Denon TU 800

kapibara · 29 Maja 2007

Co sądzicie o tunerze Denon TU 800?

Jak się on ma do tunera denon TU 660?

30 Maja 2007

Denon TU-800

A black-faced digital tuner, the TU-800 was a Stereophile favorite that was compared to the Onkyo T-9090 and "enthusiastically recommended." It has 3 IF bandwidth settings (Wide/Narrow/Super Narrow) like the Onkyos, and 8 ceramic filters. There are 2 filters in Wide, 2 more added for Narrow (4 total), then a totally different path with 4 different filters for Super Narrow. The TU-800 is better-sounding than the T-9090, but our panelist Eric had a unit that was out of alignment so its sensitivity and selectivity were not up to spec. When our panelist Bob got that TU-800 to work on, he "noticed the MPX filter does nothing - then I reread Don Scott's review, and he said the same thing." After tweaking a second TU-800, Bob called it "an incredible tuner for selectivity, sensitivity and sound, when working correctly. It beat the pants off a new Fanfare." Here's Bob's description of the circuit path: "After the antenna input, there is a tuned varactor stage, then a dual-gate MOSFET, then two more tuned varactor stages, then the mixer, a dual-gate MOSFET. After the mixer is an IF transformer, then a real nice touch, two FETs in parallel driving the first ceramic filter. In the linear oscillator, there is a tuned varactor generating the LO, followed by a FET buffer, followed by another tuned varactor stage, and then this signal drives the LO input on the mixer. So I count 5 gangs total, with 2 in the LO area, so it's the equivalent of 4 gangs by the 'traditional' count." The detector is a phase-locked loop type that is shared by the Wide/Narrow and Super Narrow IF paths. Rarely seen on eBay, the TU-800 usually sells for $150-225, with a recent low of $89 in 5/06. [bF][EF][EH]

Ja tylko dodam ze TU 660 o ktorego pytales na privie to model brzmiacy dosc jasno o detalicznie - najwyzszy z katalogu 1990 a wiec mlodszy od 800 ale tez i tanszy o okolo 150 USD. Tu masz zdjecie TU 800: