collapse

Author Topic: Parallel input stage idea - 1/2 12AX7 ll LND150 ?  (Read 489 times)

Stephenl

  • Chipper
  • *
  • Posts: 2
  • Chip Points: 0
    • View Profile
Parallel input stage idea - 1/2 12AX7 ll LND150 ?
« on: April 19, 2018, 09:22:54 AM »
I was thinking of trying this, but I don't have a lot of experience using FETs. I'd like to try the conventional arrangement of common Anode and Cathode resistors...but I'm guessing the LND150 will need something different for biasing.

Thanks in advance for any education on this.

J M Fahey

  • SSGuitar Global Mod
  • Legendary
  • ****
  • Posts: 4141
  • Chip Points: 429
    • View Profile
Re: Parallel input stage idea - 1/2 12AX7 ll LND150 ?
« Reply #1 on: April 19, 2018, 04:23:48 PM »
They are very different, biasing will drive you crazy.
I would build 2 independent gain stages, each biased properly, join inputs and use a couple mixing resistors to mix outputs, say 2 x 100k or 220k.
Or use a 500k linear "blend"  pot and you can pan from one to the other or get both same level when set to the middle.

 

* User Controls

 
 
Welcome, Guest. Please login or register.
Did you miss your activation email?

* Recent Posts

Power transformer questions by Loudthud
[Today at 03:53:31 PM]


noisy preamp by cbg Rick
[Today at 10:50:58 AM]


Ampeg SVT450 by Jazz P Bass
[February 15, 2019, 11:18:15 AM]


Another Hohner Electric Piano - Cembalet CF by aruption
[February 14, 2019, 07:16:16 AM]


Amp repair?! by Dimi Pana
[February 13, 2019, 12:11:30 AM]

* Sponsors