[devo]

I just finished my second Cornet2 (this one for my son). The first one (for me) acted exactly as the manual says; however, the second one seems perfect and the only issue is that the LED light goes from red to green very fast; ~4 seconds. It sounds fine and I actually measured the voltages on this second one and they all look good.

They both sound great and we love them.

Not a big deal, but as a near newbie, this one is bugging me.

Thanks -- David

[poty]

I think you should check the C103 capacitor - it may have less capacitance.
Too low R107 (or too big or break connections of R108) may also cause the behaviour.

[devo]

Thanks -- ordered a replacement capacitor today and will let you if this resolved it - next weekend

[poty]

Too enormous response! Check the solder joints of the resistors first!

[WGH]

In all likelihood your Cornet2 is just fine. Different types of rectifier tubes affect how long the LED stays red. You must be using a directly heated tube. The Cornet2 was designed to use a Sovtek 5Y3, which is indirectly heated and has a slow warm up time. NOS 5Y3 have a fast warm up. You can also use a 5Y3GT, 5AR4, or a 5V4GA (my favorite).

Wayne 

[Bill Epstein]

What Wayne said. My Sylvania 5Y3 goes green in about 2 seconds, the Sovtek 4 or 5.

[hagtech]

Indeed.  A "real" 5Y3 will light up very fast.  If you prefer slow, then use a 5AR4 or similar.

jh