I replaced all 24 paper and electrolytic capacitors in this set. Am works great. But there's on sound at all from the FM tuner whatsoever. I suspect the discriminator diodes in the 6S8. But I don't have a spare and I don't have any 1N34As handy. There's no FM hiss either. I think I should hear that.
I'll look at it for a while and order the tube and some spare 1N34As. I think that could be it.
I usually prefer a separate mixer and oscillator tube for FM. But they didn't do it that way. I tried a different 6BE6, just in case it couldn't oscillate at the higher frequency. But that's not the problem. If anyone knows where I should look for the problem, please let me know.
Thanks,
Dave
: I replaced all 24 paper and electrolytic capacitors in this set. Am works great. But there's on sound at all from the FM tuner whatsoever. I suspect the discriminator diodes in the 6S8. But I don't have a spare and I don't have any 1N34As handy. There's no FM hiss either. I think I should hear that.
: I'll look at it for a while and order the tube and some spare 1N34As. I think that could be it.
: I usually prefer a separate mixer and oscillator tube for FM. But they didn't do it that way. I tried a different 6BE6, just in case it couldn't oscillate at the higher frequency. But that's not the problem. If anyone knows where I should look for the problem, please let me know.
:
:
:Thanks,
:
:Dave
:
Sir Dave Efffffff. . . .
Since this sets FM section is a full blown unit . . . .even resplendently incorportating a limiter stage.
Try This One:
Monitor across the 100 k grid resistor of the limiter stage.
If you have good converted FM coming down the IF pipeline, a negative voltage will be developed across that resistor in accordance to the strength of the incoming signal.
Tune across the FM band checking that out . . . and concentrating on the strongest stations.
To check out the possibility of defunt diodes in the 6S6, shunt across its units, 3A-5K and 4A-2K using modern day silicon diodes akin to the 1N 914---916 or even the newer1N4148 series . . . . . plentiful in all electronics nowadays where they are using a silicon diode .
Radius Shackamus also has them.
There is plenty adequate RF level for them to conduct . . . . considering the fierce LOSS across the thermionic diodes, which it is using otherwise !
73's de Edd
In my humble estimation . . . .Any line, however short, is still too long.
No matter how I tune the FM it's -0.226 volts across the 100K ohm resistor. FM is quite dead.
Now what?
Thanks,
Dave
::Hello All,
:: I replaced all 24 paper and electrolytic capacitors in this set. Am works great. But there's on sound at all from the FM tuner whatsoever. I suspect the discriminator diodes in the 6S8. But I don't have a spare and I don't have any 1N34As handy. There's no FM hiss either. I think I should hear that.
:: I'll look at it for a while and order the tube and some spare 1N34As. I think that could be it.
:: I usually prefer a separate mixer and oscillator tube for FM. But they didn't do it that way. I tried a different 6BE6, just in case it couldn't oscillate at the higher frequency. But that's not the problem. If anyone knows where I should look for the problem, please let me know.
::
::
::Thanks,
::
::Dave
::
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Dave Efffffff. . . .
:
:
:Since this sets FM section is a full blown unit . . . .even resplendently incorportating a limiter stage.
:
:
:Try This One:
:
:
:Monitor across the 100 k grid resistor of the limiter stage.
:
:
:If you have good converted FM coming down the IF pipeline, a negative voltage will be developed across that resistor in accordance to the strength of the incoming signal.
:
:
:Tune across the FM band checking that out . . . and concentrating on the strongest stations.
:
:
: To check out the possibility of defunt diodes in the 6S6, shunt across its units, 3A-5K and 4A-2K using modern day silicon diodes akin to the 1N 914---916 or even the newer1N4148 series . . . . . plentiful in all electronics nowadays where they are using a silicon diode .
:
:
:Radius Shackamus also has them.
:
:
:There is plenty adequate RF level for them to conduct . . . . considering the fierce LOSS across the thermionic diodes, which it is using otherwise !
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:In my humble estimation . . . .Any line, however short, is still too long.
:
:
:
:
:
:
:
:
:
:
:
:
: No matter how I tune the FM it's -0.226 volts across the 100K ohm resistor. FM is quite dead.
:
: Now what?
73's de Edd :
Now what? ? ? ? ? ?
Why . . .you usually have answered and solved your problems on your own by now ?
But t t t t . . . you now can proceeeeed to the firstus gridamus of the mixer stage of the unit and inject raw 10.7 IF signal into the strip.
Then monitor the limiter stage as before and then play with the level of signal generator RF output to see and create the mentioned voltage variance.
If no luck, probable possibility that your converter is not converting or your mixer is not mixing, IF all Plate and Screen B+ supplies are being up to par.
You could also then proceed to any stages first, JUST prior to the limiter stage, to inject 10.7 RF signal to see if they might be the ones not passing on the IF signal.
Thasssittt . . .
