Audiofiele tuner Denon TU 800
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Dynamic Twin Drive Demodulator
Bruikbare gevoeligheid: 0,8 uV (9,3dBf) (DIN)
Kanaalscheiding: 60 dB ( 1kHz)
Signaal ruis verhouding : Mono 96 dB, Stereo 92 dB (IHF-A)
Ca. 5 FM gangen
8 ceramic IF filters !! (wide/narrow/super narrow)
one DX'er commented "the most sensitive tuner he's ever seen"
zeer nauwkeurige sterkte-aanduiding
verder zeer veel mogelijkheden
Uitmuntende klank- en ontvangsmogelijkheden
Denon TU-800 (1988, $500, photo) search eBay
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. Our panelist Bob now has that TU-800 to work on and says it shows promise, but he noticed the MPX filter does nothing - then I reread Don Scott's review, and he said the same thing. 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.