[sonata149]

I'm using a different power transformer which gives me about 340V smoothed HT.  When I switch on the preamp the LED immediately goes from red to green. I'm not sure the result of solid state rectification, or because I need to adjust voltage divider values connected to B+ (R107-R108).  If this is the case can someone please advise which resistor to scale down (or up?) and what value to try?

Thanks for a great sounding design.

[hagtech]

If you are using SS rectifiers, then there will be virtually no delay before LED turns green, indicating high voltage is present.

jh

[Free Radical]

My Cornet II changes to green in less than 3 seconds.  All components are as per build sheets.  I've tried different 5Y3GT's and a 5Y3G, all with the same results.
It was easy to build and sounds wonderful by the way, I'm just a little concerned that I might be abusing the cathodes.

Regards

[samplesj]

Aren't most 5Y3 fast start?  Its just happens that the Sovtek 5Y3 is a slow starter.  Depending on what you've tried they may all be the fast type.

Maybe try a 5AR4/GZ34?  They are all slow start.  Its a drop in replacement (no other changes needed).  It'll give you a bit higher B+ voltage too.