Tuner DX ONKYO INTEGRA T 4670 ( tuner Onkyo 4700 ) impecabil

ONKYO INTEGRA T-4670 ( 4700 ) cap serie. Tuner DX !

POZA REALA!

Absolute Spitzenklasse (Stereoplay).40 Canale. random preset,antena A,B,APR operation,RF mode,IF band,hi-blend,multi function display,variable out,remote senzor.  Absolut Impecabil! Made in JAPAN.
Ofer si schema electronica

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The T-4700, a black digital FM-AM tuner and the scarcer big brother of the T-4500, is another typically superb DXing tuner from Onkyo. It has a very complicated front end, as our panelist Bob explains: "From the schematic, you can see there are two gangs before the metal can, which are switched in or out of the circuit with diodes, controlled by a local/DX switch. The 'local' setting would add the two gangs. Then, there are another two gangs, an RF amp, another two gangs, then a mixer. There is one gang used in the oscillator. This totals 5 gangs in DX mode, 7 in Local mode. Recall that an RF gang, besides being a bandpass filter, has loss. The extra two gangs would be like inserting a tuned attenuator in front of a normal 5-gang tuner. The 4 tuned gangs before the RF amp would seem to be a really decent design to prevent front end overload in areas with big local transmitters. I've never seen that design before (normally there are one or two gangs before the RF amp), but it makes sense."

The T-4700 has 6 ceramic filters, two of which have a narrow 150 kHz bandwidth for the Narrow IF bandwidth mode. The T-4700 tunes in either .5 MHz or .25 MHz steps, and has a remote control. Jim's description of the T-4500's features applies as well to the T-4700, which also has a front-panel output level knob, dual antenna jacks, adjustable muting level, and the ability to input names for stations - in fact, Jim would be pleased to count 44 buttons and one knob on the T-4700's front panel. Despite their similar exteriors, the T-4700 is quite different from the T-4500 inside, with a much larger and more sophisticated circuit board. With a couple of matched 110 kHz filters installed, the T-4700 would probably be a world-beater for DXing, on par with a T-9090 or T-9090II. The T-4700 and T-4500 are more intelligently designed than the T-9090s, however, with their 40 presets and related buttons grouped together to allow the 'APR' function buttons to be laid out more logically.