Rockola 474 Explained

[@jim8230]

The part you said was a "valve" is a capacitor. It's the main filter capacitor for the amp's power supply.

[@G7SYY]

This guy seems about as technical as a turnip...

[@pauljames5914]

Also, it shouldn't get hot!

[@edinman5619]

The 474 (and it's close cousin the 50-record 473) were the first Rock-Ola models to have LED displays to show the record playing and the last models to select records from the pinbank system. Later models have an electronic selection system using an optical reader. BTW, I replaced the gas springs on a similarly-built model 478 by using NAPA auto parts Lift Support # BK-819-5208:

[@Tomsonic41]

When did they start hiding the record playing mechanism away like this? I remember using one of these in the 1980s as a kid, and thought it must be using some kind of tape-based playback system, as I couldn't see anything happening!

[@mrmattandmrchay]

Cool machine Marcus! Yeah you'd have thought that removing that mute relay would have cut the COM-NC contact to the speakers or amplifier and it would have gone silent. Amazing selection wheel and coin mech counter system. Certainly reminds me of an old pinball machine that my mate had. That had the same sort of thing inside - when the ball hit certain areas this rotary counter inside the unit would go round until it reached the end and triggered the counter (like a bonus score) many times as it returned back (hmmm wonder if he still has it). Definitely need to take a look at that sometime ;)

[@Averythefanman]

The mute relay is used to mute the amplifier while the mechanism is rejecting a record. The relay will close once the mechanism loads the record to prevent the sound of the brush cleaning the stylus or unwanted noises of the mechanism. Once the record has reached the end and the mechanism rejects, the mute relay will open, muting the speakers.

[@scottb1966]

I have a 474 that is driving me crazy. The write-in arm will flip the switch but the read out arm never reads it. It just circles around back to home.

[@divedeeepr]

I was just given a 1982 Sonata Rock-ola for free.....trying to figure out how to use this thing and make it play records....My speaker overload light is on when I turn on my jukebox.....how do I reset it? Thanks!

[@CROShogun]

can someone help me fixing malfunction on rock-ola 451?please contact me

[@Gameroomofthrones]

Can you tell me what type of fuses (3 fuses on right side) are on the control unit? Type, volts, amps, size Thank you. Mine is missing these fuses. Lance

[@davidhaney1394]

The Rockola 474 doesnt have any valves in it .If you knew your onions , you would know that because it tells you its "solid state".

[@johneason4127]

hi how do i change the record speed ,as my one is playing on slow speed, it is a rockola 449

[@kevinyoung9915]

I have a Rock-ola 450 that when the selector buttons are depressed, there is no selection made. and the reset button does not reset buttons when it is pressed. manual selections can be made and the jukebox works great. Believing something is not powering some where on the selection unit. Any help on what to look at, would be greatly appreciated. Thank you.

[@rpowell3000]

just working on a 444 had similar problem , credits where showing but selector buttons not latching. it was the selector loockbar solenoid that was not energizing turned out to be bad diode ( one of two at the same place ) about an inch from the solenoid . dont know if that helps any

[@Mr_Okeh]

@@rpowell3000 i have a 445 and the write in side of the selector will not select odd numbered records in E and F. ie E1,E3 E5 ,F1 F3 F5 etc Any ideas whst may be causing thi pls. All other selections are fine. Tks

[@jblandi6158]

My 474 has a hum when plugged in. What would cause this. Thanks

[@thehulkster2707]

I'm not a professional nor an expert but in all of the audio equipment I've dealt with in CB and ham radio it's usually a bad capacitor in my experience good luck

[@verily64]

Perhaps the write in contacts aren't aligned exactly right.

[@Countrysidewonderer]

Is ther anyone in Berkshire that can fix rockola princess

[@maximelarose7931]

My light sequencer doesn't work. Any ideas?

[@MikesArcadecom]

I had segments of mine out too. It was a bad led in the segments that were not lit.

[@jtelesky1967]

I have the same exact 474 machine and desperately trying to fix it. Similar issues. I have a feeling I am a few tips away from making this beauty work. Peanut gallery is welcome.here. Sound Off!

[@Me-xh9tb]

Do you know how to set to free play?