• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Marantz Model 25 transistor substitutions

B

bdondo

Active Member
I'm about to re-cap and possibly replace some transistors on a Marantz Model 25. It currently sounds fine, so I don't want to do anything unnecessary, but I'd like to replace any transistors that are known to be problematic. I've checked the Top Ten Worst Transistors list and don't see any of the Model 25 transistors listed, but I imagine there are a lot of transistors that are problematic but just didn't make the cut to be a "top ten" member.

Please let me know if any of the below are generally recommended to be replaced. I've searched a bit and some of them don't seem to be common in Marantz receivers (like 22xx series) but are found in Pioneer models.

Marantz Model 25 Transistor List
Phono Amp
2SC732-BL

Tone Amp
2SC732-BL
2SA494-Y

Main Amp
2SA562-O
2SC371-O
2SC497-R
2SA497-R

Power Supply
2SC373

FM-AM IF and MPX
2SC380-R
2SC380-O
2SC380-Y
2SC373
2SC373 Gn
2SC644-S

FM-AM Front Assy
2SC3710
2SC371R

I left out some 2SK* FETs because the recommendation seems to be to leave them in unless they're bad.

Thanks!
 
Register to hide this ad
Perfect timing !
I'm getting ready to do a 24 tuner myself.
Enjoy , and take your time nice little unit.
 
You must log in or register to reply here.
Back
Top Bottom