• 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

Not another 10D1 & 10D2 substitution question

Dom123

Dom123

Well-Known Member
Hi Everyone,

I know the recommended sub is the 200V 2A sub 1N5393, but I want to place a small order at Reichelt, who don't stock this item, but stock numerous 2A alternatives.

Background, I just bought a non working AU-5900, and upon investigation found one 1A fuse blown (F604), and a couple of 10D1 rectifier diodes burnt. Even though the parts manual lists 10-D2, all diodes installed were 10-D1's which I believe are 1.5A rating. Also someone had wrapped wire externally around the 1A fuses !

Anyhow after changing out the burnt diodes for some 1N4004, and fixing some cold solders on the F-2596 board, the amp works fine, so a pretty cheap repair.

My question can the 1A diodes stay or should I put 2A diodes. Some alternatives Reichelt have are MUR240 & BY297-200. Are these suitable ?

I now have a wall of AU-X900 series amp from AU-3900 upto AU-7900. Can't get round to parting with any of them. My painpoint is the slight hum on the AU-7900 which I can't seem to get rid of. It originates from the pre-amp somewhere. All caps & transitors are new. I going to swap out the rectifier diodes to see if this helps.
 
Register to hide this ad
Dom123 said:
Hi Everyone,

I know the recommended sub is the 200V 2A sub 1N5393, but I want to place a small order at Reichelt, who don't stock this item, but stock numerous 2A alternatives.

Background, I just bought a non working AU-5900, and upon investigation found one 1A fuse blown (F604), and a couple of 10D1 rectifier diodes burnt. Even though the parts manual lists 10-D2, all diodes installed were 10-D1's which I believe are 1.5A rating. Also someone had wrapped wire externally around the 1A fuses !

Anyhow after changing out the burnt diodes for some 1N4004, and fixing some cold solders on the F-2596 board, the amp works fine, so a pretty cheap repair.

My question can the 1A diodes stay or should I put 2A diodes. Some alternatives Reichelt have are MUR240 & BY297-200. Are these suitable ?

I now have a wall of AU-X900 series amp from AU-3900 upto AU-7900. Can't get round to parting with any of them. My painpoint is the slight hum on the AU-7900 which I can't seem to get rid of. It originates from the pre-amp somewhere. All caps & transitors are new. I going to swap out the rectifier diodes to see if this helps.
Click to expand...
The MUR are "Ultra-Fast" recovery. The BY are "fast recovery". I'd go with the "fast" since "ultra-fast" really isn't beneficial in this case. In fact could be detrimental depending on the circuit design. 2A will be fine either way. Putting 1A in place of 1.5A is riding on the edge.
 
Thanks everyone for your answers. As I only wanted to make a small order, I was thinking of using Reichelt in Germany, who have reasonable shipping cost for small orders, but unfortunately they dont stock the SBYV27-200 from Vishay.

They have BYV 27-200 from Vishay, which is described as an ultrafast sintered glass diode
They also have a BY297-200 from TSC (Taiwan semiconductor) which has similar spec, but a Vf of 1.2V instead of 0.88V for the SBYV27-200E3.
Otherwise they have 1N5402, but these seem physically quite big for the board and the wire diameter looks thick.

Alternatively I just place a bigger order for stufff from Mouser in order to get free shipment........

BTW, concerning Nichicon capacitors, what is the most recommended model type for capacitors in the signal path (>3.3uF) ?
Generally I have been using Panasonic FC's , and are happy, but just wondering if there are any argument to use Nichicon
 
You must log in or register to reply here.
Back
Top Bottom