Temple G418 No sound from lower band

10/3/2013 9:13:41 PMGreg

Hi, I am working on a Temple G418. The radio has been recapped and all tube are good. I get stations at mid to upper bands but get nothing on the lower bands. The schematic on this site does not call out voltage specs. Can anyone help?

Thanks

10/3/2013 9:33:22 PMCV

You might examine both sections of the tuning capacitor very carefully as you rotate it fully meshed- do the plates touch at some point, due to a bent plate or nicked plate edge? If a short between stator and rotor is happening at some point on either section, it will kill reception. Because the plates engage more fully at low frequencies, a short like this is more likely to take out the lower tuning range.

10/7/2013 6:36:25 PMGreg

:You might examine both sections of the tuning capacitor very carefully as you rotate it fully meshed- do the plates touch at some point, due to a bent plate or nicked plate edge? If a short between stator and rotor is happening at some point on either section, it will kill reception. Because the plates engage more fully at low frequencies, a short like this is more likely to take out the lower tuning range.
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Hi CV, No such luck. I remove and chacked the tuning capacitor. There were no shorts. The plates are super straight.

10/7/2013 7:04:11 PM*** Edd ***

Sir Greg . . . .

Vell its dun bin lookink dat der mentioned easy fix . . . vas not der solution. . . .

Leaky C-5 or Gassy 35L6 . . . anyone ?

Place a VTVM or a digital voltmeter on the 1st grid of the 12SA7, in DC mode for metering

in the ~5-8V spectrum and fire up the set and take note of the voltage:

1 . . . at the high end of the AM band

2 . . . .at the low end of the AM band

and most importantly, if it shifts or drops out somewhere between in the making of a full across band tuning sweep.

73's de Edd

I found there was only one way to look fashionably thin, just hang out with fat people.

::You might examine both sections of the tuning capacitor very carefully as you rotate it fully meshed- do the plates touch at some point, due to a bent plate or nicked plate edge? If a short between stator and rotor is happening at some point on either section, it will kill reception. Because the plates engage more fully at low frequencies, a short like this is more likely to take out the lower tuning range.
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:Hi CV, No such luck. I remove and chacked the tuning capacitor. There were no shorts. The plates are super straight.
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10/12/2013 2:54:12 PMgREG

Turned out that is was 3 bad resistors. The radio is happy again. Thank you :)

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:Sir Greg . . . .
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:Vell its dun bin lookink dat der mentioned easy fix . . . vas not der solution. . . .
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:Leaky C-5 or Gassy 35L6 . . . anyone ?
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:Place a VTVM or a digital voltmeter on the 1st grid of the 12SA7, in DC mode for metering
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:in the ~5-8V spectrum and fire up the set and take note of the voltage:
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:1 . . . at the high end of the AM band
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:2 . . . .at the low end of the AM band
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:and most importantly, if it shifts or drops out somewhere between in the making of a full across band tuning sweep.
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:73's de Edd
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:I found there was only one way to look fashionably thin, just hang out with fat people.
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:::You might examine both sections of the tuning capacitor very carefully as you rotate it fully meshed- do the plates touch at some point, due to a bent plate or nicked plate edge? If a short between stator and rotor is happening at some point on either section, it will kill reception. Because the plates engage more fully at low frequencies, a short like this is more likely to take out the lower tuning range.
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::Hi CV, No such luck. I remove and chacked the tuning capacitor. There were no shorts. The plates are super straight.
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