I recently acquired a Scott 233......in pretty nice condition, and seems to be functioning well after some basic maintenance. However, I've yet to confirm that the bias and balance are set properly, and I can't find any literature or posted material to confirm or refute my ideas on proper set-up. The amp uses 7591s in PP.....and according to the Scott home page, 'the pair' should display about 65Ma in bias. There is a test point on the amp chassis....and I've hooked up my DMM to that point....and in current mode, I read about 30Ma now, with a range from about 2 to 35 on the pot. This being true, I can't possibly get the pot near 65Ma for the pair.....which makes me wonder; just what should this reading be, and am I taking it properly? I'm simply putting my negative probe to chassis ground, and the positive probe to the test point, and with the scale set to current and where the pots are now set, I'm getting about 30 Ma on both channels. I'd also note that the old pink paint that Scott used to mark or 'seal' these adjustment pots seems to line up in the position I now have them in. Also, there is a 'balance' pot that I'm concerned with as well. How do I set this adjustment? I can turn the amp over, and take a pin reading....but I don't know what I'm looking for. So, any help would REALLY be appreciated!! Many Thanks, Tom D. Wharf_Creek at Hotmail dot Com
.
.