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#1
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For Sale: Grundig Majestic Model 97 dated 1958. Now I think this is
the model that Grundig based it's current solid-state reproduction on, and you'll find advertised in some magazines. Shortwave frequency range: 5.9 to 15.5 mhz as well as AM broadcast and FM. Volume and tuning knobs. Push button tone, band and off switches. 6 sub-miniature tubes. The radio is in beautiful condition and works very well. It was given a complete check and cap overhaul by Midwest Antique Radio Service. However, I do believe he did not leave one of the audio tubes in the tube tester long enough because the audio level does drop off over time. Nothing that isn't easily corrected for $5 to $10 at a nearby hamfest. (Or even from Antique Radio Supply in Tempe.) Just too many radios around my home is the reason I'm selling. Comes with schematic and SAMS photofact info. I will also toss in the check lists from Midwest. First $95 takes it. I will pay for shipping and insurance. Nice classic/antique radio to add to any collection. 73, Bill - WA8MEA 1.517.563.2613 |
#2
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Problem could also be a screen or cathode xistor increasing in value, or a
cathode bypass cap increasing in leakage. All in the audio stage(s, of course). Bill, K5BY |
#3
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Well, since I mentioned Midwest did a cap overhaul. And along with
the cap overhaul they replaced other bad resistors, diodes and such along the way, my FIRST try would be replacing the audio tube. In fact, I would have totally re-tubed the thing myself had it not been for the fact that it has Euro tubes in it, and I liked the idea of keeping it as German as I could. 73, Bill ************************************************** ****************************** (WShoots1) wrote in message ... Problem could also be a screen or cathode xistor increasing in value, or a cathode bypass cap increasing in leakage. All in the audio stage(s, of course). Bill, K5BY |
#4
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Well, since I mentioned Midwest did a cap overhaul.
I read right through that. Sorry. And 'roger' all. Unless they 'cooked' it before returning it, a slow changing resistor may not show up Also, I wonder if the B+ is decreasing? Sometimes a resistor instead of a choke is used in a power supply's pi filter. Also, if there is a C- source for an audio stage grid's bias, that voltage DEcreasing may reduce gain. The stage will drop to a lower gain type A instead of, say, a type AB1 amp. Just some thoughts. Bill. K5BY |
#5
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Here is it:
http://www.mikesradio.freeservers.com/grundig_97.htm BIG is beautiful SMALL is expensice. 73 de S57BIG (Grundig Yacht boy 400 + Grundig Yacht boy 500) WShoots1 wrote: Well, since I mentioned Midwest did a cap overhaul. I read right through that. Sorry. And 'roger' all. Unless they 'cooked' it before returning it, a slow changing resistor may not show up Also, I wonder if the B+ is decreasing? Sometimes a resistor instead of a choke is used in a power supply's pi filter. Also, if there is a C- source for an audio stage grid's bias, that voltage DEcreasing may reduce gain. The stage will drop to a lower gain type A instead of, say, a type AB1 amp. Just some thoughts. Bill. K5BY |
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