EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

Discussed in the article below is the merits of added resistance to the IF grid circuits behind the 6F6 tubes. Any opinions ?

https://www.radiomuseum.org/r/scott_radi_philhamronic.html

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Richard is the only person I know of thus far who has had issues. 

If your radio is performing fine, leave it alone.  If you have some problems, post them here and we will do what we can to help.

Dave;

Using Norman Braithwaite's instructions is the way to go, nice and easy to follow,

don't forget to disable the agc first.

You can use a wobbulator, the way I did, but you have to take into account the variable IF bandwidth,

there is enough gain around the IF strip to get feedback, but this will only happen if the alignment is out,

I agree with Scott, I was tempted to try the grid resistors during my restoration,

but as the radio works so well anyway, I left the chassis alone.

Mike

Thanks fellas. Could you direct me to Norman’s tips ?

I concur, if the set is working well, and it aligns smoothly using Norman's instructions, then don't make changes. I've never had issues with a Philly following the steps discussed here. 

Kent

Thanks Kent. Noticed Scott has offered clear pictures of Philly schematics, so friended him in hopes of obtaining such. From notes within, I’ve determined my AM BOL is a 39, about when things were on the move. Pedestal speaker and round estrucheons still present before the move to FM. Believe the 39 also first with logging scale.

My one issue with this previously recapped chassis is the selector switch at “phono” (fully CW) position. There’s broadcast bleeding thru.

The only phono pinout ( no towers) is the small square 5 pin at rightmost rear of receiver. I want to intercept phono output there but the pin holes are of odd ID. If tried early speaker pins ( too small) and vintage phonograph commecs (to large), perhaps it’s best to intercept output within and drop a line out.

Dave:

The five pin plug and socket used on the Philharmonic was a popular style used for phonographs into the 1960s.  It should not be hard to find a correct plug.  They came in two types, phenolic wafer holding pins with metal shroud and molded black bakelite.

Norman

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