Home OTL Asylum

OTL, Output Transformerless Amplifier User Group.

RE: GRAAF GM 200

Unfortunately choosing tubes from one manufacturer (e.g. RCA or Mullard) does not always work, unless they are made by the same factory, as there are multiple physical designs of the PL504 tubes that are sold by a single manufacturer. As an example, have a look at some Mullard tubes and you will see that those made in the UK have a getter (silver ring at the top of the tube) that is oriented vertically, while those made in Holland are horizontal.

You want to try and get tubes from the same manufacturer and manufactured in the same way (e.g. all Japanese manufactured RCAs are made the same way, as far as I know).


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
  • RE: GRAAF GM 200 - Mark S Allen 22:28:40 08/14/15 (0)

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.