28 volts pills

[johnnytek]

Hi. I am looking for 28 volts pills. What number should they be ? I am planing to replace my 4 pills 2SC2879 for ones rated at 28 volts. Any suggestions ?

BLW97 transistor Datasheet pdf - power transistor. Equivalent, Catalog

NXP BLW97 | transistor. DISCRETE SEMICONDUCTORS DATA SHEET BLW97 HF power transistor Product specification August 1986 Phi.

datasheetspdf.com

 

[Naysayer]

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]

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.

EB-27A is the bulletin to follow for this exercise.

 

[SuperLid]

Here is the modified 2SC2879 to MRF422 and a scrap 2SC2879 for comparison. I ended up with 4T input and output XFMR.

SL

 

[SuperLid]

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.