• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • Notice: You may not use this site to facilitate the unauthorized selling of copyrighted material including, but not limited to, in the public dxForums, dxGallery, dxChat and private messsages. If you get caught doing this, you will be permanently banned with no second chances. A notice will be placed on the site of why you were banned and any information collected by this site about you will be made known to the copyright holder.

28 volts pills

johnnytek

New Member
Sep 5, 2021
9
5
3
82
  • Like
Reactions: Alexis Mercado

Naysayer

Member
Mar 6, 2020
12
10
13
New York
Motorola Engineering Bulletin EB-27A concerned 2x mrf422. It used 3T/22Ga Input and 3T/16Ga Output for the Impedance transformers. Down from typical 4T for the 2879. The article however, notes that the amp runs hot, extra cooling required.
 

SuperLid

Member
Feb 6, 2020
23
11
13
NY/NJ
Here is the modified 2SC2879 to MRF422 and a scrap 2SC2879 for comparison. I ended up with 4T input and output XFMR.

SL
 

Attachments

  • IMG_20220514_191241.jpg
    IMG_20220514_191241.jpg
    1.7 MB · Views: 17
  • IMG_20220514_191256.jpg
    IMG_20220514_191256.jpg
    1.7 MB · Views: 17
  • IMG_20220514_191607.jpg
    IMG_20220514_191607.jpg
    1.7 MB · Views: 17
  • IMG_20220514_191622.jpg
    IMG_20220514_191622.jpg
    2.1 MB · Views: 17

SuperLid

Member
Feb 6, 2020
23
11
13
NY/NJ
Here is the modified 2SC2879 to MRF422 and a scrap 2SC2879 for comparison. I ended up with 4T input and output XFMR.

SL
Alexis, if you have specific questions that I can answer, feel free. I will look at the amp and tell you what's going on there. This amp was built in the mid 90's and has not been used in decades. I am going to see how it works soon.
 
  • Like
Reactions: Alexis Mercado

dxChat
Help Users
  • No one is chatting at the moment.