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Marantz 3300 Service Bulletin M-3300-1 question

Beamer302

Beamer302

Active Member
I am working on a nice Marantz 3300 . I have it all done . I just came across an original service bulletin M-3300-1 .for serial number 2540 and up . Mine is 2839 so this applies to my unit. The service Bulletin reads ,
"Two design changes have been made to the Model 3300 serial numbers 2540 and up, on the Tone Amplifier circuit. One is the deletion of resistors R307 and R 322 valued 1 megohm. The other is the changing of the capacitors C305 and C315 valued 82pF. 10%, 100v (Part No385-1065-000) to 27pF. 10% 100v (Part No 385-1036-000 . Incorporate these changes into the service manual as soon as possible, to ensure proper reference information ."
My question is this . Should I mess with these easy changes .
Has anyone done or even heard of this ?
Must be a tone enhancement for the better I'm guessing.
 
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Since your 3300's serial number is after the bulletins starting number - it would seem that your unit already has these changes incorporated into it - Chris
 
Mine does not have the two resistors on the circuit board . and the value of the capacitors are 27pF . This shows the change has been applied. My understanding on the sequence of serial numbers is from 2540 and up this design change has been applied. I looked at the schematic and it (service bulletin) is a change in the treble and bass circuit.
 
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Beamer302 said:
Mine does have the two resistors on the circuit board . and the value of the capacitors are 82pF . The fact that the resistors are there shows that this circuit change has not been applied .If it was applied they would not be there. My understanding on the sequence of serial numbers is from 2540 and up to and including 2839 which is my serial number on this 3300. I looked at the schematic and it (service bulletin) is a change in the treble and bass circuit.
Click to expand...

So, that's a good call then.
Make me wonder about my 3300 - but it's serial is 4600 so I'm probably good on the update.
I have pictures of all the boards..., I could probably find the right picture.

EDIT:
Pictures here of my unit, when I recapped it. I'm still using it, no issues at all with mine.
https://audiokarma.org/forums/index.php?threads/marantz-3300-repair.615604/
 
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