LA3a tech help needed

[Bradw764]

I have an LA-#A Urei that doesn't have a bias pot. T4B was bad. Replaced several 10uf caps and now my bias voltage is at 23 volts. Before changing caps it was at 13.5. Also when I turned the limit pot all the way up, the meter would peg and I would get a bunch of hum. The unit is passing signal but no compression. Is this a different version? must be. Thanks for any infp. Brad

 

[soundguruman]

Change ALL the electrolytic capacitors.
Use high quality ones to replace the old ones. Capacitors go bad with age.
If the caps are more than 10 years old, you are looking at the problem.

 

[Bradw764]

Change ALL the electrolytic capacitors.
Use high quality ones to replace the old ones. Capacitors go bad with age.
If the caps are more than 10 years old, you are looking at the problem.

Thanks for the advice. Any reasom bias voltage jumped up? Why would the old T4B seem to react when the new Drip model doesn't? Shouldn't I be seeing A/C voltages? Have you seen one like this with no bias pot? I will get ALL caps done. Thanks again!

 

[Bradw764]

C3 is labeled wrong on the board (+) is actually (-) swapped cap around and problem resolved.