Полезнейший форум,между прочим:
http://forum.talkingmachine.info/ind...8a81f48e049929
Greg,
I've restored about 15 C-2's and a couple of times I was asked to add a switch so the cap/coil network could be removed from across the volume control, it does help
the DD's but makes 78's really hard on the ears.
A few years ago I decided to test the frequency response of the C-2 amplifier. I had already done this for some RCA amps like the Tomcats.
I used an HP audio generator as the source connected to the input jacks on the radio chassis, terminated the generator with a 1500 ohm resistor to simulate the pickup load and measured the output levels at the output transformer with the speaker connected and with the volume control at max.
The reference level was 1000 Hz. Measured bandwidth was 750 Hz to 2200 Hz
The low frequency -3dB point was 450 Hz, the -6dB point was 350 Hz. The high frequency -3dB point was 5300 Hz and the -6db point was 9500 Hz
The low end roll off was 6dB/octave and the high end roll off was 3dB/octave.
I had planned on doing the same test but including the pickup, using the WE frequency test records as the source, through the amp to the actual speaker output using a
calibrated microphone, but just never got back to that project.
Chuck