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Zenith 15U270
#7

Two 15 tubers side by side!  Tonally, with a hifi transmitter, the 37-116 has the advantage.  Better extended treble even though the Zenith has a tweeter.  Interestingly, if I detune the Zenith slightly, the high frequency response improves.  I think I'll put it on the spectrum analyzer and see if I can broaden the IF by stagger tuning the transformers slightly.  The analyzer gives a good picture of what is happening.  I'll also analyze the tone control circuit to see if I can change a couple of values to improve response.  I'm not overly impressed with Zenith's system!  Ya gotta love the dial though.  Only problem is the dial light does a nice job of lighting the black trim but not the dial.

The curved veneer problem that I need to deal with is obvious.  (Oops!  That photo is upside down). Any experts out there with advice?

           


Messages In This Thread
Zenith 15U270 - by rfeenstra - 05-31-2020, 04:45 PM
RE: Zenith 15U270 - by rfeenstra - 05-31-2020, 04:54 PM
RE: Zenith 15U270 - by morzh - 05-31-2020, 06:10 PM
RE: Zenith 15U270 - by rfeenstra - 05-31-2020, 08:06 PM
RE: Zenith 15U270 - by morzh - 05-31-2020, 08:39 PM
RE: Zenith 15U270 - by Eliot Ness - 06-01-2020, 08:07 AM
RE: Zenith 15U270 - by rfeenstra - 06-04-2020, 08:12 PM
RE: Zenith 15U270 - by sdradioman - 06-05-2020, 07:06 AM
RE: Zenith 15U270 - by rfeenstra - 06-05-2020, 10:12 PM
RE: Zenith 15U270 - by morzh - 06-05-2020, 11:44 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 10:46 AM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 11:23 AM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 06:23 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 08:56 PM
RE: Zenith 15U270 - by rfeenstra - 06-06-2020, 09:47 PM
RE: Zenith 15U270 - by Phlogiston - 06-06-2020, 10:34 PM
RE: Zenith 15U270 - by rfeenstra - 06-09-2020, 09:14 PM
RE: Zenith 15U270 - by PhilcoJohn - 06-10-2020, 08:27 AM
RE: Zenith 15U270 - by Phlogiston - 06-11-2020, 11:32 AM
RE: Zenith 15U270 - by rfeenstra - 06-11-2020, 03:31 PM



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