:Thanks,
:
:Dave
:::Hello All,
::: I replaced all 24 paper and electrolytic capacitors in this set. Am works great. But there's on sound at all from the FM tuner whatsoever. I suspect the discriminator diodes in the 6S8. But I don't have a spare and I don't have any 1N34As handy. There's no FM hiss either. I think I should hear that.
::: I'll look at it for a while and order the tube and some spare 1N34As. I think that could be it.
::: I usually prefer a separate mixer and oscillator tube for FM. But they didn't do it that way. I tried a different 6BE6, just in case it couldn't oscillate at the higher frequency. But that's not the problem. If anyone knows where I should look for the problem, please let me know.
:::
:::
:::Thanks,
:::
:::Dave
:::
::
::
::
::
::
::
::
::
::
::
::
::
::
::
::Sir Dave Efffffff. . . .
::
::
::Since this sets FM section is a full blown unit . . . .even resplendently incorportating a limiter stage.
::
::
::Try This One:
::
::
::Monitor across the 100 k grid resistor of the limiter stage.
::
::
::If you have good converted FM coming down the IF pipeline, a negative voltage will be developed across that resistor in accordance to the strength of the incoming signal.
::
::
::Tune across the FM band checking that out . . . and concentrating on the strongest stations.
::
::
:: To check out the possibility of defunt diodes in the 6S6, shunt across its units, 3A-5K and 4A-2K using modern day silicon diodes akin to the 1N 914---916 or even the newer1N4148 series . . . . . plentiful in all electronics nowadays where they are using a silicon diode .
::
::
::Radius Shackamus also has them.
::
::
::There is plenty adequate RF level for them to conduct . . . . considering the fierce LOSS across the thermionic diodes, which it is using otherwise !
::
::
::
::
::
::73's de Edd
::
::
::
::
::
::In my humble estimation . . . .Any line, however short, is still too long.
::
::
::
::
::
::
::
::
::
::
::
::
:
:
I have an EICO 369 TV-FM Market Generator with an RF Output on it. If that will work, I'll do the tests and find the faulty components. I don't usually have to do this because FM always ends up working. This is something interesting. I'll try it and let you know what I find.
Thanks,
Dave
::Edd,
:: No matter how I tune the FM it's -0.226 volts across the 100K ohm resistor. FM is quite dead.
::
:: Now what?
:
:
:Now what? ? ? ? ? ?
:
:
:
:
:Why . . .you usually have answered and solved your problems on your own by now ?
:
:
:But t t t t . . . you now can proceeeeed to the firstus gridamus of the mixer stage of the unit and inject raw 10.7 IF signal into the strip.
:
:
:Then monitor the limiter stage as before and then play with the level of signal generator RF output to see and create the mentioned voltage variance.
:
:
:If no luck, probable possibility that your converter is not converting or your mixer is not mixing, IF all Plate and Screen B+ supplies are being up to par.
:
:
:You could also then proceed to any stages first, JUST prior to the limiter stage, to inject 10.7 RF signal to see if they might be the ones not passing on the IF signal.
:
:
:Thasssittt . . .
:
:
:
:73's de Edd
:
:
:
::
::Thanks,
::
::Dave
::::Hello All,
:::: I replaced all 24 paper and electrolytic capacitors in this set. Am works great. But there's on sound at all from the FM tuner whatsoever. I suspect the discriminator diodes in the 6S8. But I don't have a spare and I don't have any 1N34As handy. There's no FM hiss either. I think I should hear that.
:::: I'll look at it for a while and order the tube and some spare 1N34As. I think that could be it.
:::: I usually prefer a separate mixer and oscillator tube for FM. But they didn't do it that way. I tried a different 6BE6, just in case it couldn't oscillate at the higher frequency. But that's not the problem. If anyone knows where I should look for the problem, please let me know.
::::
::::
::::Thanks,
::::
::::Dave
::::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Sir Dave Efffffff. . . .
:::
:::
:::Since this sets FM section is a full blown unit . . . .even resplendently incorportating a limiter stage.
:::
:::
:::Try This One:
:::
:::
:::Monitor across the 100 k grid resistor of the limiter stage.
:::
:::
:::If you have good converted FM coming down the IF pipeline, a negative voltage will be developed across that resistor in accordance to the strength of the incoming signal.
:::
:::
:::Tune across the FM band checking that out . . . and concentrating on the strongest stations.
:::
:::
::: To check out the possibility of defunt diodes in the 6S6, shunt across its units, 3A-5K and 4A-2K using modern day silicon diodes akin to the 1N 914---916 or even the newer1N4148 series . . . . . plentiful in all electronics nowadays where they are using a silicon diode .
:::
:::
:::Radius Shackamus also has them.
:::
:::
:::There is plenty adequate RF level for them to conduct . . . . considering the fierce LOSS across the thermionic diodes, which it is using otherwise !
:::
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::In my humble estimation . . . .Any line, however short, is still too long.
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
::
::
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: