That awesome glad you got ahold of Matt he has been very helpful to me I'm building his zebra wood spud amp as I speak also built his lacewood amp hope you enjoy the preamp I love mine keep up the good diy projects.

These voltages are at idle with a 12ax7 I'm in the middle of tweaking my kt88 so I can't set it up today .I have 2 other amps hooked up to other preamps so tomorrow I will hook up the kt88 and put a 1 kz signal and give you more information on

My voltages 295 at the 100 uf cap and 195 at the plate pin

It could be that you used a 470 ohm instead of a 470 k bleeder resister so your sending voltage to ground also if you used the 125 volt tap on the primary instead of the 115 volt your voltage will be lower but it looks like you used a 470 ohm in the photo hard to tell.

Hi speedy it could be that you used a 470 ohm bleeder resister instead of a 470 k resister so you are sending voltage to ground it looks like it's 470 ohms in the photo also the transformer has a 115 volt tap and a 125 tap if the 125 tap is used it will give you a lower voltage I used the 115 myself because in my house my power is 117 to 120 volts all the time hope this helps

I was thinking the same thing with a switch. Audio people say the less componits the better less is more but I'm with you audio is so subjective there's alot of opinions yours is the only one that really matters.

I'm also using a 12au7 new old stock RCA the 12ax7 seams to have to much gain I did put the bypass cap into the preamp maybe the 12ax7 would be better without the cap in play. But I'm impressed with it the way it is now. Also I use matched tubes in all my amps I'm building one hoping to incorporate RIAA into it for a turntable.I'm thinking a large chasis with separate places to keep noise out.and make it switchable inputs withe a sub out.

I use it on my cell and tablet hooked up to either my 6l6 lacewood amp from the same designer and my blueglow kt88 mark designed you can pick the gain from the 12a ? 7 you choose.

I used the 269 ex with no problems

IF YOUR INTERESTED IN BUILDING THIS PREAMP GO TO CASCADE TUBES . THERE IS EVERYTHING YOU WOULD WANT TO KNOW. THERE IS ALSO ALOT OF GREAT PHOTOS ON DIY AUDIO SITE. I HAVE BEEN IN CONTACT WITH THE BUILDER MATT FOR THIS PREAMP AND HIS LACEWOOD AMP HE IS A GREAT GUY HE HAS RESPONDED FAST TO MY Questions.

Thanks

I built this preamp and also built the lacewood amp both from the same designer I love both.I would love to add a sub out but don't have the curcuit