>
writes:
> 
> --------------------------------------------------
> From: "William Morton" <w_b_morton at hotmail.com>
> Sent: Sunday, August 07, 2011 20:39
> To: "boatanchor" <boatanchors at puck.nether.net>
> Subject: [Boatanchors] RCA Transformer:  Looking for Details
> 
> > 
> > Hello All,
> > 
> > Came across a vintage RCA transformer having twin octal rectifier 
> sockets on the top with 'bear trap' clamps.  There are three bits of 
> information stamped/engraved into the top:  the old style RCA logo 
> (about 1/4 inch in diameter), the number 1106863-1, and the number 
> 412723.
> > 
> > I carefully measured the resistance between all sets of wires to 
> determine the primary and the secondaries, popped in two 5U4GB's, 
> then wired the primaries to the output of a Variac and slowly raised 
> the primary voltage to 120 VAC.  There are two 6.8 VAC secondaries 
> (no load, one set is 16 ga stranded the other is 18 ga stranded) and 
> the HV output measured 374 VDC with a ~92 VAC wave riding on top.  I 
> don't have a choke handy and didn't want to solder a bunch of 
> capacitors together to make a filter (lazy and it's getting late in 
> the day), so I do not know what the filtered DC output voltage would 
> be.
> > 
> > Here is my question to the group:  Does this type of transformer 
> sound familiar to anyone or is there a reference available so I can 
> determine the output currents of the secondaries?
> > 
> > Thank you all in advance for your help.
> > 
> > Best Regards,
> > 
> > William
> 
> William, it sound like a transformer from one of RCAs Big old tv 
> set.
> Dave