Replacement for a Germanium Rectifier...?

[Lazarus Short]

I've been working on an old Phillips tube amp, and the rectifier is solid-state, but germanium. How do I determine what to replace it with? Will I just need to resort to soldering some diodes together, of some value or other? It's above my "pay grade" for sure...

 

[mlucitt]

Can you give us a P/N or a picture of the germanium rectifier?

 

[Gepetto]

It is probably a selenium rectifier. Has metal fins?

Replace it with a silicon bridge.

The selenium emits poison when they fail...

Selenium rectifiers had a shorter lifespan than desired. During catastrophic failure they produced significant quantities of malodorous and highly toxic fumes that let the repair technician know what the problem was. By far the most common failure mode was a progressive increase in forward resistance, increasing forward voltage drop and reducing the rectifier's efficiency. During the 1960s they began to be superseded by silicon rectifiers, which exhibited lower forward voltage drop, lower cost, and higher reliability.[6] They are still manufactured for exact replacement purposes, but are not designed into new equipment.

 

[Lazarus Short]

The unit is metal, with no fins that I can see and square, about 3/4 of an inch on the side. It is labeled as so:

B250C75
e-F1080
Made in Germany

Will any silicon bridge work, or do I need to tailor it to the amp?

 

[Gepetto]

The unit is metal, with no fins that I can see and square, about 3/4 of an inch on the side. It is labeled as so:

B250C75
e-F1080
Made in Germany

Will any silicon bridge work, or do I need to tailor it to the amp?

Does it look like this?

Vintage 1960s Grundig Rectifier for Tube Amplifier B250C75 35B0 | eBay

 

[Gepetto]

Or this?

B 250C75, Tube B250C75; Röhre B 250C75 ID56516, Solid State (radiomuseum.org)

 

[Gepetto]

Something like this will work fine

BR34 Rectron | Mouser

 

[Lazarus Short]

Does it look like this?

Vintage 1960s Grundig Rectifier for Tube Amplifier B250C75 35B0 | eBay

Except for "Grundig," it looks exactly like what I have.

 

[Lazarus Short]

Or this?

B 250C75, Tube B250C75; Röhre B 250C75 ID56516, Solid State (radiomuseum.org)

That one, not so much.

 

[Lazarus Short]

Something like this will work fine

BR34 Rectron | Mouser

Thanks, I'll try one...