Harman/Kardon HK3370 Tuner Hum

[Robert Nogo]

The tuner will hum real loud when the the unit is cold but it won't be as
loud as the receiver or the room heats up. The hum sounds like power line
hum and it's the same rather it's on AM or FM.

What happened? What could cause such a thing? It just started doing it all
of the sudden but it is just the tuner, all the other inputs (CD, AUX, Tape
Monitor) do not have the problem.

 

[Mark D. Zacharias]

Possibly a bad power supply capacitor.


Mark Z.


--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"Robert Nogo" <robertnogo@cox.net> wrote in message
news:ZtLIb.35831$gN.33637@fed1read05...

The tuner will hum real loud when the the unit is cold but it won't be as
loud as the receiver or the room heats up. The hum sounds like power line
hum and it's the same rather it's on AM or FM.

What happened? What could cause such a thing? It just started doing it all
of the sudden but it is just the tuner, all the other inputs (CD, AUX,
Tape
Monitor) do not have the problem.

 

[Dave M.]

There could be a bad electrolytic in the AM FM IF section. I've seen cap
problems in the pre-amp sections of Harmon Kardon in the past.


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message
news:bt085a$1v3ea$1@ID-180484.news.uni-berlin.de...

Possibly a bad power supply capacitor.

Mark Z.


--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"Robert Nogo" <robertnogo@cox.net> wrote in message
news:ZtLIb.35831$gN.33637@fed1read05...
The tuner will hum real loud when the the unit is cold but it won't be
as
loud as the receiver or the room heats up. The hum sounds like power
line
hum and it's the same rather it's on AM or FM.

What happened? What could cause such a thing? It just started doing it
all
of the sudden but it is just the tuner, all the other inputs (CD, AUX,
Tape
Monitor) do not have the problem.

 

[Jerry G.]

Defective filter caps or bypass caps in the power supply, or along the
distribution in the unit.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Robert Nogo" <robertnogo@cox.net> wrote in message
news:ZtLIb.35831$gN.33637@fed1read05...
The tuner will hum real loud when the the unit is cold but it won't be as
loud as the receiver or the room heats up. The hum sounds like power line
hum and it's the same rather it's on AM or FM.

What happened? What could cause such a thing? It just started doing it all
of the sudden but it is just the tuner, all the other inputs (CD, AUX, Tape
Monitor) do not have the problem.