I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?

:I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?

Replace all the filter caps - if bridging then one by one didn't help, then one or more are bad/shorting/leaking.

::I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?
:
:Replace all the filter caps - if bridging then one by one didn't help, then one or more are bad/shorting/leaking.

I guess I'll show my ignorance. What is "Bridging?"

Thanks,
Bill

:::I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?
::
::Replace all the filter caps - if bridging then one by one didn't help, then one or more are bad/shorting/leaking.
:
:I guess I'll show my ignorance. What is "Bridging?"
:
:Thanks,
:Bill

::::I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?
:::
:::Replace all the filter caps - if bridging then one by one didn't help, then one or more are bad/shorting/leaking.
::
::I guess I'll show my ignorance. What is "Bridging?"
::
::Thanks,
::Bill
In reply to Bill.
Bridging is another way for saying placing components in parallel. Sometimes saying placing components "across" is used. I used a good filter capacitor and with two leads connected that good filter capacitor to the filter capacitor in the radio without disconnecting the filter capacitor in the radio. If the filter capacitor in the radio was completely open the good filter capacitor would have fixed the radio. It would be the equivalent of no radio filter capacitor. Then I would have replaced the radio filter capacitor. But if the radio filter capacitor had leakage or shorted then bridging wouldn't tell me anything or be missleading. That's why someone suggested I disconnect all together and replace the radio filter capacitor as a true test. I hope that helps Bill.

:::::I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?
::::
::::Replace all the filter caps - if bridging then one by one didn't help, then one or more are bad/shorting/leaking.
:::
:::I guess I'll show my ignorance. What is "Bridging?"
:::
:::Thanks,
:::Bill
:In reply to Bill.
:Bridging is another way for saying placing components in parallel. Sometimes saying placing components "across" is used. I used a good filter capacitor and with two leads connected that good filter capacitor to the filter capacitor in the radio without disconnecting the filter capacitor in the radio. If the filter capacitor in the radio was completely open the good filter capacitor would have fixed the radio. It would be the equivalent of no radio filter capacitor. Then I would have replaced the radio filter capacitor. But if the radio filter capacitor had leakage or shorted then bridging wouldn't tell me anything or be missleading. That's why someone suggested I disconnect all together and replace the radio filter capacitor as a true test. I hope that helps Bill.

Yep, thanks for explaining the term and practice.

Bill

Philip, Replacing caps is way to go and good advice.
Then you can forget about them.I would add that if a shorted cap is suspected that other componets in that area could be affected.They may not be ,but high current from a short could degrade other componets.What I would do (after caps are done)as an easy check is look for voltages on riders schematic and get your vtvm out.Make sure you are ballpark through the reciever to these voltages.In the course of only fixing a few radios this has found a bad carbon resistor and an open wirewound for me.Even if nothing is wrong ,it's a good reference for later troubleshooting.Good luck!

Bill T
:I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?

Hi

If the hum can't be reduced by lowering volume the problem is either power supply or audio stages in a radio.

Be sure negative side of electrolytic caps are connected to B- in your radio not chassis. The chassis will be isolated from B- through a resistor/cap combination.

Replacing electrolytic caps usually fixes hum problems. An internal short within a tube or radio wiring can cause hum. This is not common.

Information on your radio can be found here:

http://www.nostalgiaair.org/PagesByModel/725/M0013725.pdf

Norm

:Philip, Replacing caps is way to go and good advice.
:Then you can forget about them.I would add that if a shorted cap is suspected that other componets in that area could be affected.They may not be ,but high current from a short could degrade other componets.What I would do (after caps are done)as an easy check is look for voltages on riders schematic and get your vtvm out.Make sure you are ballpark through the reciever to these voltages.In the course of only fixing a few radios this has found a bad carbon resistor and an open wirewound for me.Even if nothing is wrong ,it's a good reference for later troubleshooting.Good luck!
:
:Bill T
::I have a Philco radio model 51-537 with tubes 35Y4, 50L6, 7A8, 14A7 & 14B6. I get a very loud buzz that can't be lowered with the volume control. I bridged all the E-caps, 20, 30, 30 at 150V with no help. With one antenna wire connected I do hear very faintly one station, garbled. What coild be the problem?