Phantom Deluxe dead oscillator & RF Amp

[Thomas Lager]

Hello,

     I am trying to bring a dead Phantom Deluxe (AM) back to life.  I have 2 problems that are stumping me.  First, the RF amp doesn't.  It attenuates the incoming signal as evidenced by scope traces on the grid and plate, with the plate trace being a much lower amplitude than the grid.  The 6U7 tube tests good on my Hickock 600 tube tester.  The whole set has been re-capped and out of spec resistors replaced.  Socket voltages on the 6U7 are as follows: Plate +230V reference chassis, grid 1 -1.5V reference to cathode, Cathode +6.5 V reference chassis, grids 2& 3 (tied together) +105 V reference chassis.  

The oscillator, 6J5 voltages are as follows: Plate +150V reference chassis, Grid +4V reference Cathode and 0V reference chassis, Cathode +4.8V reference chassis.  My frequency meter and scope measure no output from the oscillator.  

I am fairly certain that the converter works since I can tune in stations by injecting an unmodulated signal at the grid of the 6L7 at a frequency 455KHz above the desired tuned frequency.

Your thoughts?  Thanks

Tom

[David C. Poland]

THe RF diode adjustment:  one of the 2 x 2 inch metal modules under/inside the tuner chassis with a single adjustment screw out of the top. You would have dismounted these modules to replace the cap(s) that protrudes from it. See Riders vol 14 page 58 for the Philharmonic version for an image. 

May be the one nearest the  rear apron of the tuner chassis -- I don't have shelf chassis to look at.

[mike hadley]

here is a photo of the undersise of my Phantom in the rarly stages of restoration, the two modules that Dave is referring to can be seen,one mounted on the rear apron and the other next to the center divider,

these can be a swine to get out but they do have paper caps in that need to be changed,

the photo shows that my radio had a problem with the coil caused by a previous repairer,

I made a posting here

https://ehscott.ning.com/forum/topics/agc-transformer

when you are there don't forget to check the carbon resistors as these may have drifted high over the years

Mike

[Kent King]

If you need a replacement transformer, I have MANY parts chassis...Kent

mike hadley said:

here is a photo of the undersise of my Phantom in the rarly stages of restoration, the two modules that Dave is referring to can be seen,one mounted on the rear apron and the other next to the center divider,

these can be a swine to get out but they do have paper caps in that need to be changed,

the photo shows that my radio had a problem with the coil caused by a previous repairer,

I made a posting here

https://ehscott.ning.com/forum/topics/agc-transformer

when you are there don't forget to check the carbon resistors as these may have drifted high over the years

Mike

[Thomas Lager]

Thanks Mike.  I replaced those caps as soon as I saw that they were wax paper.  Don't remember if I replaced the resistors, but I make it a rule to check to see if they are out of tolerance and replace any that are.

Now I need to finish the alignment and get out the chrome polish.

Major reconstruction/refinishing to do on the cabinet too.  This project is far from complete.

Are there reproduction knobs available anywhere?  Thanks

Tom

[David C. Poland]

Scott knobs 1938 to 41 on Phantom, Super 12, Masterpiece and Laureate, and later BOL Philharmonics:

There have been convincing plastic molded repos in the past but not now that I know of.  Originals are Walnut. All have set screws, including the repo set I once had.

Configuration is pair of pinch style top right and left control shafts (Sensitivity and Band). The rest are round style. See page 2 of the Phantom Deluxe Instruction Manual

Attaching photo:  pinch style,  round, plus the round faster circular tuning knob.

the slower speed tuning knob is a shorter version of the round knob - note the two in profile

,IMG_1024.jpeg

[Fran Mayer]

I was able to get the big tuning knob from these folks for my All Wave 23 a number of years ago. I see he has repro knobs for other models as well.

https://reverb.com/item/66837660-eh-scott-radio-wood-knobs

I was pleased with the knob that I purchased.

Fran

[David C. Poland]

The Walnut Scott repos look very nice. But pretty expensive to buy a set of 7 of those.

Perhaps watch eBay as I have seen them from time to time.

An alternative is the generic brown bakelite used on the earlier Philharmonic and Model 16 and briefly for the 19 tube Phantom. Is pretty much the RCA styles seen at radio swap meets. or the knob lady whose name I forget (Nashville - and attends midwest  radio meets), Or also Renovated Radio's  "Generic" at $12 each for which you could probably brown out the labeled lettering wiping with brown paint.

[Thomas Lager]

Thanks, I'll look into that.