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In Reply to: RE: Scott bias pot, what is going on here? posted by gkargreen on February 01, 2015 at 19:03:55
Randy
Believe it or not,those out of tolerance will work with no issues for the simple reason that the bias network draws very little current and you can adjust them down to where they need to be..When I said look at the pot,I meant read the actual numbers printed on the pot and you can probably see if they are close to the measured values.
Your pot that measures 58k is fine..Most of those pots were 20% tolerance anyway.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Follow Ups:
and it measured 75K, but printed on the pot is clearly "100K" (its also an older looking pot, FWIW). So it appears that there are two widely different value of pots in the DC balance circuit, shouldn't they be the same values, or does that not matter? Any suggestions on what value of pot I should use for the second pot? 50K or 100K, or just leave the out-of-value one in there?I am planning on using the Scott method of balancing the bias in the amp via the 1st gen instruction in the Sams, even though it is a second gen version of the 299, do you thin that will be OK? thanks!
Randy
Those pot values are not that critical simply because of the minimal current draw in the circuit.The 100k pot you are simply using as a balance pot to even the cathode voltage between each pair of output tubes..I would use what the schematic calls for if you have them but it's not a big deal. If you can set the bias voltage and balance,you are good to go..
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Edits: 02/01/15
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