Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

update....





Decided to try an 845 first as I have a schematic for it as posted. Amazing what a difference that made. I had it up and running in about 20 minutes on the new bread board. Now this is a long ways from a finished design, I just wanted to see if I could get something working. It actually sounds pretty good. I just did the one channel for now and used a mono source. I took some measurements just to see where I am and I know things will need adjustment. You can read some of them on the schem, but just in case you can't...

B+ 500vdc
plate volts (filament to plate 370 vdc)
cath to grnd - grid to grnd (117-98= 19vdc)
plate current 64 mA (115vdc/1800 ohms)

Now I know I still would have to do a lot of work on this to get it where it should be (62mA and -51vdc grid volts), but my real question for now is should I be able to replace the 845 with an 813 an get music out the other end? I think that is what I did before, but I have no record of what I changed to get it to work.


This post is made possible by the generous support of people like you and our sponsors:
  K&K Audio / Lundahl Transformers   [ K&K Audio / Lundahl Transformers Forum ]


Follow Ups Full Thread
Follow Ups

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.