Many thanks to you. She is singing like a bird. Really perky even on a short aerial. She will be living on our landing soon. Thanks again

Frank Goddard Doncaster England.

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: : : : : : : : : : : : : :Sir Frank. . . . . : : : : :How's about considering these additional possibilities: : : : :Starting at the detector 227 stage, are the 10k cathode resistor and its associated capacitor O.K in their values? : : : :No problems with the Phonograph Pick-up Jack and its two connections that are routed into it and then routed out to circuittry, with no corroded contacts with time, or loss of contacts spring tensioning ? : : : :Also, that the .002 ufd "RF stripper" capacitor on the plate circuitry of the detector is good ? : : : :Now for a dynamic testing of the 71 AF output, its 27 AF driver and the 27 detector stages, we will need an .01 ufd capacitor and two test leads ( or one longer one) with their end alli-ma-for-gator clip ends. : : :Note the filament supply line for the 71 and the pilot lamp below it. : : :Take one end of the test lead and clip onto EITHER ONE of the filament supply lines, with the clip leads end and then if the test lead is loooong enough to reach the 1st gridamus of the 71 and both 27's, we are then in business. : : :If coming up short, that is where the second clip lead comes into play to streeeeetch that free .01 lead to the tubes required connections. : : :Fire up ye olde tymes receiver and connect the free end of the .01 cap to the 1st grid of the 71 and confirm that there is 60~ hum. If so, your power feed and operationality of the output stage is in order. : : :Next, move that .01 60~ " Hummmmmmm injector" lead over to the 1st grid of the 27 AF driver amp and see if you are not now now rewarded with even MORE volumes-es-es ! : : :If so we are now home free on two stages. : : :Lastly move ye olde connector-us to the firstus gridamus of the 27 detector stage and see if the speaker doesn't now drive almost into distorted saturation. : : :This prior testing should now confirm an intact power supply feeding to the AF processing circuitry, along with operationality of the sets AF stages. : : : :Confirm winding integity of all RF coils / transformers primaries and secondaries, and that R2 is set to max resistance position across that 3rd RF amp plate coil.(With plate voltages being present on all of their plates also.) : : : :If all is working up to this point, I would expect a 5 metre hank of hook up wire strung across the room and connected to the 1st grid of the 3rf RF "ampli-frier" (just prior to the aforementioned detector stage), to then talk some radio to you now, at some tuning point across the BCB. (Unless you are 'spectin' Brisbane to come rolling into Dorchester !) : : :If no talkee . . . guess we need to check out the detector stage by shunting a 1N34 or 1N60 or 1N270 :germanium diode across the 10K cathode resistor of the 27 detector stage. Orrrrr use the base to emitter junction of a germanium transistor if none of those old diodes are still around from crystal set days / experimentations. : : :Or if you are a more modern day electronics person . . . need I explain about using a silicon 1N914 or IN4148 switching diode . . . common in present day circuitry as sand on the beach . . . figuratively. : : :Try both polarities of diode installation, as one way will have more audio output. : : : :If this makes the detector circuit work, then, go back and confirm plate voltage on all Rf stages as well as stages cathode resistor integrity. : : : :Can't have any serious DC leakage on those frontal RF stages cathode and RF transformer bypassing capacitors either. : : : :Confirm Sir Normans referencing to the 2500/3000/3000/770 and 30,000 voltage divider circuitry associated with the sets B+ and sub B+ supply lines. : : : :Thasssit . . . . .Standing by now for some testing and associative feedback. : : : : : :73's de Edd : : : : :

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::Ed and Norm.
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::Lots to do and check over the weekend. Many thanks. I will be back in touch
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::Frank
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::::Hi Frank
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:::: Is plate (pin #2) voltage on 71A around 170? Does pin #3 when measured to chassis read -30 to -35 volts? If not check tapped wirewound resistor in the power supply.
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:::: Is audio filter at plate of 71A open? Does speaker have continuity?
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::::http://www.nostalgiaair.org/PagesByModel/633/M0040633.pdf
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::::Norm
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:::::Hello Norm.
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:::::No speaker noise when removing the 71 or prev' 27. Tickling the grid and anode of 71 with aerial sounds the speaker as does tickling the anode of 27. All very faint though. No other sounds or noises from next stages back.
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:::::Frank
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:::::Frank.
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::::::Hi Frank
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:::::: We will get there.... Here is a schematic for all to view:
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::::::http://www.nostalgiaair.org/PagesByModel/633/M0040633.pdf
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:::::: When you pull 71A can you hear noise in the speaker? Replace 71A amd pull the tube before this stage. Keep doing this with previous stages.
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:::::: Since this is a TRF radio you can connect the antenna to different RF stages. What happens with antenna connected to detector stage?
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:::::::I brought a Stromberg Carlson 635 back from MA last May and now it is giving me trouble. No sound from the set 2000 ohm speaker - not even a hum?. All HT and LT correct. I have a tuned circuit with no AC applied at the first grid but as mains is switched on the low station volume disapears. No output at the anode of 227 but good HT and tube is good. Any help please . Need to correct this stage before I can move on.
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:::::::FRank Goddard. Doncaster England.
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