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Antique Radio Technical Forum
The Hum From The Speaker

Posted by Johnny on 04/15/2009 12:01


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:::Thanks for getting back Edd. And everyone else too. I will perform these tasks as soon as the radio is back together again. Knocked off at 10 last night and here it is 3:45 am and I'm back at it. Should be done soon. Couldn't sleep anyway.
::This is my nephews first resto job. A few mistakes were made and I believe I have identified all of them and made the necessary corrections. I did however decide to pull the band switch assembly because it is the only thing I haven't thoroughly checked. Found mostly dirt in this area. I am having some trouble making sense of the pinouts on the "OSC. TRANS." as pictured on the schematic. Bottom center of page. It looks as if pin 1 is at the right then pin 4 is the next pin at the top of the coil with the black dot next to it. Then pin 7 (also black dot) and 5 on left side. Pin 3 and 2 appear to be at the bottom of the coil. It also appears that pin 6 is at the top of the back of the coil. Is this view looking down with the chassis upside down or looking down with the chassis right side up? With the chassis upside down and looking down at the osc. trans my pin 6 is at the bottom. Not as pictured at the top. Once again, what's the view? I can't trust the nephews connections so I really need to determine this. Lots of connections between band switch and these coils. "ANT. TRANS." is much easier to read but once again... What is the view on this? Looking up, down etc.?
::I really do appreciate the help with this and I know we'll get it figured out. Now! Any advice on how to teach a young man patience? I'm telling him that you just can't rush through one of these things.
::Thanks folks,
::Johnny

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:Hi Johnny,
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: I have a Philco 41-290 that I just picked up and havn't started on yet. After reading your post and EDD's comments and pictures, I decided to pull the chassis and have a look. The schematic is the same as yours except for the #37 phase inverter tube. The underside of the chassis are identical as far as part layout. I can take a picture of the underside of the chassis for you to view, and can email it to you. I believe I still have your email address when we mailed back and forth on the Grunow 589 a couple of months back.
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:Do you want the pictures sent so you can see how everything is wired? My unit looks like it has never been touched, even has the original e-Caps.
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:Let me know, Doug H
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:That would be a great help Doug just in case I am still counting these pins backwards or upside down, inside out etc. Clicking on my name should get you my email again. Thanks!!! Just for additional backup a pic of the Ant. Trans. #3 on the schematic would help too. I could double check myself on that one too. Thanks again! Johnny

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::The way that I am seeing that osc coil terminals, is per the enhancement.
::Now, as far as the locational dimensional view, rely upon the sole one sided terminal reference of # 6 at the very bottom. Additionally , use for referencing, the physical presence of the 22k resistor that is shunting terminals #5 and #6.
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::73's de Edd

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The Hum From The Speaker 
Johnny 04/11/2009 14:58 
Thomas Dermody 04/12/2009 00:16 
Ed M 04/13/2009 13:28 
Johnny 04/13/2009 19:10 
Thomas Dermody 04/13/2009 21:05 
Lewis L 04/13/2009 21:18 
Edd 04/13/2009 22:43 
Johnny 04/14/2009 07:01 
Edd 04/14/2009 11:27 
Doug H 04/15/2009 11:38 
Johnny 04/15/2009 12:01 
Doug H 04/15/2009 12:40 
Johnny 04/15/2009 17:51 
Johnny 04/15/2009 11:54 
Johnny 04/15/2009 19:58 
Johnny 04/16/2009 02:15 
The Rework Is Done 04/15/2009 23:21 

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