Your Unidentified Chassis Object is a wave-trap combo, and in current times, not particularly of any reception altering consequence, unless you are in the far Northeast or in the far Northwest areas and MIGHT occasionally receive a couple of offending signals at times. I know that I did in the Seattle area in the past.
It’s hard to immediately evaluate on your squeaky-squeaky effect, as it could be power supply, RF stage, AF stage decoupling or even poor shielding / grounding induced.
Lets make a start with shorting the Rf signal input grid of the 6A8 to ground via the grid cap atop it.
and then you run up the volume to see if the spurious squealing has now stopped at all positions of the volume control.
If not complete, then move down one stage to the 6K7 I.F. amplifier stage and do the same to it.
If you are still getting a squeal, that roughly suggests the problem to be on down line from the RF circuitry.
Your short "marker wires" should be causing no problems.
Standing by for results….
73's de Edd
Was this set squealing before the recap?
Doug
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:Your Unidentified Chassis Object is a wave-trap combo, and in current times, not particularly of any reception altering consequence, unless you are in the far Northeast or in the far Northwest areas and MIGHT occasionally receive a couple of offending signals at times. I know that I did in the Seattle area in the past.
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:It’s hard to immediately evaluate on your squeaky-squeaky effect, as it could be power supply, RF stage, AF stage decoupling or even poor shielding / grounding induced.
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:Lets make a start with shorting the Rf signal input grid of the 6A8 to ground via the grid cap atop it.
:and then you run up the volume to see if the spurious squealing has now stopped at all positions of the volume control.
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:If not complete, then move down one stage to the 6K7 I.F. amplifier stage and do the same to it.
:If you are still getting a squeal, that roughly suggests the problem to be on down line from the RF circuitry.
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:Your short "marker wires" should be causing no problems.
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:Standing by for results….
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:73's de Edd
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:Was this set squealing before the recap?
:Doug
:Well yes it was very similiar before I recapped it. Turning up the volume would make it produce a loud audio signal distorted. Now the sould is not as distorted but still very annoying
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::Your Unidentified Chassis Object is a wave-trap combo, and in current times, not particularly of any reception altering consequence, unless you are in the far Northeast or in the far Northwest areas and MIGHT occasionally receive a couple of offending signals at times. I know that I did in the Seattle area in the past.
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::It’s hard to immediately evaluate on your squeaky-squeaky effect, as it could be power supply, RF stage, AF stage decoupling or even poor shielding / grounding induced.
::
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::Lets make a start with shorting the Rf signal input grid of the 6A8 to ground via the grid cap atop it.
::and then you run up the volume to see if the spurious squealing has now stopped at all positions of the volume control.
::
::
::If not complete, then move down one stage to the 6K7 I.F. amplifier stage and do the same to it.
::If you are still getting a squeal, that roughly suggests the problem to be on down line from the RF circuitry.
::
::Your short "marker wires" should be causing no problems.
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::
::Standing by for results….
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::73's de Edd
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:Your Unidentified Chassis Object is a wave-trap combo, and in current times, not particularly of any reception altering consequence, unless you are in the far Northeast or in the far Northwest areas and MIGHT occasionally receive a couple of offending signals at times. I know that I did in the Seattle area in the past.
:
:
:It’s hard to immediately evaluate on your squeaky-squeaky effect, as it could be power supply, RF stage, AF stage decoupling or even poor shielding / grounding induced.
:
:
:Lets make a start with shorting the Rf signal input grid of the 6A8 to ground via the grid cap atop it.
:and then you run up the volume to see if the spurious squealing has now stopped at all positions of the volume control.
:
:
:If not complete, then move down one stage to the 6K7 I.F. amplifier stage and do the same to it.
:If you are still getting a squeal, that roughly suggests the problem to be on down line from the RF circuitry.
:
:Your short "marker wires" should be causing no problems.
:
:
:
:
:Standing by for results….
:
:
:
:73's de Edd
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Steve
:Steve
:No I dont have the alignment procedures, that would be great.
Steve
The test seems to indicate your problem t be RF / IF related and not power supply or final audio induced antics.
I just read right over the “whole capacitor dangling “scenario…was only thinking of clipped “marker” wire leads.
That extra baggage of stray capacitance and coupling could be a problem in the IF and RF stages.
Try getting the
radio doin’ its ‘thang with the volume left up and then fondly stroke and caress the capacitors on the afore mentioned
areas to see if there is ANY transition in the squeal coming from the radio. That added stray hand capacitance, as well as the components positioning should then answer your query as per the criticality of those floating components.
Lastly, since you were going to be doing an alignment anyhow, and if not done yet, how’s about marking the screw slot positions of the of the 4 I.F. transformer adjustments and make a ¼ turn cw, then a ½ turn ccw and then a ¼ turn back to get you back to the very same initial starting point and see if your squeal abated, transitioned or disappeared completely. Then try the other half of the transformer the same way.
And then do the same to the remaining transformer. I am suspecting one to have had a major affect on your problem.
You are then left to do a full IF alignment…but this might have pointed you to the criticality of one particular adjustment area.
73's de Edd
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:The test seems to indicate your problem t be RF / IF related and not power supply or final audio induced antics.
:
:I just read right over the “whole capacitor dangling “scenario…was only thinking of clipped “marker” wire leads.
:That extra baggage of stray capacitance and coupling could be a problem in the IF and RF stages.
:Try getting the
:radio doin’ its ‘thang with the volume left up and then fondly stroke and caress the capacitors on the afore mentioned
:areas to see if there is ANY transition in the squeal coming from the radio. That added stray hand capacitance, as well as the components positioning should then answer your query as per the criticality of those floating components.
:
:Lastly, since you were going to be doing an alignment anyhow, and if not done yet, how’s about marking the screw slot positions of the of the 4 I.F. transformer adjustments and make a ¼ turn cw, then a ½ turn ccw and then a ¼ turn back to get you back to the very same initial starting point and see if your squeal abated, transitioned or disappeared completely. Then try the other half of the transformer the same way.
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:And then do the same to the remaining transformer. I am suspecting one to have had a major affect on your problem.
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:You are then left to do a full IF alignment…but this might have pointed you to the criticality of one particular adjustment area.
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:73's de Edd
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::Hello, I took out all the old caps to restore later. I then played with every adjustment known to man on this radio and no more squeal. I peaked all the adjustments and then tried it...no more squeal.
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::The test seems to indicate your problem t be RF / IF related and not power supply or final audio induced antics.
::
::I just read right over the “whole capacitor dangling “scenario…was only thinking of clipped “marker” wire leads.
::That extra baggage of stray capacitance and coupling could be a problem in the IF and RF stages.
::Try getting the
::radio doin’ its ‘thang with the volume left up and then fondly stroke and caress the capacitors on the afore mentioned
::areas to see if there is ANY transition in the squeal coming from the radio. That added stray hand capacitance, as well as the components positioning should then answer your query as per the criticality of those floating components.
::
::Lastly, since you were going to be doing an alignment anyhow, and if not done yet, how’s about marking the screw slot positions of the of the 4 I.F. transformer adjustments and make a ¼ turn cw, then a ½ turn ccw and then a ¼ turn back to get you back to the very same initial starting point and see if your squeal abated, transitioned or disappeared completely. Then try the other half of the transformer the same way.
::
::And then do the same to the remaining transformer. I am suspecting one to have had a major affect on your problem.
::
::
::You are then left to do a full IF alignment…but this might have pointed you to the criticality of one particular adjustment area.
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::73's de Edd
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