Many thanks,
Jon.
Thanks,
Jon.
There will be a cap across secondary of your vibrator transformer. It's important to replace this buffer cap with one of the same value and at least as high voltage. This caps keeps vibrator point spikes to a minimum.
You can use a vibrator with 4 pins but some 5 pin types have a second set of points to rectify secondary voltage. If this is a case you can add a couple silicon diodes as rectifiers.
Vibrator hash is hard to eliminate. Radios with vibrators have extra filter caps on the primary to reduce hash.
Norm
:Continuing to work on this radio and have replaced the capacitors that are integral in the vibrator(.5 mfd). It produces lots of "hash" and noticed that the contacts arc a little.The contacts look like they are pitted and it looks like someone in the past has bent the contact arms to do some sort of adjustment Is this normal or is this what is causing the hash? Should I increase the value of the caps? All other caps have been replaced. The vibrator is a Mallory type 275 5 pin. Are 5 pin replacements available as I have only seen 4 pins in the catalogs.
:Many thanks,
:Jon.
:Thanks,
:Jon.
Did you ever come back with the info relevant to the
amount of B+ voltage that you have being created and being fed to the plates of the AF output and earlier AF tube stages? As well as the audio stages actually amplifying signal. They could be stone dead and inhibiting any signal passage and your still getting
that hash noise merely from the primary of the AF output transformer.
73's de Edd
73's de Edd
:Continuing to work on this radio and have replaced the capacitors that are integral in the vibrator(.5 mfd). It produces lots of "hash" and noticed that the contacts arc a little.The contacts look like they are pitted and it looks like someone in the past has bent the contact arms to do some sort of adjustment Is this normal or is this what is causing the hash? Should I increase the value of the caps? All other caps have been replaced. The vibrator is a Mallory type 275 5 pin. Are 5 pin replacements available as I have only seen 4 pins in the catalogs.
:Many thanks,
:Jon.
:Thanks,
:Jon.
:
:Did you ever come back with the info relevant to the
:amount of B+ voltage that you have being created and being fed to the plates of the AF output and earlier AF tube stages? As well as the audio stages actually amplifying signal. They could be stone dead and inhibiting any signal passage and your still getting
:that hash noise merely from the primary of the AF output transformer.
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:73's de Edd
:
:
:
: Edd,
Voltages are o.k. they do seem to be not very stable, jumps up and down 10-20 volts. I am getting reception but the vibrator noise is so loud that it is drowned out. It looks like the contacts are not even, that is to say that they look like each side is not in sync with each other. Could this be the cause of the drifting voltages and noise?
Thanks for the help.
Jon.
:
:
:
:
::Continuing to work on this radio and have replaced the capacitors that are integral in the vibrator(.5 mfd). It produces lots of "hash" and noticed that the contacts arc a little.The contacts look like they are pitted and it looks like someone in the past has bent the contact arms to do some sort of adjustment Is this normal or is this what is causing the hash? Should I increase the value of the caps? All other caps have been replaced. The vibrator is a Mallory type 275 5 pin. Are 5 pin replacements available as I have only seen 4 pins in the catalogs.
::Many thanks,
::Jon.
::Thanks,
::Jon.
Did you ever come back with the info relevant to the
amount of B+ voltage that you have being created and being fed to the plates of the AF output and earlier AF tube stages? As well as the audio stages actually amplifying signal. They could be stone dead and inhibiting any signal passage and your still getting
that hash noise merely from the primary of the AF output transformer.
73's de Edd
:Continuing to work on this radio and have replaced the capacitors that are integral in the vibrator(.5 mfd). It produces lots of "hash" and noticed that the contacts arc a little.The contacts look like they are pitted and it looks like someone in the past has bent the contact arms to do some sort of adjustment Is this normal or is this what is causing the hash? Should I increase the value of the caps? All other caps have been replaced. The vibrator is a Mallory type 275 5 pin. Are 5 pin replacements available as I have only seen 4 pins in the catalogs.
:Many thanks,
:Jon.
:Thanks,
:Jon.