Jump to content
The Klipsch Audio Community
CANT

EICO ST-40 Question

Recommended Posts

I recently picked one of these up without tubes (for cheap) and was planning on running through it this weekend if I have time...

 

My question is related to the 7247/12DW7's... I don't have any... but I do have AX's, AT's and AU's... what is my best choice for a sub for testing purposes? I've looked around online for help but many/most of the info I can find tends to lead to privately hosted links that are long dead. 

 

Side notes: My love of old switches and pots lives on (sarcasm) so expect most of them to be removed. I did located a gentleman who removed the tone control function (see ST40-mod-A4) though he left the Hi and Lo filter switches that I have no desire to use. This this amp is definitely no show pony so I am unconcerned with keeping it original. 

 

Thanks again for any help you can provide

EICO ST40.JPG

ST40-mod-A4.png

Share this post


Link to post
Share on other sites
22 hours ago, CANT said:

I recently picked one of these up without tubes (for cheap) and was planning on running through it this weekend if I have time...

 

My question is related to the 7247/12DW7's... I don't have any... but I do have AX's, AT's and AU's... what is my best choice for a sub for testing purposes? I've looked around online for help but many/most of the info I can find tends to lead to privately hosted links that are long dead.

 

It probably depends what you mean by "for testing purposes."  The pinout is the same as 12AX7 or 12AU7, but the 12DW7 is a funny hybrid, with two unequal triode sections; one has a lot more gain than the other.  You won't get fireworks if you try 12AX7 or 12AU7, but it may only give a rough idea of how it's working. 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...