Dynacos get a new home
Comments
-
That's good to know Face....Will stick to AVt1s for now...I'll be e-mailing Joe. Later when further on the path....
Ok in way over my head...I have not touched anything on my dynaco...I don't know how to adjust bias. Is there a tutorial somewhere? -
Ok in way over my head...I have not touched anything on my dynaco...I don't know how to adjust bias. Is there a tutorial somewhere?
www.dynaco-doctor.com has an ST-70 instruction book in pdf format you can download.
All you need is a multimeter and screw driver. Set it to the 1-10V (or 1-20 or whatever your meter has) range. You want to measure Voltage.
Take the black lead, and let it touch the chassis. I use an alligator clip which makes it easier. Stick the red lead into the front socket where it says "bias 1.56V". You should get a reading on your meter. You will have to adjust the knobs located between the PS cap and rectifier tube with your screw driver. Clockwise to increase, c.cw, to decrease. One is for the left side, the other for the right. You want your meter to read 1.56V or slightly lower. I good setting would be around 1.45V Remember that your bias will fluctuate depending on your wall voltage. Do not play music while biasing and let the amp heat up before biasing. Check again after about every few hours to see how consistant your wall voltage is.
When I insert a fresh set of tubes, I like to set bias at minimum, let the amp run for about 30mins and start biasing.
Try not to go over 1.56 or your tube life will be shortened. Too much and the amp may get damaged. Make sure none of the plates in your tubes glow red. -
How do the mullard xf1s sound in comparison to the xf2s?
