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11-16-2018, 07:39 PM
Hi Guys
Yes, the 100Rs are to protect against oscillation given that otherwise there are no screen-stops. Once you install individual screen-stops, there is much less risk of oscillation.
You can use the 100R positions for two of the new Rs, but you'll have to slash the trace that goes to the other tube so that both screen-stops on a given circuit side can terminate at Vs. Alternatively, you can leave the 100s in place and do the other slash required to give the inboard tube a screen-stop and effectively have both tubes sharing the screen-stop.
Traynor did what PV did in his version of a Twin Reverb. That amp has a quad of EL-34s with a shared screen-stop overall and 100R to the outboard tubes from the inner ones. This is a hifi approach, since Pete was into using hifi techniques. PV was just saving $$
Yes, the 100Rs are to protect against oscillation given that otherwise there are no screen-stops. Once you install individual screen-stops, there is much less risk of oscillation.
You can use the 100R positions for two of the new Rs, but you'll have to slash the trace that goes to the other tube so that both screen-stops on a given circuit side can terminate at Vs. Alternatively, you can leave the 100s in place and do the other slash required to give the inboard tube a screen-stop and effectively have both tubes sharing the screen-stop.
Traynor did what PV did in his version of a Twin Reverb. That amp has a quad of EL-34s with a shared screen-stop overall and 100R to the outboard tubes from the inner ones. This is a hifi approach, since Pete was into using hifi techniques. PV was just saving $$
