PJ, converted your Paramounts to 6SN7 yet?

Paully · 3804

« previous next »
Pages: 1   Go Down

0 Members and 1 Guest are viewing this topic.

Offline Paully

  • Sr. Member
  • ****
    • Posts: 516
on: February 04, 2011, 09:20:56 AM
You may not even have converted your personal amps to the new board, much less gone over to 6SN7 from the 5670.  But when you do get around to it, I would be very interested to hear what your impressions are.


Offline Paul Joppa

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 5831
Reply #1 on: February 04, 2011, 09:54:28 AM
Halfway. My personal amps were a prototype for the new board (Ed's amps were the other prototype version; I got the one that sounded best and Ed was going to adopt the new board for his.

But I haven't swapped the sockets yet. The hardest part will be mechanical, replacing the 9-pin+hole shrinker with an octal socket. Then it's just solder the loose wires to the right pins and adjust the bias trimmer. I have a couple prototypes of other products to build first though, and I'm a slow and sloppy builder so it might take a while. (Also, my parafeed Auricaps are mounted like trucknuts and really ought to be tied down while I'm working on it. And I keep saying I'll deadbug a PEC pot as a gain control into these amps some day...)

Paul Joppa

Offline Paully

  • Sr. Member
  • ****
    • Posts: 516
Reply #2 on: February 04, 2011, 10:09:44 AM
Cool.  I ordered the new board and am going to use it with the 5670 first.  But I have bought so many 7N7 tubes (yes, I have a problem) that I am seriously considering converting them over to 6SN7 and then using an adapter to be able to use the 7N7 as well.  It will be a while before I am able to do that myself, but if you get around to it do post how it goes.  We'll see who gets to it first!  If it is just a pin-out change to the new socket, and I can ask Grainger about the bias trimmer, I may go ahead and have a shot at it once I am comfortable with the sound of the 5670.

I have some very large auricaps dangling from the bottom of my Paramounts as well.  Plus some teflons, and I want to put in some oilers in the power supply, and...


Offline johnsonad

  • Hero Member
  • *****
    • Posts: 1670
Reply #3 on: February 04, 2011, 11:27:58 AM
If you guys figure out a way to secure these monster Auricaps, let me know! 

Aaron Johnson

Offline Grainger49

  • Hero Member
  • *****
    • Posts: 7175
Reply #4 on: February 04, 2011, 12:40:29 PM
You can secure them by attaching a "stickey back" to the base and using a cable tie.  Stickey back is what I have always heard electricians call the square nylon attachment with an adhesive tape on back.  I have no idea what the real name is.


Offline Paul Joppa

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 5831
Reply #5 on: February 04, 2011, 03:09:50 PM
Yeah, that's the usual way. But then you can't take the amp out of the base without unsoldering the cap. And there's no room on the chassis plate - my caps are 2" diameter by 2.5" long!

Maybe I can screw a couple of them to standoffs on the 300B socket mounting screws. ... Grainger, I think you gave me a good idea!

Paul Joppa

Offline johnsonad

  • Hero Member
  • *****
    • Posts: 1670
Reply #6 on: February 04, 2011, 03:23:16 PM
I see where you're going with that PJ, great idea! 

Aaron Johnson

Offline Grainger49

  • Hero Member
  • *****
    • Posts: 7175
Reply #7 on: February 04, 2011, 04:11:53 PM
How about stickey backed Velcro?


Pages: 1   Go Up
« previous next »