Readers:

I have a good bit of low frequency hum in all of my phono and tape outputs
on an early 60's McIntosh C-20 preamp. The ground from the phono is
connected and, interestingly enough, I even have the hum on all outputs even
if there is nothing connected to that input.

Is this to be expected? Is it common, unavoidable, a tube problem? If
anyone has an answer, or even a decent guess, I would certainly appreciate a
lead.

Thanks in advance, MSK

"Michael S. Kakuk" <(E-Mail Removed)> wrote in news:T5WdnZ9QOPEs-nXcRVn-
(E-Mail Removed):

> Readers:
>
> I have a good bit of low frequency hum in all of my phono and tape
outputs
> on an early 60's McIntosh C-20 preamp. The ground from the phono is
> connected and, interestingly enough, I even have the hum on all outputs
even
> if there is nothing connected to that input.
>
> Is this to be expected? Is it common, unavoidable, a tube problem? If
> anyone has an answer, or even a decent guess, I would certainly
appreciate a
> lead.
>
> Thanks in advance, MSK
>
>
>
>
>

The power supply electrolytics are open and must be replaced. There
should be no hum at all.

r


--
Nothing beats the bandwidth of a station wagon filled with DLT tapes.

On Sat, 15 Jan 2005 13:58:56 GMT, R <(E-Mail Removed)> wrote:

>"Michael S. Kakuk" <(E-Mail Removed)> wrote in news:T5WdnZ9QOPEs-nXcRVn-
>(E-Mail Removed):
>
>> Readers:
>>
>> I have a good bit of low frequency hum in all of my phono and tape
>outputs
>> on an early 60's McIntosh C-20 preamp. The ground from the phono is
>> connected and, interestingly enough, I even have the hum on all outputs
>even
>> if there is nothing connected to that input.
>>
>> Is this to be expected? Is it common, unavoidable, a tube problem? If
>> anyone has an answer, or even a decent guess, I would certainly
>appreciate a
>> lead.
>>
>> Thanks in advance, MSK
>>
>>
>>
>>
>>
>
>The power supply electrolytics are open and must be replaced. There
>should be no hum at all.
>
>r
Or bad A/C - get an electrician