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FDP Forum / Fender Amps: Vintage (before 1985) / Hum in the '64 White Knob Princeton...

super mario
Contributing Member
*********

USA

tone to the bone no other way
Dec 5th, 2016 09:56 AM   Edit   Profile   Print Topic   Search Topic

Been using my regular amp in the Sunday services of late when playing electric guitar. No issues till this week when I plugged it in at home to work on some stuff and had a "steady hum" in the background. Nothing has changed at home wiring wise and I have played this amp for years with it being quiet. Now there is the hum....it is there even when the amp volume is set to 0, all other controls at 0 as well (this amp has a total of four controls: tone, speed, intensity and of course volume). For the tube amp gurus on these older circuits = thoughts on where to start the search. This amp still has the two-wire power cord setup but I am planning on making that update soon with a new three-prong plug setup. Just wanting to get thoughts on where to look first in regards to this "steady hum".

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 6th, 2016 07:12 PM   Edit   Profile   Print Topic   Search Topic

I have more questions than answers for you but would suggest that if the amp does this plugged in at church or at home it is time for a filter cap can change. This hum is a warning that the cap can may fail causing other possible damage to the amplifier.

If this has never been done it is long over due.

super mario
Contributing Member
*********

USA

tone to the bone no other way
Dec 6th, 2016 08:57 PM   Edit   Profile   Print Topic   Search Topic

Hammond - I know it was "serviced" sometime in the late '70's but don't know if the cap can was changed. This was when my to-be Father in Law played it. He passed away in the mid-90's, long before I married into the family. Going to put it on the bench and begin checking it out....

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 7th, 2016 06:45 PM   Edit   Profile   Print Topic   Search Topic

If you have an ESR meter its an easy check. Even if the filter can was changed in the '70s it would again be time, overdue actually figuring a 20 year life. If you plan to play it swap it out. Mis-matched power tubes can also cause hum.

FDP Forum / Fender Amps: Vintage (before 1985) / Hum in the '64 White Knob Princeton...




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