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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: FIGHT NIGHT- Sony XDR-F1HD vs EICO 2200 Classic posted by Neff on September 5, 2008 at 16:57:46:
I thought the little Sony was rolled off on both ends and compressed dynamically. Looked at the output stage and there is a 2.2K resistor in series with a ferrite bead. Before the resistor there is a surface mount 2 ufd cap in a 1205 package. Assume it is a low grade ceramic.
Removed the caps and ferrite beads. Replaced them with a 200 ohm resitor in series with a 10 ufd electrolytic. Placed a 75K ohm resistor to ground near the RCA's to bled off dc.
Sound improved a bunch. Better highs, wider dynamics, more solid bass. I might expect the Sony would fare a little better in a comparison if the stock output stage was changed a little.
The caps in series on the output are needed, the supply is single rail. The little surface mount caps and ferrite beads are not helping the sonics in stock form. And chaging the order of the components also may help. I suspect the resistor is placed between the dc blocking ca and the ferrite beads to damp any ringing from having a capacitor and inductor in series. With the beads removed and the inductance supplied by an electrolytic capacitor, the resistor can be placed before the capacitor to make driving the output easier.
BTW my preamp is 8- 9K input. The little Sony is not designed to drive this low value. Course it is just robust as the Eico tube tuner. Suspect the output impedance is high there also.
George
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Follow Ups
- What is it driving? - Panelhead 09/5/0822:21:07 09/5/08 (1)
- RE: What is it driving? - Neff 07:47:37 09/6/08 (0)
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