He also was pretty adamant about NOT putting a resistor in series with the new bias diode, saying the higher (more negative) Vbias is important (with today's higher line voltages). I don't quite follow that, honestly, as it seems to me that Vbias would track with B+ as line voltage increases. But I decided to just trust McShane, he's been doing this a lot longer than me.
It's all Latin to me. As in, I understand the prefixes and suffixes enough to sort out a lot of the meaning, but don't speak the language.
Terry recommends setting the resistor to get -46 on the bias when the B+ is 435vdc because that was the original intent. I went with his recommendation. On the other hand, Jim has been doing this for a long time and is the Terry of Citation II as far as my reading goes. I don't know if a McShane Citation II pulls the same resale bump as a DeWick Mac does but his reputation seems to follow Terry's and reading his site does give me confidence.
That all said, I'm sticking with Terry on the selenium rectifier replacement and using the diode+ resistor. I'm also keeping the Black Beauty Caps as Terry claims that you aren't going to find a better cap for the Mc240 and it is a metal foil cap.
The other place that Jim seems to veer off is the 10K-10% resistors (R10&R33) on the input side of the circuit. He has these swapped out to 1K-5%. I'm not really sure what the purpose of that would be other than to maybe increase the input volume? Does anyone have any thoughts on this? At this time I've pulled and tested the 10Ks, one measured at 9.99 and the other at 10.05. Both well within spec so I left them in circuit.
To be honest, of all the resistors I've pulled, only 1, 56K-10%, tested out of spec at 61K although there have been a few that were right on the edge of their limit.
My intent at this point is to swap the rest of the resistors with the ones that Jim supplied. Mostly because re-using the ones I pulled would be difficult at best.
