The Fine Things are Always Hand Made
What schematic best represents the BOL Philharmonic? The schematics I find seem to be for the pointer dial. How much difference is there?
Also, my BOL has had roughly half of the capacitor changed using mostly Solar brand. I presume this was done quite some time ago and was wondering how good these capacitor were/are. The radio works and is quite sensitive, but there are quite a few problems so I'm thinking of recaping the whole thing. I wish I had all of the originals so that I could restuff them!
One other note re: the little 5 pin socket on the back of the later Philharmonics and Phantom Deluxe models:
Later sets in the FM era, the socket was wired to the band switch to control the tweeters, after spring 1940 when the optional 4 unit speaker system was introduced.
But previously, an identical looking small socket was the phono input plug.
So - if your receiver has the little socket, best trace the pin wiring to determine if it is for
1) phono input audio or 2) tweeter control from the band switch.
And always remember - Scott was a custom set builder, and evolution of a model occurred.
Mostly finished! I re-glued many joints in the cabinet and then reinstalled the radio.
I spent many hours playing with the IF alignment using my spectrum analyzer. It was fun seeing the response curve throughout the range of the selectivity control. I found that IF AGC voltage has an affect on the response curve. I experimented with many stations, measuring the AGC voltage. Turns out that the recommended -15 volts works out about the best.
This is the first Philly I've played with. It is awesome! The best sounding radio I have, including the Masterpiece VI with custom speaker system. I've been playing it for several hours now with a signal from my "HIFi transmitter" and computer DAW. Love it! Next is the Garrard turntable.
Is it usual for this radio not to fit the cabinet properly? The radio hangs past the back of the cabinet by about 1/2 inch. Plus, the amp has to have plugs facing to the back rather than toward the speaker or it won't fit without hanging over the edge.
Congrats Rob, nicely done, you now have a problem, nothing else will compare to your philharmonic, they do sound superb.
I have an old auto fm to am converter running on mine, modern FM sounds really nice, you can tell it's not an am transmission,
The variable if on shortwave transmissions is really useful, it's nice to have the facility to adjust the bandwidth and sensivity, at a pinch you can even stop hetrodyning between stations.
Earlier you said that the transformer ran warm, my radio is a 60hz model running on 50hz through an auto transformer to step our 240v to 110v, the transformer runs at a measured 105F,
this is after 3 hours of playing so you could take this as worst case, don't forget the transformer is right next to the rectifiers, there is 60w of heaters there.
Thanks Mike! Yes, I am aware of the heaters next to the tranny. I should get my IR temperature sensor out but I'm not sure how well it will measure on chrome. I could aim it through one of the vent holes. For now, all of my radios are fed by a direct RF connection through my antenna system to my HiFi frequency generator/modulator. It is not a transmitter, rather, it could be used to drive a linear amplifier for a transmitter. It puts out just enough signal to couple to my antenna system to provide all of my radios a fairly weak RF signal. I have tested its frequency response to be at least 20hz to 15k hz. Gives a great sound through all of the "HiFi" radios (Masterpiece VI, this BOL, 37-116 and 38-116 Philcos.) I also have an FM transmitter so that I can receive the program material on my Scott 16A on both the FM band and AM band.
One of the problem I have on all radios of this vintage is getting a good blend of highs, mids and lows. If I get the highs where I want them, the high mids are too pronounced and harsh. The Philly is the best so far because I can play with the sensitivity to get the volume control in an area relative to the tap to get the best balance. The tweeters allow a bit of "shimmer" on snares and cymbals without accentuating the high mids into an area of harshness. I'm liking this radio!!