03-26-2018, 10:44 AM
Hi Mike,
So what size spkr would mount inside the cabinet? The K spkr is an 8" and the H is 10 1/2". The 87 and 89 are two very different from each other (87 is from 1929 and the 89 is from 1934).
The 37-650 has whats called a push/pull 6F6 output stage which requires a transformer will match about 14,000 ohm to the 2 ohm voice coil. This is a common configuration on Philco sets. The other consideration is the field coil. It's 450 ohms but the resistance isn't very critical as it doesn't determine the bias voltage. What is important is coil's current rating. Spkr info can be found here: Look for speaker zip file.
http://philcoradio.com/phorum/showthread.php?tid=215
GL
So what size spkr would mount inside the cabinet? The K spkr is an 8" and the H is 10 1/2". The 87 and 89 are two very different from each other (87 is from 1929 and the 89 is from 1934).
The 37-650 has whats called a push/pull 6F6 output stage which requires a transformer will match about 14,000 ohm to the 2 ohm voice coil. This is a common configuration on Philco sets. The other consideration is the field coil. It's 450 ohms but the resistance isn't very critical as it doesn't determine the bias voltage. What is important is coil's current rating. Spkr info can be found here: Look for speaker zip file.
http://philcoradio.com/phorum/showthread.php?tid=215
GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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