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June 07, 2010

Comments

Andreas

This Grundig is a re-labeled Koyo KTR-1770. Don't know why Grundig's marketeers hat this strange idea...

Maybe it might be worth the money as a rare collector's item, I don't know and I don't care. But be aware that it's a mediocre performer. Not really bad, but not a competitor to the best transistor radios of it's time...

A word to the men with the solder irons: it's not easy to get a schematic of this radio on the web...

See more here
http://www.radiomuseum.org/r/koy_ktr_1770ktr177.html

Jeffrey McMahon

Andreas, thanks for the heads up. Jeff

Keith Beesley

I agree w. Andreas. I had one of these and it's an odd bird. Looks very impressive and built like a tank, but performance was not that impressive.

brandon

Its poor performance is actually documented in its owner manual - if you look at the specs you'll see that its AM sensitivity is rated at 200uv/m and FM at 15uv - comparatively speaking, the good Panasonic portables are about 8x more sensitive on both bands. That seems odd to me that they would make such a nice looking and well-built radio with such poor performance.

Andreas

Just as an addition to Keith and brandon:

The main problem of this radio - I'm generally speaking about SW - is that it's prone to overload. Image rejection is only fair. Unfortunately among all the switches and controls you won't find an attenuator or RF-gain-control to handle these problems. That's a pity.

The scale may look impressive - but you only can guess the frequency. Sony ICF-5900 and Pana RF-2200 from the same time follow much better concepts here. The good news: Selectivity is o.k. for broadcast listening.

Don't get me wrong: It's a nice radio if you just wan't to listen to the major international broadcasters and some hams from your neighborhood on 80m. But always be aware of overload. So it's a an extremely good idea to use a selective antenna with this radio.

Buy one for 30 or 40 bucks, take it to your weekend cottage, listen to the weather forecast, try some mods, and you can have a lot of fun with it. But 250 bucks? Maybe if it was the very very last radio which your collection has been lacking ;)


BENONI

tHE GUY THAT SAID THAT THE grundig tr 807 IS A PORE PERFORMER HAS NO IDEA WHAT IS HE TALKING ABOUT!
i COMPARED THIS GRUNDIG WITH THE panasonic rf 2200 and THE MAGNAVOX 2999 AND THE sony 5100(WHICH IS BETTER THAN zenith 7000) and all ARE WAY LESS SENSITIVE THAN THE TR807 ON THE SHORT WAVE BANDS
fOR EXAMPLE THERE IS A STATION IN PHOENIX az THAT i GET HARD IS ABOUT AT 5970 KHZ (OR 5940) THE Panasonic rf2200 and the MAGNAVOX 2999 requires a antenna amplifier ( +20db) to sound the same as the GRUNDIG tr807 sounds WITH NO ANTENNA AT ALL
DO YOU GUYS GET THAT? THE ANTENNA IS PUSHED IN ALL THE WAY in the tr807 and is so sensitive that it puls the signal as good as the MAGNAVOX 2999 DOES IT WITH A LONG WIRE ANTENNA PLUS THE 20db antenna amplifier!!!!

Benoni Visinescu

AND it is true that it is very easy to over load the first rf stages BECAUSE IS INCREDIBLE SENSITIVE!The rf gain is huge with no rf gain control so as SOON AS YOU PULL THE ANTENNA UP the SW station(ex.5935 khz) is fooded with static due to saturation of the rf amplifier. IT IS WRONGLY MISSDIAGNOSTIC WITH A LOW SENSITIVITY BECAUSE IN THIS MODE(antenna up) the rf satges are saturated by the rf noise! I discover this by mistake; first I did not get anything except noise(so it seems that was very pore performer) than I removed the back cover and remove the antenna cable from the antenna: SUDDENTLY ALL THE SW BANDS CAME ALIVE STRONG AND WITH A GREAT NOISE SIGNAL RATIO!!!THIS GRUNDIG (with out the antenna) is very quiet in between the SW stations and comes strong exactly at the station WITH A VERY HIGH SELECTIVITY (controled by the "FINE TUNNING BUTTON)
I never found an other radio that is so controversial in operation performance.
THIS GRUNDIG(with no antenna ,just the 6 inch wire that is build inside that goes from the board to the antenna;leave the end that supose to be hooked to the antenna ,in air, not connected to anything) CAN BEAT IN SENSITIVITY AND SELECTIVITY AND SIGNAL /NOISE RATIO THESE RADIOS:MAGNAVOX 2999, PANASONIC RF 2200, SONY 5100, ZENITH 7000, GRUNDIG 700.
I tried to connect just a small wire (at the end of the wire that comes from the bord and goes to antenna )insted of the long antenna AND AS SOON AS I TOUCH the wire THE STATIC FLOODS THE SW STATION!!
SO THAT 6INCH WIRE IS the only lenght that DOES NOT SATURATE THE RF STAGES! IT IS ABSOLUTELY AMAZING!

Phil Ireland

I have recently picked up the Grundig TR-807. I find the radio hypersensitive and extremely prone to FM breakthrough. I think a Low Pass Filter is required in the AM input circuit. Would be interested if anyone has done such a mod.
A great radio although not up to the overall performance of some of the better Japanese offerings of the era.

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