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In the Forum: Off Air Audio
In the Thread: A tube tuner? REL Precedent 646C
Post Subject: The crazy REL’s new sensitivity.Posted by Romy the Cat on: 8/21/2008
Play with REL I made other modification the boosted the REL sensitivity to insane level. I modified the way in which my REL delivers antenna’s signal to REL’s front end. Now my REL has BNC ground lifted antenna jack (I tended to use BNC connectors for everything), then a coax that goes directly to frond-end ground right inside of the front end.

REL_FrontEnd.JPG

The signal wire of the coax soldered directly to the second turned of the very first coil (I got rid the entire primary that was there). What a stunning gain of sensitivity it gave!!! Now REL measures 50-70% signal meter on most of the stations with its top off and without any antenna attached. When I put the cover on and close the tuber then I need to attenuate my local stations to 60-50dB (!!!!) to get OK reception. In some case the tune with max out signal get 2-3 stations at the same time and driving the signal doe to 30-40dB I completely get rid of the second station and then another 20dB doe I loosing the noise on the only station the left. So, with this insane sensitivity the REL dives into deep-deep overload and the 5 stages of limiter cannot handle it. Wow! It would be fun if turns out that I need to use my REL with pulled out tubes in IM stage…. Still. Trying to make the new hyper-sensitive REL to behave…

The caT

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