Scott LK-48-B Bias Voltage Help

[njcanuck]

How did you hold the cap together after stuffing it?

I use a little 5 minute epoxy (around the inside rim and under the ground ring) and some small clamps to seal them up. Once back in the chassis, it's hard to tell that they were ever touched.

 

[NOSValves]

if there was high ripple on the bias voltage,would it show as higher voltage?

Not DC voltage.

 

[s-petersen]

I use a little 5 minute epoxy (around the inside rim and under the ground ring) and some small clamps to seal them up. Once back in the chassis, it's hard to tell that they were ever touched.

I like that repair,it looks great

 

[s-petersen]

Not DC voltage.

I wasn't sure if the peak dc would be higher than the filtered dc,and read higher on the meter.

 

[njcanuck]

The ONLY reason that your bias voltage would drop from a change in capacitors is because the new caps are drawing some current of their own to create the drop.

It may be that they still need to form, but in any event, I agree with Craig -- if there is a permanent drop in bias voltage because of a change in caps used in the bias circuit, then those caps are suspect. A properly operating cap of any type construction will draw no discernible current at all, other than its charging current.

Dave

Dave, I think you nailed it. I don't believe the caps had formed. After a few hours of burn in, everything's back to normal. I'm still going to keep eye on them for while. :yes: