Bias Pot Question

[morton]

Is there any problem with using a regular linear taper pot (example 50kl) for bias adjustment? Asking because my next project is a 5F10 and I would like to be able toadjust the bias externally and mount the pot on the back of the chassis.

Thanks,
Gary

[eleventeen]

Linear is exactly what you want.

[sluckey]

If you put a twisty thing on the outside of a guitar amp chassis, someone will twist it. Could be expensive.

[morton]

It would just be me, actually I'm going to use your layout from the Harvard you redid. Thanks by the way, the schemo and layout helped greatlly. Weber had a locking 50kl, but it looks like they've been out of stock for q while. They have a locking 25kl, but that would reduce the range. Might just end up using the 50kl that Doug offers. Once I get the board layout started I'll need some pointers on the bias pot connections.

Thanks,
Gary

[sluckey]

I like the RV6 style locking pots and have used them in several of my builds...

http://www.ebay.com/itm/50K-OHM-MINIATURE-POTENTIOMETER-CTS-RV6-SIZE-LOCKING-NOS-1-PCS/331940074134?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D38804%26meid%3D142e5d09c5b042cc8cbcde7ccf148f5f%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D232049549153

[morton]

Thanks, those are just what I was looking for. Just ordered 3. Is the install the same as when you're using the mini 50kl trimmer pot that Doug sells?

Thanks,
Gary

[sluckey]

Wiring is the same. You may have to use your ohm meter to figure out which terminal is the wiper.

[morton]

Thanks, just to make sure I get my turrets placed right, on Doug's bias link with the trimmer, right leg not used, left leg to the 24k and ground on your layout, wiper to the negative of the 100uf/diode then to the 220k resistors. Or do I use the standard Fender circuit with left leg to 24k/ground, center wiper to the junction of the 220k resistors, right leg to the 100uf diode?

Thanks,
Gary

[sluckey]

I would do it like this. Install one more turret...

[morton]

Thanks, appreciate it. I should get started on it next week. Post some pics when it's complete.