I did a very neat and tidy re-build of my S.E.X. amp, as all the experiments I had going rendered it like a bird's nest. I also have turned back the clock to the stock amp with MQ iron upgrade - no C4S, cathode feedback, 6EM7 tubes, etc. for now. I did forget to order one particular part from Mouser, however, and this leaves me wondering.
I currently have substituted a 1k resistor for each 1270 ohm bias set resistor on the Va halves of the 6DN7s. I don't have anything closer at the moment, nor can I get any closer by paralleling resistors, either. I do have a handful of HLMP-6000 LED's, however. I'm just wondering, would it be OK to set the bias with the LED's and if I were to substitute those for the 1.27k resistors, would I have to do anything else anywhere along the line? The reason why I ask is that I'm not sure of how much voltage the resistor is dropping, so I can't compare it with the LED. If they were the same, I obviously wouldn't have to do anything, right? The 1k resistors in there now seem to make the amp louder than it should be and more prone to distortion when the volume is turned all of the way up. I can order the 1.27k parts, but want to use this as an opportunity to play around with LED bias while I'm at it. Supposedly, LED bias is cleaner sounding in the bass than resistors?
RadioShack has 1.5k resistors (just as "off as 1k, so no good) or 1.2k 1/4W, but you have to buy $13 worth (pack of 500) to get them. So if I can get away with the LED's I already have on hand, that would be great.