I am not sure if this site is for my system but here it goes. I have a big mid 60's RCA Soild state cabinet stereo Model ST-14. I bought it for kicks and it works fine. The problem is that when the power is on there is a very noticable low hum through the speakers, even when nothing has been selected (ie radio , phono etc). Volume has no effect on the hum.
Has anyone any ideas? I am OK with electronics but I need a little help. I would assume it was something to do with the power supply or amp.
Any help would be appreciated
Thanks
Rob
Most likely electrolytic filter caps. These dry out over time and allow hum.
Another thing that can cause hum is open inputs on an amplifier.
Norm
:Hello
:
:I am not sure if this site is for my system but here it goes. I have a big mid 60's RCA Soild state cabinet stereo Model ST-14. I bought it for kicks and it works fine. The problem is that when the power is on there is a very noticable low hum through the speakers, even when nothing has been selected (ie radio , phono etc). Volume has no effect on the hum.
:
:Has anyone any ideas? I am OK with electronics but I need a little help. I would assume it was something to do with the power supply or amp.
:
:Any help would be appreciated
:Thanks
:Rob
They are
#B 124536-10
MesseyUK
CE 1584/14
2500uf 25v DC WKG
Oct 65
Thanks
Rob Guy
Hi Rob
:
: Most likely electrolytic filter caps. These dry out over time and allow hum.
:
: Another thing that can cause hum is open inputs on an amplifier.
:
:Norm
:
::Hello
::
::I am not sure if this site is for my system but here it goes. I have a big mid 60's RCA Soild state cabinet stereo Model ST-14. I bought it for kicks and it works fine. The problem is that when the power is on there is a very noticable low hum through the speakers, even when nothing has been selected (ie radio , phono etc). Volume has no effect on the hum.
::
::Has anyone any ideas? I am OK with electronics but I need a little help. I would assume it was something to do with the power supply or amp.
::
::Any help would be appreciated
::Thanks
::Rob
The 2500uf @ 25 volts would be filter caps. They were made in 1965 and may have dried out causing hum.
Norm
::Hello Norm
:Thanks for the fast reply. There are two electrolytic caps on the transformer/amplifier unit. They are big 2.5" long and 1" in Dia. Could these be the filters? They are the only ones visible there.
:
:They are
:#B 124536-10
:MesseyUK
:CE 1584/14
:2500uf 25v DC WKG
:Oct 65
:
:Thanks
:Rob Guy
:
:
:Hi Rob
::
:: Most likely electrolytic filter caps. These dry out over time and allow hum.
::
:: Another thing that can cause hum is open inputs on an amplifier.
::
::Norm
::
:::Hello
:::
:::I am not sure if this site is for my system but here it goes. I have a big mid 60's RCA Soild state cabinet stereo Model ST-14. I bought it for kicks and it works fine. The problem is that when the power is on there is a very noticable low hum through the speakers, even when nothing has been selected (ie radio , phono etc). Volume has no effect on the hum.
:::
:::Has anyone any ideas? I am OK with electronics but I need a little help. I would assume it was something to do with the power supply or amp.
:::
:::Any help would be appreciated
:::Thanks
:::Rob