The radio seems to have less output than comparable radios. I did align it with an SG and output meter. The output has improved since I replaced the dried out grommets under the tuner mounting posts.

The voltages are all about 10% higher than called for, but the power transformer is not original.

I think this radio is probably working as well as it can.

Bud

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: : : : : : : : : : : :Sir Bud R. . . . . : : : :Well once again I have met the enemy and it is me. : : : :Sooooooo . . . . . it is not solely Pogo . . . falling into that category ! : : : : : The radio plays okay now, though it is not exceptionally sensitive. : : : :Want to continue on analyzing the deficiency still present ? : : :If so, initially fill us in more fully on that aspect. : : : :I interpret that as not picking up as many stations as another TUBED radio that is sitting beside it and being used as a benchmark. (But,not one with an RF stage in front of it. ) : : :Or would you say that the Emerson picks up just as many stations but just doesn't seem to have the overall gain and volume as the other set? : : :Your initial semantics of : : : : :and did a rough alignment by ear. : : : :Sort of suggested to me that you did not have a signal generator . : : :The 455/456 I.F. transformers, if all having trimmer capacitors for their adjustmens should all come into a peak and a decline if tuned off from that, with the latter stage transformers showing the broader tuning. : : :ZUJ'ing for feedback. : : : : : :73's de Edd : : : :

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::Well once again I have met the enemy and it is me.
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::In untangling the rat's nest, which was not caused by a rat but by a repairmen obviously even more amateurish than me, I connected the B+ line to the 2B7 on the wrong side of the 10K resistor that feeds the rest of the plates in the radio.
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::I don't know how I didn't catch this during the 7 times I went over the B+ line, I guess I just thought the 100K resistor had drifted a little high when I measured resistance from the 80 filament to the 2B7 plate.
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::The radio plays okay now, though it is not exceptionally sensitive. I'm a little suspicious of the 2nd IF as it does not peak much. All three of the IF cans in the radio are different and I don't think any of them are original. Perhaps the 2nd IF is not 456K.
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::Thanks for all the help and the great mark up. You guys are the best.
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::Bud
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::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::Sir Bud R. . . . . . ::: ::: ::: :::Looks like that sets circuitry could be made to work with the two winding IF transformer, the part you are missing is just a capacitive "wire" gimmick associated with one of the windings. Much as you see being done with an oscillator coil , instead using a separate discrete coupling capacitor. ::: ::: :::All in all . . .with the effective circuit possibly doing a bit of " double dipping " as was seen in older TRF circiutry where the circuit could be using grid detection, RF amplification, run thru again for audio amplification and finally take off the amplified audio . ::: ::: ::: :::PROCEDURE: ::: ::: :::Consult my mark up of the set below and initially power up the set and re-confirm that VEWY-VEWY low level of B+ on the plate of the 2B7 again. ::: ::: :::Its a miracle . . .ITS A MIRACLE . . . THERE IS NOW 88 VOLTS THERE ! . . . nope ? O.K . . .well then . . . . . now how about . . . ::: ::: ::: :::Lets go ahead and unplug the 2B7 and thereby have no loading being presented upon that plate B+ supply feeding that specific circuitry. ::: ::: :::Then meter up at the plate of the 2B7 and now see which of two conditions are present, either an APPRECIABLY higher level of B+ now being present or the SAME-o-SAME- o . . . LOW . . . B+ level that you were just experiencing. ::: ::: :::If you are finding that same low voltage level, start down at the power supply and measure upwards thru the sequential series feeding components. ::: ::: :::You can see that the supply initiates down at the power supply and passes up for that initial voltage drop thru the 100 K resistor, then there is a pi network series filter of an inductor and its side 250 pf companion elements. ::: ::: :::So, see if that inductors past history has possibly experienced some "rat pith" being deposited upon its winding and had the typical corrosive reaction and eating away at wire / connection and leaving an open circuitry and only the dormant alkaline deposit leaving a high resistance series path. ::: ::: (AKA 2 volts B+ plate supply voltage . . baby cakes.) ::: ::: :::However, if that inductor is reading in the low ohms then, now a remote possibility, but,also consider and test for leakage to ground of the 250 PF caps and the other possibility of the tied in .02 coupling capacitor to the AF outputs 1st grid being leaky. ::: ::: ::: :::Sort of having to stand by for your findings . . . now . . . in order to see which of the developing 8 forks in the road that we have to proceed ahead on. . . . . . ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: :::

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::::Hi Bud
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:::: The 2B7 plate is supplied through a 100K resistor. If the screen of this tube has too much voltage it will cause plate to draw more current and drop the reading. Be sure the 15K resistor from G2 (screen) to ground is in place.
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:::: Is the 2K cathode resistor in place? Cathode should be slightly positive. If not the tube will draw more current causing plate voltage to be low.
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::::http://www.nostalgiaair.org/PagesByModel/588/M0004588.pdf
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:::: Any chance the .02 mf from 2B7 plate to #47 grid is leaky?
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::::Norm
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:::::Good morning,
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:::::I'm trying to restore this radio, it's in Rider's, page Emerson 5-5.
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:::::Someone many years ago got in it an made a complete rat's nest out of it. I've got everything back , replaced all the caps except the micas, and did a rough alignment by ear.
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:::::The radio plays, but weakly. I can see the source of the problem, I only have 9 volts at the plate of the 2B7, schematic calls for 115 volts. All my other plate and screen grid voltages are good. I've substituted the 2B7 with a couple others, no change in the voltage.
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:::::I can't find any problems in the 2B7 circuits other than the IF transformer is not original. The original was single tuned and had three windings, one of which attached to the cathode. The replacement is a standard IF can with two trimmers. It doesn't seem like this would effect the plate voltage, but I've run out of ideas.
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:::::Can anyone offer some advice or insight?
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:::::Thank you all.
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:::::Bud
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