To Lewis, If the local oscillator is really the "non-tunable" transformer, then i have checked its inductance. As far as knowing what frequency it is, that might be above my head, which explains my dependence on schematics and manuals. I understand the theory of a fixed tank circuit, which a think a local oscillator is, but i am not independent enough to fix any radio, but i learn more with every guitar amp and radio i fix. Thanks to both of you.
:
:
:

: : : : : : : : : : :Sir Adam . . . . . . : : :One each schematic . . . circa '54ish . . . as per request . . . : : : :" so I think someone tried to "TUNE" the cans " : : : :the cans . . the cans ? . . OHHHH- NOOOO . . . not the CANS ! . . . PUH-LEEEZ . . .ANYTHING, but the cans ! ! : : :And what I really, really, REALLY think, that you want . . . . quoting the Spice Girls . . . is the OWNERS manual for that unit, which I, personally, nevah, nevah, nevah evah have seen . . .myself . . . just in keeping on that same kick. : : :Now, with a shiftiing into your fully cognitive and concentrative mode, refer to my mark up of the vol-you-me control on the provided schematic. : : :And now, I'm just going to answer everyones LAST question FIRST. : : :To simplify the switchless interfacing of a phono input into the receiver. : : :Initially note the movable rotor of the volume control at the top of the control as the arrow. : : :Now note the spec of the control, with it being a 1 meg unit with CENTER tap, which you see going directly to the ground buss just below. : : :Sooooooo with you plugging your I-Pod ( knock off? ) right in to the phono input , with its magnificent 32ohm to this high impedance input mismatch, your initial thought, when advancing the volume control, was that Boy y y y . . . it certainly seemed to take a long time for the volume to rise. But it did, and doing it so magnificently, as you so profess. : : :Now herein would be the radio operational fallacy, if you will look at the T3 (CAN) 2nd IF transformer and its secondary's bottom right #4 terminal you will see it routed down to supply both AVC DC bias over to the left 2.2 meg R3 resistor and simultaneously BRANCHING to the right, where it would then be providing your radio audio to the left end of that volume control. : : :Soooooooo, that would then be indicative of dead center positioning of that volume control being zero volume position, while IF it is rotated to the right . . .normal expected direction. . . correct ? the volume of a plugged in audio accessory increases. : : :Now if you want to listen to the RADIO, you would advance ??? the control to the LEFT to bring the volume control rotor ever so closer to the end of the control connection that your radio audio is being fed into. : : :Remember ? . . . The initially answered question . . . . Why would they do something like that ? : : :Aside: : : :Man, I'll bet that dual logarithmic audio taper . . . with it incrementing both ways away from center ! . . . was initially raising some eyebrows from the contracted control vendor. : : :Since you will or now have that mam-ooo apart, hows about looking for the pots stamping in of the EIA identifier of the manufacturer . . so we can see who got the honors. : : :Or if someone has Sams 274-9 it should be in the parts list . . . my olde yaller SAMs of that vintage are out at the mule barn with no plans of my going there til the end of the month. : : :Now on its cluster of numbers, a few should be the date code of manufacture and some possibly the actual part number with the last few of interest being possibly: : : :Stackpole 304 Ohmite 251 Mallory 235 IRC 214 Clarostat 140 : : :CTS 137 Centralab 134 Allen-Bradley 106 : : :Thassit : : : : :73's de Edd : : : :

:
:
:
:
:

: : : :Ye Olde Tyme Gentile Eclectic 575 Schema: : : : : : : : : : :

:
:
:
:
:
:I picked one of these up at a garage sale. Its an AA5 and the clock works. I did a recap and checked all tubes by using them in another aa5, and they all work great. This radio works hum free and awesome with an ipod plugged into the phono input, but gets absolutely no reception on the tuner. There are no shorts or opens in my if cans, antenna connections, etc. The caps in the if cans show they are still good, so I think someone tried to "TUNE" the cans when this radio just needed a "recap." If anyone can point me to a link for the schematic, or photofacts, it will keep me from throwing this thing out. I have looked everywhere. I have re-aligned and repaired many aa5s in the past, but seem unable to go any further without some specifics on this thing.
:
:
:
:
:Take another radio and see if the local oscillator is working, and on what approximate frequency. Then we can figure out what to do next.
:Lewis
:
: