Scott 260 amplifier modification.

[OldStuff]

I was wondering if any of might have seen this board on a Scott 260 amplifier before? It seems to be well made especially for the time the amplifier was around. It's not on the service manual and I have yet to find anything on the web that will show the inside of this amplifier.

 

[Ken Boyd]

Follow where those leads go, that might give you an idea on what it might affect.

 

[OldStuff]

Strange... tape and rumble. Honestly, I don't know what they use the rumble switch for, and I have no idea why you would need to modify the tape switch. My main concern is trying to figure out what the capacitance is of the three capacitors on the board. I'll probably ask if anyone knows anything about them in "General Audio Discussion". Being it is not listed on the capacitor and I have no schematic, and forget about reading them and going by that because most of these caps. give no reading or they are way out of range. This cap. says "A-602A CAP-A" and under that it says NC75.

 

[OldStuff]

I see a 602A green capacitor on Ebay, but it doesn't say what the capacitance is.

 

[OldStuff]

I found a guy on Ebay who says these are made by Western Electric tantalum capacitors rated at 40uf 35v. I tested mine and they are reading between 42uf-44uf, so I'm going to keep mine.

 

[RVT1K]

Strange... tape and rumble. Honestly, I don't know what they use the rumble switch for, and I have no idea why you would need to modify the tape switch.

Wasn't it for filtering out low-frequency noise and feedback when playing vinyl? Like from warped records and bumps. Maybe it goes to the tape switch so you can filter when recording from vinyl?

 

[OldStuff]

Yes, I also thought rumble had something to do with playing vinyl. The board is split in two with both sides identical. Half for the rumble and half for the tape. I imagine back when this amplifier was being used, vinyl and tape was about the only two choices you had.