Home Tube DIY Asylum

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

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]
[ Alert Moderator ]

Two Questions

You say: "Notice that the plate resistors in this circuit have a much lower value (33K versus 100K) than in the other circuit - this will lower the output impedance, which is a good thing when driving a DHT".

If I only have about 300v B+, can I omit the plate resistors entirely or put in a much lower nominal value (like 1k) and still have the lower output impedance? Or does this create some other problem?

Also: "a dissadvantage of the Eico LTP circuit is that it requires a 'pre driver' - the ECC83. Notice that the grids of the 6SN7 are DC coupled to the plate of the ECC83, and sit at +120 volts."

Yes and I'd like to eliminate that tube. Is this possible? Does the 120v have to come from a 'pre-driver' tube or can it be supplied from a cap in the PS and have the input signal come from the normal RCA jacks? Maybe (probably!) a stupid question, but I'm trying to learn :^)

Thanks . . . Charlie

This post is made possible by the generous support of people like you and our sponsors:
  Atma-Sphere Music Systems, Inc.  

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.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]