(not sure if that would be better suited in the Fender section so feel free to move it)
I'm pretty ashamed I couldn't fix it myself but the point is I got no sound at all before 9 o'clock and then the volume starts to grow rather not progressively enough.
I started investigating around the taper of the (alpha) pots and measured that at noon the resistance between taper and "ground" is on average (over 3-4 pots) 10% of the overall one.
I recall the topic being raised occasionally. Try including j taper in the search criteria.
Weber used to sell the required values with a faster taper, eg 25 or 30%.
Alternatively, try a linear pot, perhaps load it down a bit to slow the taper.
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him!
Volume and treble controls in AB763 Blackface amps were 2-35 "J" taper. CTS are available in US: https://www.tubesandmore.com/products/p ... anel-mount Typical log or audio taper pots are at 10% of the total resistance at 50% rotation, with typically some small (5% rotation) flat at either end. A two-slope "curve" is typical for non-linear pots. If you have no sound until 9:00 (20% rotation), I would say the pot is damaged.
Martin, is that what you used for your DR build? If so, do they have the elongated CCW end pad as per below?
Just to note that for well over 20 years, standard CTS 450 series pots typically have a elongated ‘flat’ CCW end pad, it takes up well over 10% of the available rotation before the wiper reaches the resistive track.
Last edited by pdf64 on Wed Jun 08, 2022 4:58 pm, edited 2 times in total.
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him!
Thanks! I don't think the pot is damaged as I seem to recall that I managed to change it for another one, without success, but maybe ... I'm no more sure about anything related, right now.
