03-08-2013, 10:58 PM
Hey everyone,
I've been working on this 40-150 for a couple of weeks. I've replaced all the caps and most of the resistors. the ones I left were all within 10% tolerance. I have also replaced all of that wonderful rubber coated wire! I brought up the set on my variac with no nasty surprises
I'm getting static but no stations as of yet. The amp side seems to be working fine. I can vary the volume and tone. also when I hook up my signal generator I can pass the 455kc IF signal loud and clear, just can't pull in any stations or signals from the generator. I'm thinking maybe oscillator trouble? Any one have any pointers or ideas where I should start?
The mystery I have with this set is with the detector/ oscillator tube. The Rider schematic shows that this tube should be a 7J7 loktal tube for the 40-150 series. My 40-150 has a 6J8G tube in it's place, so I'm a little confused! Is this an early production set that Philco changed the design during the run? It's original to the chassis and no ones modification. Also the chassis is clearly stamped 40-150 code 121. I'm stumped, so any ideas would be great! Thanks!
Kevin
I've been working on this 40-150 for a couple of weeks. I've replaced all the caps and most of the resistors. the ones I left were all within 10% tolerance. I have also replaced all of that wonderful rubber coated wire! I brought up the set on my variac with no nasty surprises
I'm getting static but no stations as of yet. The amp side seems to be working fine. I can vary the volume and tone. also when I hook up my signal generator I can pass the 455kc IF signal loud and clear, just can't pull in any stations or signals from the generator. I'm thinking maybe oscillator trouble? Any one have any pointers or ideas where I should start?The mystery I have with this set is with the detector/ oscillator tube. The Rider schematic shows that this tube should be a 7J7 loktal tube for the 40-150 series. My 40-150 has a 6J8G tube in it's place, so I'm a little confused! Is this an early production set that Philco changed the design during the run? It's original to the chassis and no ones modification. Also the chassis is clearly stamped 40-150 code 121. I'm stumped, so any ideas would be great! Thanks!
Kevin
