Clarion AC-61 Completed PLUS the Proof - - -

The AC-61 or AC61 is working. A power transformer from a Philco 90 was used to replace the missing original. The 90's transformer had all of the original leads replaced prior to installation as well as combining the two 2.5 volt, center tapped, filament windings into one.

The interstage transformer had failed and someone had attempted a cap coupled bypass off of the 224 detector. I doubt that this worked very well. This transformer must provide grid voltage for the push-pull 245s. The model AC70 added a 227 tube to overcome the challenge of using a 224 as both a detector and a first audio stage.

Another very interesting design element is the use of the 2.5V filament center tap to provide voltage for the speaker field coil. The plate current of the two 245s provides 48V to the field coil which is 800 ohms. Auto biasing is still accomplished, but there is a .3uf cap added as a bypass around the field coil to ground. I can't recall ever having seen this before.

Having aligned the radio which is a TRF, I tuned several of our local stations all of which have about the same program material - conservative talk radio.

Then it dawned on me! This radio is proof of the claim that the news media has a "liberal" bias. (SEE earlier posting). This radio definitely is "left of center".

I wanted to bring balance to the radio by leaving it on various conservative programs for several days, all in an attempt to move it to the right, making it more "fair and balanced", but it seemed to have little or no effect- on the radio.  (insert smilie HERE) On the other hand I fashioned a tinfoil helmet for myself to keep the government out of my head.




Russ