I'm pickin' up radio stations on amp!

[overbybr]

Since various beneficial suggestions have been given...

Have you tried this?

[dbase]

Have you tried to play along? ... sounds like it would make a great practice amp along with the radio.

[WCHIII]

LOL... I havent heard of that since 1974 to be exact. We were playing a gig and in the middle of a song, a local AM radio station started coming in over the PA just as loud as we were playing. We looked at each other and eventually quit playing and The Doobie Brothers continued with Long Train Runnin... Never heard of that happening since then. Thanks for the flash back...LOL

[Root 5]

Originally Posted by 1958Bassman

How old is the house? Does it have two prong, or three prong outlets

The house was built circa 1855 - 1860.

It has three prong outlets.

[Cody Stanley]

Reminds me of Spinal Tap

[BogeyBass]

you must be close to a radio station transmitter.

sometimes its a actual commercial station, maybe a church or even a home Realtor.

sounds like the amp does not have much for radio interference protection. simple circuit really , one resistor and one cap.

you could try and install one in your bass instead of the input jack on your amp. pretty much the same the randall aikens link given has to say. or if your handy you could wire it on the jack itself. sometimes your lucky and can skip the resistor and just wire a .001uf / 1n cap across the input jack.

otherwise a 5k and .001uf cap should be fine, allows everything under 30,000 hz to pass and will kill all higher frequency radio interference.

[mlowe]

Your instrument lead may be resonant with the station, changing its length may help. Easiest to try another cable back to back. Its a common issue with other kinds of gear too.

[tmdazed]

the house wiring either has an earth ground fault or phasing fault, my folks old garage was like that . Plug my amp in my room , all was at peace, move out to the garage and i was picking up the top 20 country hits from CKRM, wasnt just me , the other guitar player it was happening to as well.

[superdick2112]

Back in the '80s there was a rock club just outside of Denver on Lookout Mountain called Sam's, and it was located just 1/4 mile away from a radio station. Anybody playing there & using a tube amp would have to wrap foil around their amp to minimize radio interference.
Nothing says "dive bar" quite like Marshall & SVT heads wrapped up in foil & looking like giant baked potatoes....

[Codger]

Originally Posted by mlowe

Your instrument lead may be resonant with the station, changing its length may help. Easiest to try another cable back to back. Its a common issue with other kinds of gear too.

OP says it happens "sans cable". This is likely through AC power line.

From the Aikens article:

• Install an internal AC power filter, such as those made by Corcom (available from Digi-key). You must use a filter appropriately sized for the mains voltage and current draw of the amplifier.
• Install a clamp-on ferrite core on the AC cord right at the point where it is plugged into the amp.

I wonder if powering through a good RFI filtered power strip would be a way to test this, if such a thing existed.